TempReach USA connects Louisville homeowners with independent local HVAC technicians. This page is built from the metro's own Census housing data, ZIP codes and climate record — the heating and cooling problems described here are the ones Louisville homes actually have.
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The median Louisville home was built in 1977; 54.4% of the stock predates 1980, and the pattern this metro's own data ranks first is the refrigerant transition reaching older systems. TempReach USA is a referral service, not an HVAC company: one call connects you with an independent local HVAC technician serving your ZIP code.
Start with the raw material: 1,361,847 people, 597,784 housing units, and a housing stock whose middle home was built in 1977. That single date organises everything on this page. On one side of it stand the older districts — 28.4% of homes predate 1960, 54.4% predate 1980 — heated and cooled by systems renewed in pieces for decades, in homes across Clark, Floyd, Harrison, Washington, Bullitt, Henry, Jefferson, Meade, Nelson, Oldham, Shelby, Spencer. On the other side, the 23.0% built since 2000 run matched modern equipment, and fail in the newer ways. A Louisville technician reads a home's build year the way a doctor reads a chart: it predicts, before a single panel is opened, which systems deserve suspicion first.
The pre-1980 stock is where most of the metro's HVAC character lives. Homes from those decades in Clark County and across Clark, Floyd, Harrison, Washington, Bullitt, Henry, Jefferson, Meade, Nelson, Oldham, Shelby, Spencer were built with duct layouts from the first age of central systems, furnaces and condensers that have since been renewed piecemeal, and insulation standards from another era, and each of those choices is now at or beyond the age its makers expected of it. Owner-occupiers hold 68.6% of the metro's homes, so most of the people reading this page are reading about a system they own outright — one whose failures arrive as surprises only if nobody has looked at the pattern: cooling fading a little each summer, a furnace recovering a little more slowly, one room drifting a little further from the thermostat.
Uniformity is the newer stock's defining trait. A subdivision in Jeffersonville or New Albany went up in a handful of years, fitted with one generation of equipment, one duct design, one thermostat class. That uniformity writes a calendar the whole street shares: the first heating wave, the first cooling wave, the first questions about refrigerant and charge arrive together, years before the same streets need anything structural. With 23.0% of the metro built since 2000, that calendar governs a large and growing share of Louisville's HVAC work — predictable work, if a household reads the calendar early.
One more record sits over the whole metro, and it is the one the equipment itself keeps: the weather's. LOUISVILLE BOWMAN FLD, KY US logs 48.12 inches of precipitation in an average year and swings between 38.1 days at 90 degrees or more and 79.9 nights at or below freezing. Heating systems ride that swing in their run hours; cooling systems ride it in their cycle counts; ducts ride it in the attics, expanding and contracting between the seasons. Cross the swing with the housing ages above and the selection of problems further down this page stops looking like a list and starts looking like an arithmetic result.
Housing eras and climate, joined — the two datasets every section of this page is built from.
Lay the eras side by side instead: 28.4% pre-1960 (169,771 homes), 26.0% from 1960-1979 (155,424), 22.7% from 1980-1999 (135,697), and 23.0% since 2000 (137,490). No single era tells the story — the proportions among them do, and those proportions are different in every metro this site covers.
This is, by the numbers, an old-system metro. The largest slice of its housing predates 1960, which means the typical serious job here involves equipment generations in their final chapters: ducts that leak by modern standards, furnaces renewed into them more than once, cooling added decades after the houses were built for heat alone. The newer bands exist — the growth since 2000 is real — but they are the supporting cast. Louisville's HVAC identity was fixed by its earliest builders, and its problem list is written in their floor plans.
Close behind the leader come the 1960-1979 homes, 26.0% of the stock. Their systems are mid-change by construction — the decades when cooling spread mid-stream — so this band is where a Louisville technician earns the diagnostic fee: airflow readings and pressure tests that say which side of the transition a given house was built on.
Start the climate half where the system starts: at the thermostat's two seasons. Louisville's cooling answers 1,543 cooling degree days of load and its heating answers 4,151 heating degree days of cold at LOUISVILLE BOWMAN FLD, KY US — an average temperature of 57.8 degrees that no individual week actually delivers. A heating and cooling system here is never in neutral; the record keeps it working at one end or the other all year.
That is the whole method of this page in one section: era shares from the Census, loads from NOAA, and a problem list that is simply where the two overlap most in Louisville. The services and guidance that follow are ordered by the same profile — local first, generic last.
