This is Ann Arbor's heating and cooling page, built from Ann Arbor's own numbers: Census housing figures, the metro's ZIP codes and its NOAA climate record. TempReach USA routes your call to an independent local HVAC technician; the homework below is here so you know your home's likely problems before you ever make it.
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The median Ann Arbor home was built in 1978; 52.9% 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.
Read Ann Arbor through its counties and the picture sharpens. Washtenaw were not built in the same decades or for the same households, and their heating and cooling carries those differences: an older core where 25.2% of the metro's homes predate 1960, growth corridors where the subdivisions arrived in waves, and edges still being built out. The metro-wide medians — a middle home built in 1978, 158,115 housing units in all — are the average of those local stories, and the sections below are organised by the patterns the combined record produces, from the oldest equipment generations to the newest failure modes.
Stand in one of Ann Arbor's older neighbourhoods and you are standing in its HVAC's back catalogue. The homes there — part of the 83,643 built before 1980 across this metro — went up when a furnace was built to serve for a generation and central cooling was still spreading street by street. That generation has now elapsed several times over. What it leaves behind is not universal failure but universal exposure: every duct joint, igniter and condenser coil in those districts is operating past the horizon its makers planned for, in Washtenaw County and beyond, and the failures arrive in the order the parts tire.
Growth wrote this metro's newest HVAC chapter in matched equipment and planned ducts: systems sized as a single design, controls by the catalogue, outdoor units placed by the plat across the subdivisions near Ypsilanti and Saline. The chapter is young — its systems have decades in hand — but it is not exempt from the metro's arithmetic: 520 cooling degree days of demand work its condensers hard, and the winters test its heat pumps with the same cold that tests the oldest furnace in Washtenaw County.
The climate written over all of it comes from the NOAA station at ANN ARBOR MUNI AP, MI US: an average year brings 6,742 heating degree days, 520 cooling degree days and 29.78 inches of precipitation. Those are not abstractions to a furnace or a condenser — they set how many hours a heating system runs each winter, how hard a cooling system cycles in July, and how much moisture every coil has to pull out of the indoor air. The problem sections that follow are selected by exactly these numbers, combined with the housing-age profile above.
Two public records, one metro: what was built here, and what the sky does to it.
Break the stock down by building era and the profile sharpens. Before 1960: 25.2% of homes, roughly 39,845 of them. From 1960 to 1979: 27.7%, about 43,798. From 1980 to 1999: 26.5%, about 41,900. Since 2000: 20.7%, about 32,730. Four eras, four equipment generations — and the balance among them is this metro's HVAC character in a single paragraph.
Call this the transition metro. Its biggest band of housing went up between 1960 and 1979, when the trade was mid-change: cooling arriving street by street, duct layouts improvising around houses designed before it, heating generations overlapping. That mixture is the defining fact — two neighbouring Ann Arbor homes of the same year can hold systems with different futures, which is why this metro's HVAC rewards inspection over assumption more than most.
Second in the table, the 1980-1999 band: 41,900 homes, 26.5% of the metro. Its systems are mature rather than ancient — ducts still sound, first-generation efficiency equipment wearing toward its verdicts, controls reaching their wear points in waves — and its HVAC is the schedulable kind: work that rewards being booked before it becomes urgent.
Start the climate half where the system starts: at the thermostat's two seasons. Ann Arbor's cooling answers 520 cooling degree days of load and its heating answers 6,742 heating degree days of cold at ANN ARBOR MUNI AP, MI US — an average temperature of 47.8 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.
A profile is only useful if it predicts something, and this one predicts the shape of an HVAC diary in Ann Arbor: which streets will call about cooling, which about heating, which about airflow, and in which months. Everything after this section is that prediction written out as services, problems and answers — the numbers first, the narrative second, the way the evidence actually runs.
Sequenced by this metro's own problem ranking, not by a national catalogue order.
