McHenry County heating and cooling, county by county: 603 square miles of Illinois lying northwest of the Chicago metro's centre, 18 ZIP codes, and a climate record read from CHICAGO MIDWAY AP, IL US. TempReach USA connects you with an independent local HVAC technician; this page sets out the county's own figures.
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In brief: 603 square miles of Illinois, a climate read from CHICAGO MIDWAY AP, IL US's normals, and a heating pressure as the county's dominant one — 5,753 heating degree days set against 1,111 cooling degree days in an average year. TempReach USA does not do the work itself; it is a referral service, and one call connects you with an independent local HVAC technician serving McHenry County.
Climate on this page is not a national average wearing a county's name. It is the specific record at CHICAGO MIDWAY AP, IL US: 52.1 degrees as the average temperature, 34.42 inches of precipitation, 19.8 hot days and 106.3 freezing nights in the average year, 5,753 heating degree days against 1,111 cooling degree days. McHenry County — 603 square miles, 18 ZIP codes, 0 listed communities — lives inside that record, and its heating and cooling systems are sized, serviced and replaced inside it too.
McHenry County is heating country by the numbers: 5,753 heating degree days a year, 106.3 freezing nights, and homes spread over 603 square miles all asking their systems the same question on the same January night. The cooling half of the equipment matters — 1,111 cooling degree days is not nothing — but it is the heating load that decides which systems fail, and when. Local technicians read the county that way: autumn tune-ups, honest conversations about ageing furnaces and heat exchangers, and vans stocked for the cold weeks.
One more county fact belongs in the record: position. McHenry County sits at 42.324298, -88.452245 on the map — the centroid of a county whose communities spread across 603 square miles of Illinois. Position decides which end of the metro's weather arrives first and which of its service patterns a household here meets most; the rest of this page is that position, read through the climate record and the metro's data.
A ZIP code in McHenry County is a small climate-and-housing district of its own. The county's 18 codes — 60012, 60013, 60014, 60021 among them — all read the same normals from CHICAGO MIDWAY AP, IL US, yet the systems inside them were installed in different decades, serve different house sizes, and fail in different orders. That is why this page prints the whole list rather than a summary: the codes are the finest division of the county the data supports, and they are the division the work itself follows.
McHenry County sits alongside Cook County, DeKalb County, DuPage County in the Chicago area — 12 neighbouring counties share its coverage map in all, and the borders between them are lines on a map rather than changes in the weather. The same station record travels across those borders, the same housing decades appear on both sides, and a technician's ground here is really the cluster: this county and its neighbours, read together, with this page keeping McHenry County's own share of the picture separate.
A service calendar for McHenry County can be written straight from its station record. Spring belongs to the cooling plant: 1,111 cooling degree days are coming, and the systems that will carry them are checked before the first of the 19.8 hot days arrives. Autumn belongs to the heating plant, ahead of 5,753 heating degree days and 106.3 freezing nights. The middle weeks belong to the unglamorous work — filters, drains, duct joints — that both seasons quietly depend on. The record at CHICAGO MIDWAY AP, IL US does not change much year to year, which is what makes the calendar worth keeping.
McHenry County is recorded by land and code rather than by named places: 603 square miles in Illinois, lying northwest of the Chicago metro's centre, roughly 54 miles from the metro's centre as the map measures it. Its households sit inside the Chicago metro's coverage and share its climate record, but their heating and cooling diary is written at address level — a system in a house on a county road, ageing on its own house's schedule. A county page built from a place list would have little to say here; a page built from the ground itself has the county as it is.
The county's position frames its housing as well. McHenry County lies northwest of the Chicago metro's centre, roughly 54 miles out, and the metro's era mix — 38.0% built before 1960, 25.6% between 1960 and 1979, median year 1970 — reads at this distance with a county accent: the shares nearer the centre and the shares at the edge were platted in different decades of the metro's growth. Which band a given McHenry County street belongs to is a local fact; that the bands exist, in these proportions, is the Census record this page is built on.
Coverage, for McHenry County, is a set of overlapping maps. The land map is 603 square miles. The address map is 18 ZIP codes and 0 listed communities. The service map is the Chicago metro, whose coverage the county sits inside — northwest of the Chicago metro's centre, roughly 54 miles from its centre. The weather map is one station's record, kept at CHICAGO MIDWAY AP, IL US. A home in this county lives on all four maps at once, and its heating and cooling needs are set by the combination.
City pages carry the metro-wide homework — housing eras, the problem ranking, services in depth. This county sits inside their coverage.
TempReach USA is not an HVAC company. We employ no heating or cooling technicians, we run no service trucks, and we do not carry out HVAC work of any kind. This website and its call center exist for one purpose: to connect homeowners with independent local heating and cooling professionals who serve their area. When you call the number on this site, your call is routed to such a professional. From that point, everything about the job belongs to that professional and to you: the assessment, the work itself, the scheduling, what you are charged, and the terms of any agreement you reach. The professional who takes your job is solely responsible for it. The technician who arrives at your home runs their own business; they are not an employee, agent or subcontractor of TempReach USA. Our part is the information on these pages — assembled from Census Bureau housing data and NOAA climate records for each metro — and the routing of your call. We state this plainly on purpose: you should know exactly who you are hiring before anyone picks up a wrench or a gauge.
One call connects you with an independent local heating and cooling professional serving McHenry County and the Chicago metro.
Call center hours: Mon-Fri 7:00 AM-10:00 PM ET | Sat 8:00 AM-10:00 PM ET | Sun 7:00 AM-9:00 PM ET