The county-level homework for Sullivan County, Indiana — its 447 square miles, its 9 ZIP codes, its place inside the Terre Haute metro's coverage. TempReach USA connects homeowners here with independent local HVAC technicians; the record behind the routing is on this page.
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
The short version of this page: Sullivan County runs to 447 square miles, its weather is the record kept at TERRE HAUTE HULMAN RGNL AP, IN US — 5,235 heating degree days, 1,077 cooling degree days — and its systems live under a heating pressure. One call to TempReach USA, a referral service rather than an HVAC company, connects you with an independent local HVAC technician serving the county.
Read Sullivan County's weather the way this page reads it: through the thirty-year normals kept at TERRE HAUTE HULMAN RGNL AP, IN US for the Terre Haute metro. Those normals give the county 1,077 cooling degree days and 5,235 heating degree days a year, 40.84 inches of precipitation, 23.6 days at 90 degrees or above, 110.3 nights at or below freezing, and an average temperature of 53.5 degrees — the fixed background every system in the county works against.
The neighbours tell part of Sullivan County's heating story: Clay County, Vermillion County, Vigo County are among the counties around it, all reading the same record at TERRE HAUTE HULMAN RGNL AP, IN US, all filling their diaries in the same cold weeks. What separates this county's share is its own ground — 447 square miles lying south of the Terre Haute metro's centre, roughly 25 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.
Distance is the county fact the climate table leaves out. Sullivan County's centroid lies south of the Terre Haute metro's centre, roughly 25 miles from the centre it is measured against, and that distance is travelled on every call routed here — out through the metro's nearer counties and into this one's 9 ZIP codes. Local knowledge in a county like this is partly a map held in the head: which roads, which communities, which end of the county a call is coming from.
The ZIP list is the county's working map. Sullivan County carries 9 codes, running from 47838 through 47855 in the middle of the list to 47882 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.
Sullivan County sits alongside Clay County, Vermillion County, Vigo County in the Terre Haute area — 3 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 Sullivan County's own share of the picture separate.
Two numbers organise Sullivan County's heating and cooling year: 5,235 and 1,077, the heating and cooling degree days in the normals at TERRE HAUTE HULMAN RGNL AP, IN US. Whichever runs larger decides the county's dominant pressure — here, a heating one — and with it the season a household should prepare for first. The supporting figures fill in the texture: 53.5 degrees as the year's average temperature, 23.6 hot days, 110.3 freezing nights, 40.84 inches of precipitation. Every paragraph on this page is, in the end, a reading of those six numbers on this county's ground.
Start the county at its named places: Sullivan, Shelburn, Farmersburg head a list of 3 communities recorded in Sullivan County. The list matters to heating and cooling because communities concentrate the housing — a street of homes built in one decade produces one kind of service diary, the next community's different decade produces another — and because the roads between the named places are part of the working day here. The county page's climate record is shared; the ground it lands on is divided among these names.
The growth figures deserve their own reading in Sullivan County. 16.0% of the Terre Haute metro's homes were built since 2000 — the largest or near-largest band in many of its counties — and those homes are now old enough that their first systems are reaching replacement age together, subdivision by subdivision. Set against them, the 63.4% of the metro's stock that predates 1980 is deep into its second and third systems. One county, two replacement waves running at once, and a maintenance diary that has to serve both.
One way to hold Sullivan County in mind is as the local layer of a wider dataset. Above it sits the Terre Haute metro, with its Census housing profile and its NOAA station at TERRE HAUTE HULMAN RGNL AP, IN US. At this level sit the county's own numbers — 447 square miles, 3 neighbouring counties, 9 ZIP codes, 3 listed places — and below it, not published anywhere, sit the individual homes whose systems all of it describes. This page works at the middle level, where the data is still local enough to act on.
City pages carry the metro-wide homework — housing eras, the problem ranking, services in depth. This county sits inside their coverage.
Population 4,250
Population 1,325
Population 1,083
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 Sullivan County and the Terre Haute 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