St. Louis City heating and cooling, county by county: 62 square miles of Missouri lying close to the centre of the St. Louis metro, 19 ZIP codes, and a climate record read from ST LOUIS LAMBERT INTL AP, MO US. TempReach USA connects you with an independent local HVAC technician; this page sets out the county's own figures.
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St. Louis City in one paragraph: 62 square miles in Missouri, 19 ZIP codes, a heating climate pressure read from the normals at ST LOUIS LAMBERT INTL AP, MO US, and housing that answers 4,433 heating degree days against 1,713 cooling degree days a year. TempReach USA is a referral service, not an HVAC company — one call connects you with an independent local HVAC technician serving this county.
Every climate number on this page comes from one record: the NOAA 1991-2020 normals at ST LOUIS LAMBERT INTL AP, MO US, the primary metro's station, read here for St. Louis City. The record's shape is 4,433 heating degree days set against 1,713 cooling degree days, 41.7 inches of precipitation in an average year, 47.1 days reaching 90 degrees or above and 84.9 nights at or below freezing, with an average temperature of 57.4 degrees across the year.
Read the climate record and the county's pressure names itself. Heating degree days outnumber cooling degree days at ST LOUIS LAMBERT INTL AP, MO US, and the lived version of that statistic is a housing stock whose furnaces and heat pumps run the long season while its cooling takes the short one. Across St. Louis City's 62 square miles — from St. Louis to the county's edge communities — the pattern repeats: systems sized for the cold, maintained for the cold, and replaced, when their time comes, with the cold in mind first.
Distance is the county fact the climate table leaves out. St. Louis City's centroid lies close to the centre of the St. Louis metro, roughly 9 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 19 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. St. Louis City carries 19 codes, running from 63101 through 63111 in the middle of the list to 63155 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.
Neighbouring counties are the honest context for St. Louis City's figures. Its 62 square miles sit inside a wider spread of county ground — Franklin County, Jefferson County, Jersey County are among the 14 neighbours on its record — and its position close to the centre of the St. Louis metro places it on its own side of that spread. A system near the county's edge may be closer to a neighbouring county's centre than to its own; the pages are organised by county because the data is, and the links between them carry the rest of the picture.
Extremes, not averages, fill St. Louis City's emergency diary, and the record names them precisely: 47.1 days a year at 90 degrees or above, 84.9 nights at or below freezing. Between those figures sits the ordinary year — an average of 57.4 degrees, 41.7 inches of rain — in which systems mostly age quietly. The two ends are when ageing becomes failure, which is why the county's dominant heating pressure, the taller of its two peaks, sets the rhythm of its maintenance year as well.
Read St. Louis City through its record and two facts stand together: its named communities are St. Louis, and its land runs to 62 square miles. Between those facts sits the county's real housing — homes in the named places, homes along the roads the record does not name, all of them heating and cooling under the climate recorded at ST LOUIS LAMBERT INTL AP, MO US. This page keeps both facts in view, because a county page that only described its named places would miss most of the county it is about.
Look at the second era as well as the first and St. Louis City's stock comes into focus. After the dominant band — homes built before 1960, 33.8% of the metro's total — the next share was built between 1960 and 1979, at 25.0%. Between them those two bands account for most of the systems a technician will open in this county, and they are different machines in different houses: the earlier band's equipment fitted into older envelopes, the later band's into the standards of its own decade. The county's diary is the two bands, interleaved street by street.
Coverage, for St. Louis City, is a set of overlapping maps. The land map is 62 square miles. The address map is 19 ZIP codes and 1 listed communities. The service map is the St. Louis metro, whose coverage the county sits inside — close to the centre of the St. Louis metro, roughly 9 miles from its centre. The weather map is one station's record, kept at ST LOUIS LAMBERT INTL AP, MO 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 293,109
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. Louis City and the St. Louis 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