Ordered by what this metro's data says its homes need most.
The local professional you are connected with reads the system the way it fails: electrical values first, then temperatures and pressures, then airflow, until one finding explains all of the symptoms at once.
One more pattern belongs in the Louisville picture: repair calls here are also a refrigerant story. Systems fitted in the older decades run on refrigerant generations the industry has been retiring, and every repair on those units weighs the charge's scarcity against the system's remaining life. The technician who explains that arithmetic plainly — what the repair restores, what it cannot assure anyone about next summer — is giving the household the real choice, and in the 325,194 pre-1980 homes it is a conversation held weekly. The LOUISVILLE BOWMAN FLD, KY US record — 4,151 heating degree days, 1,543 cooling — is the backdrop Clark County technicians plan around.
Count the exposure from the Census side: a median build year of 1977 across 597,784 housing units means half the metro's air conditioners are older than the systems in the growth suburbs around Jeffersonville, and summer runtime is the statistic that matters — the repair calls follow it street by street.
Where this service gets booked in Louisville follows the map on this page: the older districts generate the deep-end work, the post-2000 subdivisions the wear-and-tear work, and the 135,697 homes in between split the difference. Telling the call center your home's build decade — most Louisville owners know it within a few years — puts the right kit on the van the first time.
Post-renovation is the clearest case in the trade. Drywall dust and sanding residue settle through every open register, and one thorough cleaning after the work ends removes in hours what the system would otherwise circulate for years.
A word on timing, since Louisville households ask: duct cleaning earns its appointment when the evidence calls for it — after construction or renovation dust, when a home changes hands after years of one household's accumulation, when the registers show visible load or the blower compartment tells the story. Booked on evidence, it is honest work with visible results. Booked on a calendar superstition, it is a van ride. Local technicians who work from the evidence are the ones this page's routing favours, in Louisville/Jefferson County metro government (balance) and across the metro alike. It is why two Louisville homes of the same age, on different streets, so often need the same visit in the same year.
Count the systems and the diary fills itself: 550,423 households breathing through ductwork daily, the oldest of it in homes from the 1970s and the newest in the subdivisions past Jeffersontown. What the cleaning finds follows the biography — dust in proportion to years, debris in proportion to renovations.
One local habit worth copying: Louisville homeowners who mention their street's building era when they book get a better-matched visit, because a technician heading to a the 1970s home in Clark County loads different parts than one heading to a new-build subdivision in Jeffersonville. The service is the same; the preparation is local.
A tune-up is scheduled while the system still works, which is the entire point: measurements taken in mild weather find the parts that hard weather would have found instead, at its own chosen hour.
Maintenance also has a paperwork virtue in Louisville: the recorded visit. Readings dated season by season — refrigerant pressures, temperature splits, capacitor values, the exchanger's noted condition — turn a system's decline from a surprise into a schedule. Households across Clark, Floyd, Harrison, Washington, Bullitt, Henry, Jefferson, Meade, Nelson, Oldham, Shelby, Spencer who keep those records meet replacements as appointments, and the technicians who write them are leaving the next visit, whoever makes it, a map of the system's life. In a metro of this size, that map is most of what local knowledge means. In Louisville that holds across 117 ZIP codes, from Louisville/Jefferson County metro government (balance) out to New Albany.
Tune-up demand follows the fleet's waves: the subdivisions' matched systems reaching service points together, the pre-1980 districts' individual units on individual schedules. Mount Washington sits inside one of those patterns; the readings taken there this season predict its systems' next one.
In Louisville this service is booked most often through the problem patterns at the top of this page — the metro's housing data, not habit, sets the order. If your home is in the 54.4% built before 1980, mention its age on the call: it changes the parts the technician loads before heading to Louisville/Jefferson County metro government (balance) and the rest of the metro.
The MERV number is a match, not a score. The right filter figure is the highest the blower and ducts can pull air through without strain or bypass — chosen for the furnace in the basement, not the shelf in the store.
The air quality conversation in Louisville starts with humidity more often than with gadgets. A home whose summer indoor humidity rides high grows musty at the coil and uncomfortable at the thermostat, and a home dried out by 4,151 heating degree days of winter runtime irritates skin, wood and sinuses in the opposite direction. The assessment measures before it prescribes: humidity in both seasons, the filter's actual condition and fit, the duct leakage that pulls attic or crawl-space air into the supply stream in the metro's older districts. Locally the workload concentrates where the stock is oldest — the districts built around the 1970s first.
