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A contractor quoting a furnace installation in Lehigh County has to account for what the heating season here actually demands, not what a catalog specification assumes. 283 severe weather events were recorded in Lehigh County, Pennsylvania between 2015 and 2024. At that rate, severe weather is a standing condition, and it bears directly on how a system gets sized, how tightly the ductwork gets sealed, and where a contractor sets equipment margins. A unit that fits a gentler climate will run harder here, recover more slowly, and strain components that a properly spec'd install handles without issue.
Ductwork laid in for the heating systems that came before what runs in houses today was designed around different airflow demands, and a modern furnace puts different pressure on those runs than what they were originally built to handle. Half the homes in Lehigh County, Pennsylvania were built in 1968 or earlier (2020-2024 ACS 5-year). That age of construction means a contractor sizing and placing a new furnace has to assess the existing duct layout before anything else on the job moves forward. Trunks that are undersized, transitions that were patched over the years, or returns that were never adequate will push against the new equipment's performance regardless of what unit gets selected. The electrical service in houses of this vintage also gets checked, since the draw of current furnaces does not always match what older panels were set up to supply.
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. A contractor sets the burner assembly and heat exchanger inside that cabinet, along with the blower that pushes conditioned air out into the living space.
The flue pipe runs from the furnace to an exterior wall or roofline and carries combustion gases out of the house. Alongside it, the contractor connects the thermostat on an interior wall, which is the control point that tells the furnace when to fire and when to stop.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Find a contractor in Lehigh CountyLehigh County, by the numbers
283 severe weather events were recorded in Lehigh 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 Lehigh County, Pennsylvania were built in 1968 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLehigh County, Pennsylvania holds 151,220 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 65.6% of the occupied homes in Lehigh County, Pennsylvania (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace & HVAC Installation Rules on the Books for Lehigh County, Pennsylvania7 sourced standards & codes
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.
Licensing and Legal Requirements in Lehigh County, Pennsylvania
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 Lehigh County
Weather puts a measurable load on heating equipment, and that load varies by location. How hard a furnace works over its life depends in part on what the local climate asks of it, which makes this county's weather record a practical input when sizing and installing equipment.
283 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.