Every repair through TempReach USA follows the same order: diagnosis at the equipment, findings explained, quote given before work begins, and a full test cycle before the technician leaves your Ann Arbor home.
One more pattern belongs in the Ann Arbor 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 83,643 pre-1980 homes it is a conversation held weekly. The 29.78 inches of rain in an average year here is part of the story too — humidity loads every cooling coil in the metro.
The local caseload behind this service is written in the climate figures: 520 cooling degree days a year and 10.8 days at 90 or above, pressing on a cooling fleet whose oldest members serve the 83,643 pre-1980 homes — in Ypsilanti (19,937 residents) as much as in the oldest districts.
Verification is part of the service: a camera view, an opened panel, a register you can inspect yourself. The point of the visit is a duct system you have seen clean, not one you have been told is clean.
A word on timing, since Ann Arbor 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 Ann Arbor and across the metro alike. With a median build year of 1978, most of the metro's 158,115 housing units are working through the same ageing curve.
Duct demand concentrates in the metro's long-biography homes: 83,643 pre-1980 systems that have carried decades of household air, and the renovated homes around Whitmore Lake (8,083 residents) whose construction dust is still in the runs.
Furnaces rehearse their failures: second-attempt ignition, shortening cycles, a louder blower. In Ann Arbor those early signs are the cheapest version of the repair, caught while the house is still warm.
Read Ann Arbor'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. The ANN ARBOR MUNI AP, MI US record — 6,742 heating degree days, 520 cooling — is the backdrop Washtenaw County technicians plan around.
Under Ann Arbor's winters lie 6,742 heating degree days a year, and the furnaces answering them include the ageing units of the 83,643 pre-1980 homes alongside the electronic systems of the new subdivisions. The repair diary in Dexter reads both ends of that stock in a single week.
One call from anywhere in Ann Arbor's 14 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.
Across Washtenaw, the service record is the scarcest asset: with a median build year of 1978 across 158,115 homes, many systems around Ann Arbor have no documented history — and a first tune-up's baseline is what every later decision stands on.
From Ann Arbor to Whitmore Lake, Ann Arbor replacements routed through TempReach USA end in commissioning — measured charge and airflow — so the installed system matches the calculated one.
With 158,115 homes and a median build year of 1978, Ann Arbor heating stock spans every era of furnace and flue — each installation assessed on its own house, not on the outgoing unit's label.
Across 14 ZIP codes and housing from a median build year of 1978, Ann Arbor heat pumps are specified and serviced from heat-loss figures and low-temperature performance data, not nominal tonnage.
Ductless installation in Ann Arbor is surveyed room by room across Washtenaw: the independent local professional calculates each space's load, plans line and drain routes, and quotes the complete design before work begins.
With a median build year of 1978 across 158,115 homes, Ann Arbor holds both air problems at once — envelopes that leak air freely and envelopes sealed tight — and the local professional assesses which house yours is before recommending equipment.
From Ann Arbor to the metro's edge, Ann Arbor's 158,115 homes run every system type there is — single-stage furnaces, two-stage equipment, heat pumps with auxiliary heat — and each gets a control matched to its terminals, not a shelf guess.
In Ann Arbor, commercial work follows the stock: 158,115 housing units' worth of mixed buildings — offices, retail and restaurants from Ann Arbor across the 14 covered ZIP codes — each with rooftop units whose service rhythm the local professional sets per building.
If this page's services were ranked by Ann Arbor's call patterns rather than listed in catalogue order, they would come out much as they do here — because the ranking behind them is data, not habit. The refrigerant transition reaching older systems leads the metro's problem table and leaky ducts losing air and energy follows, so the services answering them lead the list. The long tail of a metro's HVAC life — thermostat calls, duct questions, the one room that never matches the rest — fills in the diary around them, here as everywhere.
Ranked for this metro alone, from its Census housing profile and NOAA climate record.