Air quality demand in this metro is written by its sealed seasons: 38.1 hot days with the windows shut around the cooling, 79.9 freezing nights with them shut around the heat. The 137,490 post-2000 homes hold their air tightest; the older districts around Shelbyville exchange theirs with attics and crawl spaces.
Where this service gets booked in Louisville follows the map on this page: the older districts generate the deep-end work, the post-2000 subdivisions the wear-and-tear work, and the 135,697 homes in between split the difference. Telling the call center your home's build decade — most Louisville owners know it within a few years — puts the right kit on the van the first time.
A furnace announces its fault by where its startup sequence stops — inducer, ignition, flame proving or blower — and Louisville technicians diagnose by watching that sequence, not by replacing parts in a hopeful order.
Read Louisville's furnace calls as a census and they mirror the housing: the the 1970s districts produce the exchanger and ignition work on equipment in its second or third decade; the growth subdivisions produce the control-board and sensor faults of newer, more electronic systems. Both are furnace repair, but they are different trades inside one name — which is why the technician's first questions here are about the home's age and the unit's, before a single panel comes off. Ask in Jeffersontown and the answer rhymes with Louisville/Jefferson County metro government (balance): same eras, same equipment generations, same calendar of failures.
Heating demand in Louisville concentrates where the cold does its work: 79.9 nights a year at or below freezing, against a housing stock whose median build year is 1977. Around Shepherdsville as in the old core, that combination is not an abstraction — it is the street's furnaces, house by house.
In Louisville this service is booked most often through the problem patterns at the top of this page — the metro's housing data, not habit, sets the order. If your home is in the 54.4% built before 1980, mention its age on the call: it changes the parts the technician loads before heading to Louisville/Jefferson County metro government (balance) and the rest of the metro.
Replacement in Louisville begins with a load calculation across Clark, Floyd, Harrison, Washington, Bullitt, Henry, Jefferson, Meade, Nelson, Oldham, Shelby, Spencer: the independent local professional measures the home — not the old unit's label — and quotes the full scope before work begins.
Heating installation in Louisville starts with a heat-loss calculation across Clark, Floyd, Harrison, Washington, Bullitt, Henry, Jefferson, Meade, Nelson, Oldham, Shelby, Spencer: the independent local professional measures the home's loss, inspects ducts and venting, and quotes the full scope before work begins.
From Louisville/Jefferson County metro government (balance) to Jeffersontown, Louisville heat pump calls through TempReach USA reach a local professional who explains findings plainly and quotes after assessing — in the heating season and the cooling season alike.
Ductless installation in Louisville is surveyed room by room across Clark, Floyd, Harrison, Washington, Bullitt, Henry, Jefferson, Meade, Nelson, Oldham, Shelby, Spencer: the independent local professional calculates each space's load, plans line and drain routes, and quotes the complete design before work begins.
In Louisville, the thermostat question splits by housing era: homes from around the median build year of 1977 often lack a common wire in the wall, while newer builds across the 117 covered ZIP codes usually carry one — the local professional checks the cable before choosing the control.
One call from anywhere in Louisville's 117 covered ZIP codes reaches the routing: the failure's details taken, safety advice given on the spot, and the visit sequenced the same way everywhere — safety, stabilization, diagnosis, then repair or an honest scope.
In Louisville, commercial work follows the stock: 597,784 housing units' worth of mixed buildings — offices, retail and restaurants from Louisville/Jefferson County metro government (balance) across the 117 covered ZIP codes — each with rooftop units whose service rhythm the local professional sets per building.
Two patterns generate most of the bookings behind the services above: The refrigerant transition reaching older systems and leaky ducts losing air and energy. That is why the order of this page's service list is what it is — the services answering those patterns come early, and the rest follow in the order the metro's data supports. A homeowner whose home matches the local profile — built in the metro's big decades, in one of its older districts — is, statistically, reading their own shortlist.
Ranked for this metro alone, from its Census housing profile and NOAA climate record.
