The county-level homework for St. Tammany Parish, Louisiana — its 845 square miles, its 16 ZIP codes, its place inside the Slidell 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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St. Tammany Parish covers 845 square miles in Louisiana. Its climate is read from the normals recorded at SLIDELL AP, LA US — 1,612 heating degree days against 2,634 cooling degree days — and its dominant pressure is a humid one. TempReach USA is a referral service, not an HVAC company: one call connects you with an independent local HVAC technician serving the county.
The climate figures on this page are the primary metro's NOAA 1991-2020 normals — climate normals recorded at SLIDELL AP, LA US, the station for the Slidell metro this county belongs to. An average year there brings 1,612 heating degree days, 2,634 cooling degree days, 61.88 inches of precipitation, 79.9 days at 90 degrees or above and 23.5 nights at or below freezing, around an average temperature of 67.7 degrees.
Read St. Tammany Parish's humidity through its calendar and a pattern emerges: the wettest weeks and the hottest weeks are neighbours, so the condensate drain, the coil and the blower are all examined by peak load at the same time, across every community in the county at once. That overlap is the humid profile's real pressure — not heat alone, not moisture alone, but both arriving together over 845 square miles, 79.9 hot days a year, with no dry season long enough for a neglected system to hide in.
One more county fact belongs in the record: position. St. Tammany Parish sits at 30.410022, -89.951962 on the map — the centroid of a county whose communities spread across 845 square miles of Louisiana. 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.
The ZIP list is the county's working map. St. Tammany Parish carries 16 codes, running from 70420 through 70452 in the middle of the list to 70471 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.
A county with no neighbours on its record is a simpler map: St. Tammany Parish, 845 square miles of Louisiana, sitting close to the centre of the Slidell metro and carrying the Slidell metro's coverage at its edge. Nothing about the work simplifies with the map — the county's housing still spans its building decades, its systems still answer the full degree-day record — but the page can keep its whole attention on one county's ground, which is what it does.
Consider what one year asks of a system in St. Tammany Parish: a cooling season measured at 2,634 degree days, a heating season at 1,612, 79.9 days of serious heat and 23.5 freezing nights, and 61.88 inches of precipitation working on every outdoor unit through all of it. No single figure is remarkable; the combination is the county's climate, and it is the combination a system has to survive for fifteen or twenty years. The service patterns described on this page are that arithmetic, playing out across 845 square miles of housing.
Name the ground and the work follows: in St. Tammany Parish, the 12 listed communities — Slidell, Mandeville, Covington, Eden Isle among them — hold the county's homes, and the homes hold its heating and cooling systems. The largest places supply the steadiest run of calls; the smaller communities supply the long drives and the systems fitted when those places were built. Either way, the county's 845 square miles are not read as one housing stock on this page, because on the ground they are not one: they are these communities, in this order, with these names.
Census figures give St. Tammany Parish's heating and cooling its proportions. The metro it belongs to counts 112,414 housing units across 103,286 households, 78.8% of them owner-occupied, and the era mix runs 4.5% before 1960, 18.4% from 1960 to 1979, 37.4% from 1980 to 1999 and 39.7% since 2000. A county inside that metro inherits the mix in its own proportions — which is why two homes on the same St. Tammany Parish street, built forty years apart, can need entirely different conversations from the same technician.
One way to hold St. Tammany Parish in mind is as the local layer of a wider dataset. Above it sits the Slidell metro, with its Census housing profile and its NOAA station at SLIDELL AP, LA US. At this level sit the county's own numbers — 845 square miles, 0 neighbouring counties, 16 ZIP codes, 12 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 28,664
Population 12,931
Population 11,568
Population 7,753
Population 6,883
Population 2,669
Population 2,614
Population 971
Population 722
Population 491
Population 242
Population 217
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 St. Tammany Parish and the Slidell 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