It is worth saying plainly what the transition is not. It is not a mandate to replace working equipment, not a deadline after which older systems become unusable, and not a verdict on the many R-22 and early R-410A systems still cooling Ann Arbor homes adequately. Systems are retired by economics and condition, not by calendar. What the transition changes is the slope of those economics: each year, the older generation's refrigerant and parts grow scarcer while the machine itself grows older, so the repair-versus-replace crossing arrives a little earlier than the same failure would have suggested a decade ago. Honest service practice in this metro states that slope openly and lets the household's own numbers — the unit's age, its condition, its history — make the call. The refrigerant in the pipes has become a fact of the house, like its roof's age: not urgent every day, and unwise to leave unexamined.
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 Ann Arbor, 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 regulatory facts are the foundation: R-22 production and import ended in the United States in 2020, leaving reclaimed stock as the supply, while new equipment has moved through R-410A to the current lower-impact generation. In Ann Arbor every generation still stands in service — the transition is not coming to this metro; it is distributed across it, yard by yard.
Duct loss hides inside other complaints. It presents as an air conditioner that cannot keep up in July — because the supply run through the attic is delivering air that picked up heat the whole way there. It presents as dust that returns days after cleaning, drawn in through return leaks in the crawl space. It presents as a furnace that heats the basement ceiling handsomely and the bedrooms modestly. In Ann Arbor, where many homes route their ducts outside the conditioned envelope by design of their era, these presentations are common enough to have a standing place in a technician's first questions. Separating duct loss from equipment weakness takes measurement rather than opinion — pressures and temperatures at the registers compared with those at the unit — and the separation matters, because the remedies are entirely different and only one of them touches the actual loss.
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 Ann Arbor 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 load figures complete the case: 520 cooling degree days and 6,742 heating degree days at ANN ARBOR MUNI AP, MI US mean the network is in service in earnest at both ends of the year. Duct loss here is not a summer inefficiency or a winter one; it is a twelve-month tax on a system that works both seasons.
The no-heat call in deep cold has a recognizable biography in Ann Arbor. The furnace usually announced itself first: a startup that grew slower, a rattle at ignition, short runs that left the house short of the setting, a burner that lit with a sound it did not used to make. Cold weather raises the stakes of each symptom — a furnace cycling short in mild weather merely underheats; the same furnace in a hard freeze cannot hold the house at all, and the pipes in the exterior walls begin their own countdown. That is why technicians treat winter furnace symptoms as scheduling information rather than background noise: the system is filing its report early, and the household that books on the report rather than the failure chooses its own timing instead of the weather's.
Judge a furnace by its coldest week, not its kindest. In its coldest week a Ann Arbor 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. ANN ARBOR MUNI AP, MI US's record — 149.5 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.
The timing testifies. Furnace failures in Ann Arbor concentrate in the coldest stretches of the 149.5 freezing nights ANN ARBOR MUNI AP, MI US records — the failures follow the load curve, which is the signature of wear meeting demand rather than chance meeting a machine.
Winter in Ann Arbor is heating season in earnest. With 6,742 heating degree days and 149.5 nights a year at or below freezing on the record at ANN ARBOR MUNI AP, MI US, the furnaces and heat pumps here are not occasional equipment — they are the household's winter infrastructure, and the season examines them accordingly. The preparation belongs to autumn: the heating system run and proven before the first hard cold, its ignition and safety chain observed through a full cycle, the filter renewed, vents and intakes checked where snow and ice will later reach them, and the household's own knowledge refreshed — where the system switch is, where the water main closes, what the house's plan is if heat stops on the coldest night rather than a mild one. During the season the rhythm is watchfulness: startup sounds that change, rooms that begin to fall behind, lockouts that recover but recur — each is the system filing its report early, and in deep cold the gap between an early report answered and a failure collected is the whole difference between an appointment and an emergency with the plumbing on a countdown behind it.
