Fairfax County Heating & Cooling Services

The Fairfax County climate record

Every climate number on this page comes from one record: the NOAA 1991-2020 normals at WASHINGTON DC DULLES AP, VA US, the primary metro's station, read here for Fairfax County. The record's shape is 4,604 heating degree days set against 1,233 cooling degree days, 43.24 inches of precipitation in an average year, 32.7 days reaching 90 degrees or above and 101.7 nights at or below freezing, with an average temperature of 55.7 degrees across the year.

The neighbours tell part of Fairfax County's heating story: District of Columbia, Fairfax City, Falls Church City are among the counties around it, all reading the same record at WASHINGTON DC DULLES AP, VA US, all filling their diaries in the same cold weeks. What separates this county's share is its own ground — 391 square miles lying east of the Washington metro's centre, roughly 11 miles from the metro's centre — and its own housing, fitted across the decades its communities were built. The season is regional; the failures are local, one system at a time, at addresses only this county has.

Set the county inside its metro and the picture completes. Fairfax County answers to the Washington metro's data — its housing profile, its problem ranking, its climate station — but the county is where that data touches ground: 2 communities, 43 ZIP codes, one county's worth of systems ageing under the record kept at WASHINGTON DC DULLES AP, VA US. This page is that ground-level reading, kept separate from the metro page so the local detail is never averaged away.

The ZIP list is the county's working map. Fairfax County carries 43 codes, running from 20120 through 22044 in the middle of the list to 22315 at its end, and every code on it is a small housing census of its own — the building decades, the system generations, the duct materials of its streets. Heating and cooling work routed by those codes meets the county in slices, and the slices differ more than the county's shared climate record would suggest.

Fairfax County sits alongside District of Columbia, Fairfax City, Falls Church City in the Washington area — 22 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 Fairfax County's own share of the picture separate.

There is a geography to Fairfax County's seasons that the totals flatten. The county lies east of the Washington metro's centre, roughly 11 miles from the centre the record is measured against, and its 391 square miles do not meet a hot week or a cold snap in one voice: the ground nearer the metro and the ground at the county's far edge live the same 32.7 hot days and 101.7 freezing nights through different housing, fitted in different decades. One station record, one county, two ends of every season.

Communities and housing in Fairfax County

Read Fairfax County through its record and two facts stand together: its named communities are Centreville, Reston, and its land runs to 391 square miles. Between those facts sits the county's real housing — homes in the named places, homes along the roads the record does not name, all of them heating and cooling under the climate recorded at WASHINGTON DC DULLES AP, VA US. This page keeps both facts in view, because a county page that only described its named places would miss most of the county it is about.

The housing behind Fairfax County's systems is the Washington metro's housing, read at county scale. The largest single share of the metro's homes was built between 1980 and 1999 — 28.1% of the stock — with 46.0% of homes predating 1980 and 25.9% arriving since 2000, around a median build year of 1983. Inside the county those eras divide by community and by street, but the proportions set the diary: a stock weighted to between 1980 and 1999 produces the service patterns of that era's systems, ducts and insulation, in this county as across the metro.

There is a reason the coverage on this page is described county-first. Heating and cooling demand is generated house by house, and houses sit in counties: in Fairfax County's case, across 391 square miles that hold 2 listed communities and 43 ZIP codes, east of the Washington metro's centre. The metro frame matters — the station, the housing eras, the problem ranking all come from it — but the county is where the frame touches the ground, and the ground is where the systems are.

Our role in Fairfax County, stated plainly

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.