Leaks are where the transition stops being abstract. A slow leak on a current-generation system is an ordinary repair story: find it, fix it, recharge. The same leak on an R-22 system in Louisville opens a ledger. The refrigerant itself is drawn from a shrinking reclaimed supply; the system is, by definition, of an age where the leak may not be its last; and the money spent returning it to service buys time on a machine whose other components have aged alongside it. None of that decides the answer by itself — plenty of R-22 systems justify a repair and serve well afterward — but it changes the questions: how old is the unit, where is the leak, what else is worn, and what would the same money mean applied to a current-generation replacement? Households that ask those four questions with the numbers in front of them make the decision once; households that skip them often make it repeatedly, one hot season at a time.
The mechanics underneath the policy are simple. A refrigerant is the working fluid of the cooling cycle: it evaporates indoors to absorb heat and condenses outdoors to release it, thousands of times a season. Each generation of fluid was engineered to improve on the last one's environmental profile and operating pressures, and each required its own hardware — compressors built for different pressures, oils that mix with one fluid and not another, metering set for one fluid's characteristics. That is why the generations cannot be swapped like brands of the same product, and why 'topping up' an older system always means its own fluid, sourced from whatever supply its generation still commands. In Louisville, where systems from all three generations stand in neighboring yards, the diversity is a service reality: diagnosis begins with identification, because the same symptom — a system low on charge — carries three different expense structures depending on the nameplate.
The climate loads the stakes: a leaking system in Louisville underperforms through 38.1 days a year at 90 degrees or more at LOUISVILLE BOWMAN FLD, KY US, so the household pays the transition's toll twice — in refrigerant and in lost cooling — until the underlying decision is made.
Renovation writes its own chapter in this pattern. Homes in Louisville have been extended, finished and re-divided for decades — a garage converted, a basement finished, an addition tied into ductwork sized for the original house. Each alteration borrows air from the existing network, and the borrowing is rarely repaid with new capacity or rebalanced runs. The result is a duct system whose map no longer matches the house it serves: original rooms over-supplied, added rooms fed by a hopeful tap into a trunk that was never asked to carry them. Add the slow leaks of age on top of the redesigns of renovation, and the far rooms' complaints stop being mysterious. The remedy starts with honesty about the map — what was designed, what was improvised, and what each run can actually deliver — before any cleaning, sealing or resizing is worth doing.
The construction details explain the timeline. Duct joints are mechanical connections, and the sealants asked to make them permanent have finite lives: cloth-backed tape dries and releases, foil tape lifts at edges, and even mastic can crack where runs move with the building. Flex duct, common in the metro's later building decades, fails at its connections and where its inner liner is pierced or crushed — and a crushed section quietly throttles every room downstream of it. Meanwhile the spaces the ducts cross work against them: attic temperatures in a Louisville summer turn an uninsulated or leaking run into a heat exchanger pointed the wrong way, and winter reverses the argument in the crawl space. A duct system is therefore not a fixed asset but a slowly changing one, and its delivered performance in any given year is an empirical question, not a memory of its installation day.
The housing numbers frame the exposure: 597,784 housing units in Louisville, a median build year of 1977, and duct networks installed era by era in attics, crawl spaces and wall cavities. Every one of those networks is a set of joints ageing in the dark — the loss pool is the size of the metro itself.
The oldest systems in Louisville carry one more complication: their supporting cast is old too. Ductwork sized for an earlier furnace, refrigerant lines run for a refrigerant generation that has since been phased down, thermostats wired before communicating controls existed, electrical panels with no spare capacity for a modern system's starting load. Ageing, in an older home, is a property of the whole installation rather than a single appliance. That is why the honest maintenance conversation in an the 1970s home ranges wider than the nameplate: the machine, its air path, its refrigerant generation and its controls are ageing on four clocks at once, and the visit that checks all four is the one that predicts the year rather than reacting to it.
The mechanics of ageing are unglamorous and cumulative. Bearings wear and draw more current. Capacitor values drift downward year by year, weakening every start they assist. Coil surfaces oxidize and foul, shedding their ability to exchange heat a fraction at a time. Refrigerant leaves through seals and joints at a pace too small to notice in a season and large enough to matter in five. Electrical connections loosen under thermal cycling and add resistance that becomes heat. None of these processes stops, but most of them are measurable long before they are fatal — which is precisely what separates maintenance from repair. A tune-up measures the drift; a repair replaces whatever the drift finally claimed. The household that buys measurement regularly buys the choice of when to spend on renewal, and that choice is worth the most on the oldest equipment.
