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Sizing a furnace for a Tompkins County home starts with what the burner and heat exchanger are actually being asked to carry through a full heating season. Homes in Tompkins County, NY run heat about nine months a year, from September through May. A unit that is undersized runs long cycles without recovery time, stressing the heat exchanger at both ends of every cold spell. The ignition system and blower motor accumulate wear at the same rate the burner does, so a contractor has to size for the whole load before committing to equipment grade or warranty tier.
Ductwork sized for a different era of equipment does not quietly adapt when a new furnace goes in. A contractor has to pull dimensions, check static pressure, and decide whether what is already in the walls can carry the load a new unit will push through it. Half the homes in Tompkins County, New York were built in 1974 or earlier (2020-2024 ACS 5-year). That is the generation of ducting a contractor is working with across a wide share of jobs here, and it is where the installation scope gets settled, not at the equipment selection stage.
What Gets Installed With a New Furnace
The furnace itself sits inside the home, most often in a basement, utility closet, or mechanical room. It holds the burner, the heat exchanger, and the blower, all housed in a single cabinet. That cabinet is the piece a contractor positions and connects first.
The flue pipe runs from the cabinet to an exterior wall or up through the roof, carrying combustion gases out of the house. A thermostat mounts on an interior wall and gives the homeowner control over the whole system. Some installs also include a new filter housing or an air handler, depending on what the existing setup already has in place.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Tompkins CountyTompkins County, by the numbers
113 severe weather events were recorded in Tompkins County, New York 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 Tompkins County, New York were built in 1974 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesTompkins County, New York holds 47,804 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 54.1% of the occupied homes in Tompkins County, New York (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Tompkins County, New York4 sourced standards and codes
What the installation looks like from your end
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.
Severe Weather Events in Tompkins County
Heating equipment in Tompkins County works against whatever the climate puts on it, and that workload shapes what a furnace needs to handle over its life. A contractor sizing and installing equipment here factors in local conditions, not national averages.
113 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.