The county-level homework for Northampton County, Pennsylvania — its 370 square miles, its 22 ZIP codes, its place inside the Allentown 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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In brief: 370 square miles of Pennsylvania, a climate read from ALLENTOWN INTL AP, PA US's normals, and a heating pressure as the county's dominant one — 5,293 heating degree days set against 981 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 Northampton County.
The station for this county's metro is ALLENTOWN INTL AP, PA US, and its NOAA 1991-2020 normals are the source of every figure in this section. Precipitation averages 47.36 inches a year; the temperature record averages 53.1 degrees, built from 18.2 days at 90 or above and 118.1 nights at or below freezing; the workload totals 5,293 heating degree days and 981 cooling degree days. Northampton County is read through that record throughout this page.
There is a second heating pressure in Northampton County that the degree days only imply: repetition across distance. A cold snap does not visit one street here; it visits all 22 of the county's ZIP codes in the same night, from the communities nearest the metro's centre to the edge of its 370 square miles, and every ageing system in that ground is examined by the same low temperature at the same hour. That simultaneity — many systems, one weather, a county's worth of roads between the calls — is what makes the cold weeks in a heating-profile county feel different from the same weeks in a city.
The county's neighbours frame it as well: Carbon County, Lehigh County, Warren County are among the 3 counties on its neighbour list, and together they form the working ground around Northampton County's own 370 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.
Routing in Northampton County is written in five digits. The county's codes begin at 18013 and run to 18351, 22 in total, and between the first and the last sits the county's full spread of ground — 370 square miles from the metro-facing edge to the far side. A technician's week here is a tour of those codes, and the tour is also a tour of the county's building history, because each code's systems were largely fitted when that code's streets were built.
The counties around Northampton County include Carbon County, Lehigh County, Warren County, and the whole group shares the Allentown metro's climate record from ALLENTOWN INTL AP, PA US. What the neighbours do not share is this county's ground: 370 square miles, 22 ZIP codes, a centroid close to the centre of the Allentown metro. 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.
A year in Northampton County, counted the way a technician counts it, is not twelve months but two workloads and the weeks between them. The first workload is written as 981 cooling degree days, the second as 5,293 heating degree days; 47.36 inches of precipitation fall across both, and the average temperature of 53.1 degrees is simply the figure the two workloads leave behind when they are averaged. The county's heating pressure is whichever workload the count puts first — and the maintenance year is arranged around that ordering.
Name the ground and the work follows: in Northampton County, the 4 listed communities — Easton, Northampton, Wilson, Middletown 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 370 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.
Age is the county's second climate. The Allentown metro's median home was built in 1970, and 62.4% of its homes predate 1980 — in Northampton County, that share is the older districts and the long-settled communities, where ductwork from an earlier equipment era still serves replacement systems. The newer share, 16.5% built since 2000, concentrates in the county's growth edges. The service diary divides along that line: deep equipment-and-duct conversations at the old end, first-replacement and control conversations at the new one.
Coverage, for Northampton County, is a set of overlapping maps. The land map is 370 square miles. The address map is 22 ZIP codes and 4 listed communities. The service map is the Allentown metro, whose coverage the county sits inside — close to the centre of the Allentown metro, roughly 5 miles from its centre. The weather map is one station's record, kept at ALLENTOWN INTL AP, PA 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.
Population 29,079
Population 10,366
Population 8,196
Population 7,620
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 Northampton County and the Allentown 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