Climate presses the point. A system in Louisville works both ends of the year — 4,151 heating degree days against 1,543 cooling degree days at LOUISVILLE BOWMAN FLD, KY US — so its components accumulate in twelve months the wear a single-season climate would spread over two years.
Ask where a home's humidity actually comes from and the answers are a census of ordinary life: showers, cooking, laundry, breathing, houseplants, a damp crawl space exhaling through the floor, rain finding the grade against the foundation. In Louisville the outdoor air itself joins the census for much of the year, entering through every leak in the envelope and every return-duct path that crosses a humid space. The air conditioner is expected to process the sum of it. That expectation is reasonable only when the system's drying capacity is matched to the load — and the load is a property of the house and its climate together, which is why two identical systems on the same street can leave one house crisp and another sticky: the houses are importing different amounts of water, and only one system's setup accounts for it.
Judge a home's moisture by its wettest week, not its average one. Averages flatter: in Louisville, an average year at LOUISVILLE BOWMAN FLD, KY US delivers 48.12 inches of rain, but the burden arrives in episodes — the saturated stretch when the ground is wet, the air is wet, and the house's every surface is trading moisture with both. In that week the closet smells, the registers sweat, and the system's drying margin is audited honestly. The homes that pass the audit share a profile rather than a product: sources managed, a system sized and set up to run long enough to dry, a drain that carries the evidence away, and occupants who read indoor humidity the way they read temperature. Moisture problems are patient; they wait for the wet week. The preparation that defeats them is exactly as patient, and considerably cheaper in attention than in consequence.
Count the load the way the coil experiences it: through the humid months, each pass of indoor air delivers moisture that must condense and drain before the air can feel finished. In Louisville, where cooling degree days reach 1,543 a year, that invisible water work rivals the temperature work the system was named for.
Winter examines a furnace the way a long journey examines an older car: not with one dramatic test, but with sustained demand that finds every tired component in turn. In Louisville, the examination runs for months — 4,151 heating degree days of it — and the components sit it in order of their wear. Igniters, which glow and cool with every cycle, are the classic first casualty of a long season. Motors follow, their bearings carrying the season's hours. What surprises households is the clustering: a furnace that needed nothing for years can ask for two repairs in one hard winter, not because the first repair failed, but because the cold is auditing the whole machine at once and reporting its findings in sequence.
Judge a furnace by its coldest week, not its kindest. In its coldest week a Louisville furnace shows its true condition: whether it lights first time every time, whether it holds the house through the night without the temperature sagging, whether its sounds are the sounds it made when it was younger. LOUISVILLE BOWMAN FLD, KY US's record — 79.9 freezing nights in an average year — makes the examination annual and unsparing. Households that come through it without drama have usually done one unglamorous thing: they treated the autumn symptoms as the season's advance copy. A furnace rarely fails without having filed its intentions first, in a slower start, a louder cycle, a room that stopped keeping up. The winter merely publishes what the furnace had already written.
Count the duty rather than the drama: a Louisville furnace fires through 4,151 heating degree days a season, cycling its igniter and swinging its heat exchanger with every call. The wear that surfaces in January was purchased, cycle by cycle, in the seasons before it.
What the shoulders reward is a habit of finishing seasons properly. The last cold week is the time to note the heating system's report card while it is still legible; the last hot week, the cooling system's. Between them sits a window — mild days, an unhurried diary for local technicians, a system that can be opened and tested without the household depending on it that night — that neither deep season gives. In Louisville that window opens twice a year on a climate of 38.1 hot days and 79.9 freezing nights, and the households that use it convert the two most failure-prone transitions of the year into the two calmest appointments on their calendar.
The season loads Louisville's systems the way its record at LOUISVILLE BOWMAN FLD, KY US says it will: 4,151 heating degree days against 1,543 cooling degree days in an average year, against a housing stock whose median build year is 1977. The households that read the season early — filters, drains, a system run before the extreme weeks — are the ones whose calls stay schedulable.
In Louisville the transition's map is the housing map, lagged by one equipment generation. The districts built around Louisville/Jefferson County metro government (balance) and the the 1970s streets hold the metro's R-22 veterans, in homes that have already seen one full cycle of this story when the equipment before them was young. The middle suburbs hold the R-410A majority. The 137,490 homes built since 2000 carry early current-generation systems now reaching the age where their first major repairs will be quoted — into a market whose standard has already moved on again. Read as a whole, the metro's 597,784 housing units contain the refrigerant industry's last several decades standing in rows, and the service economy of the metro is, in part, the business of keeping all those decades running at once. The deep pattern for a homeowner is simple to state and slow to change: your system's generation is a property of your street's building era, and its implications were installed with the house.
