Tell us about the job
Takes about a minute. No obligation.
Sizing a furnace for Arapahoe County starts with understanding how little rest the burner and heat exchanger actually get. Homes in Arapahoe County, CO run heat about eight months a year, from October through May. A system that is undersized runs longer cycles to chase the thermostat, and the ignition system, burner, and heat exchanger accumulate wear at a rate a well-sized unit avoids. Contractors working installs here treat duct sealing and equipment selection as load questions, not defaults, because a marginal install has nowhere to hide across a calendar that is mostly heating season.
Ductwork sized for older equipment does not automatically carry a modern furnace at the volumes and static pressures a new unit demands. Half the homes in Arapahoe County, Colorado were built in 1986 or earlier (2020-2024 ACS 5-year). That means a contractor quoting a furnace here has to assess what the existing duct system was built around before a final scope takes shape. Electrical service is a separate check: the load a modern furnace draws on ignition and blower startup has to land within what the panel at that address actually has available. Both of those are physical conditions in the house, and both get confirmed on site.
What Gets Installed With a New Furnace
The furnace itself sits in a mechanical room, basement, or utility closet and is the unit a homeowner sees when they look at the system. Inside it, a heat exchanger and a burner assembly do the heating work, while a blower motor pushes the conditioned air out. A flue pipe runs from the unit to an exterior wall or roof to carry combustion gases out of the house.
A thermostat mounts on an interior wall and is the control point the household uses every day. The filter housing sits at the point where return air enters the furnace, and a contractor will fit the correct filter type to the unit being installed. Some installations also include a dedicated shutoff valve at the gas line connection near the furnace.
The drawing shows a typical layout, and a licensed contractor determines exactly which components apply to your home and how each one is positioned.
Get matched in Arapahoe CountyArapahoe County by the Numbers
360 severe weather events were recorded in Arapahoe 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 Arapahoe County, Colorado were built in 1986 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesArapahoe County, Colorado holds 269,345 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 64.7% of the occupied homes in Arapahoe County, Colorado (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules & Standards for Arapahoe County, Colorado4 sourced rules and standards
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 Arapahoe County
Colorado's climate puts real demands on heating equipment, and those demands vary by location. How hard a furnace has to work over its life is a local question, and the weather record for {county} is part of that answer.
360 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.