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Sizing a furnace for this house is not a generic exercise because the burner, heat exchanger, and ignition system are going to cycle hard for most of the calendar year. Homes in Pueblo County, CO run heat about eight months a year, from October through May. A contractor quoting a replacement here has to run a load calculation specific to this structure before recommending equipment, because a unit that is undersized starts cycling more than it should, and the heat exchanger takes the punishment first. Proper commissioning matters for the same reason: a small installation error compounds across a long season.
Existing ductwork is what a furnace installation turns on in much of Pueblo County. Half the homes in Pueblo County, Colorado were built in 1974 or earlier (2020-2024 ACS 5-year). A house built that long before today's high-efficiency furnaces were designed was ducted for different equipment, with different airflow requirements, and that original ductwork is what a contractor has to measure and assess before settling on a unit or writing a price. If the duct system cannot carry what a new furnace delivers, the scope of the job changes before the equipment is even chosen.
What Gets Installed With a New Furnace
The furnace itself sits inside the house, most often in a basement, utility closet, or mechanical room. It holds the burner assembly, the heat exchanger, and the blower in a single cabinet. That cabinet is what a contractor sets in place and connects to the rest of the system.
The flue pipe runs from the furnace to an outside wall or up through the roof, carrying combustion exhaust out of the house. The thermostat mounts on an interior wall and gives the homeowner control over when the furnace fires. A gas line ties into the burner, and a condensate drain is added on high-efficiency units to carry off moisture.
The drawing shows a typical layout, and a licensed contractor determines what the work looks like in your specific home.
Get matched in Pueblo CountyPueblo County, by the numbers
552 severe weather events were recorded in Pueblo County, Colorado 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 Pueblo County, Colorado were built in 1974 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPueblo County, Colorado holds 73,646 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 68.9% of the occupied homes in Pueblo County, Colorado (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Pueblo County, Colorado4 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.
Severe Weather Events in Pueblo County
Extreme weather puts direct stress on heating equipment, shortening service life and driving up energy use when systems are undersized or poorly matched to local conditions. Furnace installation in Pueblo County is a decision shaped by what the climate here actually demands.
552 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.