The county-level homework for Union County, Tennessee — its 224 square miles, its 3 ZIP codes, its place inside the Knoxville metro's coverage. TempReach USA connects homeowners here with independent local HVAC technicians; the record behind the routing is on this page.
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Union County covers 224 square miles in Tennessee. Its climate is read from the normals recorded at OAK RIDGE ASOS, TN US — 3,483 heating degree days against 1,628 cooling degree days — and its dominant pressure is a heating one. TempReach USA is a referral service, not an HVAC company: one call connects you with an independent local HVAC technician serving the county.
One record, one county: the normals at OAK RIDGE ASOS, TN US — 3,483 heating degree days, 1,628 cooling degree days, 55.53 inches of precipitation, an average temperature of 59.8 degrees — applied to Union County's own 224 square miles and its 3 ZIP codes. The figures are the Knoxville metro's; the ground they are applied to, lying northeast of the Knoxville metro's centre, is this county's alone, and this section reads the two together.
The heating season also has an address pattern in Union County. Its 3 ZIP codes divide 224 square miles into service ground where the same January night lands on older streets, subdivisions and edge communities at once, and the county's position — northeast of the Knoxville metro's centre, roughly 22 miles from the metro's centre — shapes which parts of the county feel the Knoxville metro's cold at full strength. The systems answer accordingly: one long heating season, read ZIP by ZIP, with the oldest furnaces and heat exchangers carrying the heaviest share of it.
The county's neighbours frame it as well: Knox County, Loudon County, Morgan County are among the 8 counties on its neighbour list, and together they form the working ground around Union County's own 224 square miles. A system near a shared border lives in both counties' weather at once, whichever page describes its home — the pages divide the map so the record can be read county by county, and the links between them keep the whole in view.
Count the coverage from the codes upward: 37779, 37807 and 37866 are the first codes on Union County's list of 3, spread across its 224 square miles in Tennessee. No two of those codes hold quite the same housing — one may be a settled community's streets, the next newer subdivisions, the next open county ground — so the same climate record produces a different run of calls inside each. The full list is printed on this page; the diary is written code by code.
The counties around Union County include Knox County, Loudon County, Morgan County, and the whole group shares the Knoxville metro's climate record from OAK RIDGE ASOS, TN US. What the neighbours do not share is this county's ground: 224 square miles, 3 ZIP codes, a centroid northeast of the Knoxville metro's centre. Service patterns cross the county line freely — a cold week fills diaries on both sides of it — but the mix of housing and systems on each side is its own, which is why each county in the group carries its own page.
The precipitation figure earns its place in Union County's record: 55.53 inches a year at OAK RIDGE ASOS, TN US, falling through both the cooling months and the heating ones. Rain loads condensate systems in summer, tests outdoor units and venting in winter, and keeps the ground around the county's 3 ZIP codes cycling between wet and dry in a way that shows up in crawl spaces and condensate lines. Set beside 44.3 hot days and 67.8 freezing nights, it completes the picture of what the county's equipment actually lives in.
Union County is recorded by land and code rather than by named places: 224 square miles in Tennessee, lying northeast of the Knoxville metro's centre, roughly 22 miles from the metro's centre as the map measures it. Its households sit inside the Knoxville 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 housing behind Union County's systems is the Knoxville metro's housing, read at county scale. The largest single share of the metro's homes was built between 1980 and 1999 — 29.4% of the stock — with 43.4% of homes predating 1980 and 27.2% arriving since 2000, around a median build year of 1985. 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.
The county is worth a page of its own because its facts do not reduce to its metro's. The Knoxville metro supplies the climate station and the housing profile, but Union County supplies everything at ground level: 224 square miles, its own communities and codes, its own neighbours — Knox County, Loudon County, Morgan County among the 8 on its list — and its own position, northeast of the Knoxville metro's centre. The metro page and this page link to each other because neither half of that picture stands well without the other.
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 Union County and the Knoxville 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