The county-level homework for Miami County, Ohio — its 407 square miles, its 11 ZIP codes, its place inside the Dayton 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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The short version of this page: Miami County runs to 407 square miles, its weather is the record kept at DAYTON INTL AP, OH US — 5,149 heating degree days, 1,154 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.
Climate on this page is not a national average wearing a county's name. It is the specific record at DAYTON INTL AP, OH US: 53.9 degrees as the average temperature, 41.33 inches of precipitation, 15.5 hot days and 109.9 freezing nights in the average year, 5,149 heating degree days against 1,154 cooling degree days. Miami County — 407 square miles, 11 ZIP codes, 2 listed communities — lives inside that record, and its heating and cooling systems are sized, serviced and replaced inside it too.
Divide Miami County's cold by its coverage and the heating diary sharpens: 11 ZIP codes over 407 square miles, 37.0 square miles per code on average, the codes running from 45312 to 45383. A furnace failure in the code nearest the metro reads differently from one at the county's far edge — not in the fault, which is the same worn igniter or tired blower, but in everything around it: the drive, the house's decade, the odds the system has already been replaced once. The cold itself, 5,149 heating degree days of it, is shared; the ground it is answered on is not.
One more county fact belongs in the record: position. Miami County sits at 40.053326, -84.228413 on the map — the centroid of a county whose communities spread across 407 square miles of Ohio. 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.
Routing in Miami County is written in five digits. The county's codes begin at 45312 and run to 45383, 11 in total, and between the first and the last sits the county's full spread of ground — 407 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 Miami County include Greene County, Montgomery County, and the whole group shares the Dayton metro's climate record from DAYTON INTL AP, OH US. What the neighbours do not share is this county's ground: 407 square miles, 11 ZIP codes, a centroid north of the Dayton 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.
A service calendar for Miami County can be written straight from its station record. Spring belongs to the cooling plant: 1,154 cooling degree days are coming, and the systems that will carry them are checked before the first of the 15.5 hot days arrives. Autumn belongs to the heating plant, ahead of 5,149 heating degree days and 109.9 freezing nights. The middle weeks belong to the unglamorous work — filters, drains, duct joints — that both seasons quietly depend on. The record at DAYTON INTL AP, OH US does not change much year to year, which is what makes the calendar worth keeping.
The county record names Troy, Piqua among Miami County's communities — a short list, and an honest one: much of the county's housing sits outside its named places, along the roads and in the settlements between them, across 407 square miles of Ohio. The heating and cooling diary follows that pattern. Calls cluster where the named communities cluster, then spread out along the county's ZIP codes, and the systems at the far ends of those drives were fitted in the decades their houses were built, community or no community.
Census figures give Miami County's heating and cooling its proportions. The metro it belongs to counts 371,428 housing units across 342,189 households, 64.8% of them owner-occupied, and the era mix runs 37.5% before 1960, 31.8% from 1960 to 1979, 17.9% from 1980 to 1999 and 12.8% since 2000. A county inside that metro inherits the mix in its own proportions — which is why two homes on the same Miami County street, built forty years apart, can need entirely different conversations from the same technician.
One way to hold Miami County in mind is as the local layer of a wider dataset. Above it sits the Dayton metro, with its Census housing profile and its NOAA station at DAYTON INTL AP, OH US. At this level sit the county's own numbers — 407 square miles, 2 neighbouring counties, 11 ZIP codes, 2 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 26,716
Population 20,533
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 Miami County and the Dayton 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