The season loads Ann Arbor's systems the way its record at ANN ARBOR MUNI AP, MI US says it will: 6,742 heating degree days against 520 cooling degree days in an average year, against a housing stock whose median build year is 1978. The households that read the season early — filters, drains, a system run before the extreme weeks — are the ones whose calls stay schedulable.
There is a supply-side depth as well. A shrinking refrigerant does not vanish; it circulates — recovered from retired systems, reclaimed to specification, and returned to service at an expense that reflects the shrinking pool. In Ann Arbor that means the R-22 in a system serviced this year may have cooled three other homes before it, and may cool another after this system retires, provided it is recovered rather than vented. The chain gives older equipment a managed twilight rather than a cliff: service remains possible, performed by technicians qualified for the work, for as long as the economics hold for the household. Understanding that chain replaces two common errors — that old systems are already unserviceable, and that they can be serviced forever as cheaply as ever — with the true picture: a gradually tightening supply, a gradually aging fleet, and a decision that improves with information and worsens with delay.
Read the ranking backwards and it reads as a data summary: 368,394 residents in 158,115 housing units, 25.2% of the housing from before 1960, 29.78 inches of rain in an average year. The pattern leads because the exposure is broad — counted not in individual unlucky houses but in whole eras of the metro's building, stacked one on another.
Experienced local practice starts with the simple certainties — the observations that take minutes and decide the most:
PROBLEM
SOLUTIONPopulation 121,179
Population 19,937
Population 8,976
Population 8,083
Population 5,420
Population 4,495
Population 2,375
Population 478
The communities in the grid are not suburbs of the page; they are its subject as much as Ann Arbor is. Ypsilanti (19,937 residents) and Saline (8,976) carry their own building decades, their own equipment generations and their own positions in the problem ranking's logic — a system under a Ypsilanti 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.
The map continues: Whitmore Lake (8,083), Chelsea (5,420), Dexter (4,495), Manchester (2,375), Barton Hills (478). Different names, different decades — each community in Washtenaw was fitted with heating and cooling in its own growth years, which is why two streets in the same metro can need entirely different HVAC conversations. The ZIP list below is the working definition of coverage; the housing behind each code is the working definition of the job.
The metro's weight is not evenly spread. Ann Arbor holds 121,179 of the 368,394 residents; Ypsilanti and Saline add 19,937 and 8,976; 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.
Administratively the metro is drawn from Washtenaw — 1 in all — with Washtenaw County at its centre. County lines do not change how a system runs, but they do shape the paperwork around the work: permits, inspections and code details are county and city business, which is one reason the professional who serves your street is a local one.
Three neighbouring coverage areas begin where this one ends: Jackson, MI, some 30 miles off; Monroe, MI, 30 miles; and Detroit, MI, 44 miles. Each keeps its own page because each keeps its own numbers — a different median build year, a different climate station, a different problem ranking. Boundary households should trust the ZIP list over the map: the code, not the compass, assigns the dataset.
Set Ann Arbor among its neighbours and the contrasts sharpen the profile: Jackson, MI — metro population 159,552, median build year 1966 — sits 30 miles away; Monroe, MI (156,004, median 1973) 30 miles; Detroit, MI (4,390,913, median 1968) 44 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.
The stock has a shape as well as a size. Owners hold 61.6% of it and renters 38.4%, a split that decides who notices a comfort problem first and who arranges the repair. The generations split 2.6-to-one in favour of the pre-1980 homes. And the map divides into 8 named communities across Washtenaw, each carrying its era's share of the 158,115 housing units the Census counts here.
Ann Arbor by the derived numbers — median home age 48 years · owners in 91,942 homes, renters in 57,314 · each covered ZIP code carrying about 2,846 pre-1960 homes · a heating-to-cooling degree-day ratio of 12.97 · 756 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
Describe the problem and the call center routes you to an independent local HVAC technician who works in the Ann Arbor metro.
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