Furnace Installation & Replacement in Broomfield

Broomfield sits at about 5,348 feet, which means roughly a 21% derate. We size from a Manual J, then pick a furnace whose derated output covers it. For the many two-story and townhome floor plans built after 2000, a two-stage or modulating furnace often fits the load better than a single-stage unit sized for the coldest night.

Moving from 80% to condensing changes more than the furnace. The new unit needs two PVC pipes out a wall or roof and a condensate drain, and it stops using the chimney. If a gas water heater stays on that chimney or B-vent, the fuel gas code requires the remaining vent to be sized for that one appliance, which often means a liner. We include that in the quote instead of finding it at inspection.

Downslope winds near Rocky Flats are worth planning for too. We place sidewall terminations away from the prevailing wind and where they won't be buried by drifting snow.

Since January 1, 2026, new gas furnaces sold in Colorado must emit no more than 14 ng/J of NOx or be certified to the current ENERGY STAR version (97% AFUE in the North since July 31, 2026). Nothing requires you to remove a working furnace. When you do replace one, we confirm the model's compliance before ordering. The details are in our NOx rules guide.

The consolidated City and County of Broomfield lists furnaces among projects that require a permit, and contractors must hold a local license. We pull it and meet the inspector. Xcel Energy supplies gas. Most homes also get electricity from Xcel, though United Power serves some, and that affects which heat pump rebates you can use.

Broomfield has promoted a Switch Together heat pump group-buy, and heat pumps qualify for Colorado's $1,000 credit and Power Ahead Colorado's $1,500 cold-climate rebate. For homes with good ducts, a dual-fuel system keeps gas heat for the coldest nights.