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A contractor sizing a furnace for a Union County home is working out what the heating season here actually demands, week after week, rather than preparing for a weather record that would push the system to its limits. 61 severe weather events were recorded in Union County, Pennsylvania between 2015 and 2024. At that rate, severe weather is an occasional fact of life in this area, not a standing condition the equipment fights through every month. A furnace installed here will spend the bulk of its life handling routine cold, which means the quality of the sizing calculation and the installation itself determine how the system performs far more than any storm history does.
Ductwork laid down for an older furnace was sized around that furnace's output, its blower speed, and the layout priorities of the era it was built in. Half the homes in Union County, Pennsylvania were built in 1974 or earlier (2020-2024 ACS 5-year). A contractor quoting a new furnace here has to treat the existing duct system as an open question, not a given. Where the trunks are undersized or the returns are too few, the new unit runs against resistance the installer has to resolve before the equipment ever fires. The electrical service is a separate check. Both are variables the house sets, and the house sets them before any equipment is chosen.
What Gets Installed With a New Furnace
The furnace itself sits in the basement, utility room, or closet and is the unit that produces heat for the house. Attached to it is the flue or exhaust vent, which runs through the wall or roof and carries combustion gases out of the home. The air handler, sometimes built into the furnace cabinet, moves conditioned air into the duct system.
The thermostat mounts on an interior wall and is the control point the homeowner sees and sets every day. Near the furnace, a contractor also installs the filter housing and the blower assembly, both of which sit within or directly beside the main cabinet and work together to pull return air in before it is heated and pushed back out.
The drawing shows a general layout of these components, and a licensed contractor determines exactly how each one applies to your house.
Find a contractor in Union CountyUnion County, PA, by the numbers
61 severe weather events were recorded in Union County, Pennsylvania between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Union County, Pennsylvania were built in 1974 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, Pennsylvania holds 16,205 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.3% of the occupied homes in Union County, Pennsylvania (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Union County, Pennsylvania7 codes, standards, and laws
What the installation actually looks like
Non-weatherized gas furnaces manufactured on or after November 19, 2015 must reach 80.0 percent AFUE.
Non-weatherized oil-fired furnaces manufactured on or after November 19, 2015 must reach 83.0 percent AFUE.
Mobile home gas furnaces manufactured on or after November 19, 2015 must reach 80.0 percent AFUE.
Non-weatherized gas furnaces manufactured on or after December 18, 2028 must reach 95.0 percent AFUE, up from the 80.0 percent minimum that applies to units manufactured before that date.
What Union County, Pennsylvania Requires for HVAC Installation
Pennsylvania names the trade in its own definition: installing central heating or air conditioning is a home improvement under the Act, whether or not the equipment is affixed — so an HVAC installation is work the registration requirement reaches.
A Pennsylvania registration displaces the local one: no political subdivision may require a home improvement contractor to register, license or pay a fee on top of it, though building permits and local code enforcement still apply.
Pennsylvania requires home improvement contractor registration rather than a licence: nobody may hold themselves out as a contractor, or perform any home improvement, without first registering with the Bureau of Consumer Protection.
Severe Weather Events in Union County
Weather puts a measurable load on heating equipment, and that load is not the same everywhere. A furnace sized and installed for what Union County actually sees will hold up differently than one specced to a national average.
61 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.