The numbers underneath it, for Louisville: 597,784 housing units, a median build year of 1977, and a climate record at LOUISVILLE BOWMAN FLD, KY US of 4,151 heating degree days against 1,543 cooling degree days. Cross the housing record with the weather record and this pattern is what falls out at the top — rarely the most dramatic problem in heating and cooling, but the one this metro's stock and climate manufacture most steadily.
On a first visit for this pattern, a local technician's checks run in a practised order:
PROBLEM
SOLUTIONPopulation 627,210
Population 50,176
Population 37,589
Population 28,988
Population 22,121
Population 18,228
Population 17,491
Population 17,436
Population 15,556
Population 14,351
Population 13,673
Population 10,956
Also in the Louisville metro: Sellersburg (population 10,215), La Grange (population 10,188).
The communities in the grid are not suburbs of the page; they are its subject as much as Louisville/Jefferson County metro government (balance) is. Jeffersonville (50,176 residents) and New Albany (37,589) carry their own building decades, their own equipment generations and their own positions in the problem ranking's logic — a system under a Jeffersonville roof answers to the same data as one in the centre, but to a different era of it. Coverage here is defined by the ZIP list below; understanding is defined street by street, and this page's figures are the metro-wide version of a story each community tells in its own numbers.
Beyond the largest communities sit Jeffersontown (28,988), Clarksville (22,121), Mount Washington (18,228), St. Matthews (17,491), Shelbyville (17,436) — smaller places across Clark, Floyd, Harrison, Washington, Bullitt, Henry, Jefferson, Meade, Nelson, Oldham, Shelby, Spencer, covered on the same terms. Their housing tends to be older on average than the big suburbs', and their calls follow the older patterns on this page. One routing covers them all: find your ZIP code below and the rest is a phone call.
The metro's weight is not evenly spread. Louisville/Jefferson County metro government (balance) holds 627,210 of the 1,361,847 residents; Jeffersonville and New Albany add 50,176 and 37,589; and the remainder scatters across the smaller places above, some no bigger than a few thousand people. HVAC follows the weight — most calls come from where most homes are — but era matters more than size: a small community of 1960s housing generates older-system work than a large new subdivision does.
The metro answers to 12 county governments (Clark, Floyd, Harrison, Washington, Bullitt, Henry, Jefferson, Meade, Nelson, Oldham, Shelby, Spencer), a patchwork that matters at permit time rather than at the thermostat. Clark County carries the centre; the others carry the growth rings and the older outlying towns. A technician routed through this page works inside that patchwork daily — the weather does not care about the boundaries, but the job's paperwork does.
Beyond the metro line, the nearest covered metros are Lexington, KY (67 miles away), Bowling Green, KY (90 miles) and Cincinnati, OH (82 miles) — separate pages, separate profiles, because their housing and weather records are their own. Homeowners near the boundary sit between two datasets; the ZIP list above, not the map's edge, decides which page was written about your stock.
Set Louisville among its neighbours and the contrasts sharpen the profile: Lexington, KY — metro population 535,174, median build year 1985 — sits 67 miles away; Bowling Green, KY (197,180, median 1991) 90 miles; Cincinnati, OH (2,312,858, median 1975) 82 miles. Three different housing stocks under three nearby skies, which is why each keeps its own page and its own problem ranking rather than borrowing this one.
Divide the stock by the map and the densities appear: roughly 5,109 housing units for every covered ZIP code, 45,869 households to a county, 14 named communities in the grid. The balance between the generations reads 2.4 pre-1980 homes for every home built since 2000 — a single ratio that quietly predicts whether a metro's HVAC week leans toward renewal work in the old districts or first-generation upkeep in the new ones.
Louisville by the derived numbers — median home age 49 years · owners in 377,590 homes, renters in 172,833 · each covered ZIP code carrying about 1,451 pre-1960 homes · a heating-to-cooling degree-day ratio of 2.69 · 1,222 mm average annual rainfall.
County pages carry the local detail — land area, climate normals and the heating and cooling pressures on the ground in each county.
More plain-language help: the TempReach USA heating & cooling guides
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