Furnace Installation & Replacement in Sherrelwood

The most common limit in these ranches is the return air. Many have one central grille feeding a furnace that now moves far more air than the original. A replacement is the cheapest moment to add a second return or enlarge the existing one, because the furnace cabinet and plenum are already open. It also lets us choose a variable-speed blower that runs quietly at lower speeds instead of a single-speed fan that roars through a small return.

We measure static pressure and temperature rise before and after, so you can see that the system is running within the manufacturer's range.

Under the state rule that started January 1, 2026, any new gas furnace sold must emit no more than 14 ng/J of NOx or carry the current ENERGY STAR label. For a closet furnace on an existing metal flue, an ultra-low NOx 80% model avoids cutting new holes through the roof or wall. For a basement furnace near an outside wall, a 97% condensing furnace with PVC venting and a condensate drain usually makes more sense.

Watch the water heater. In many of these houses it shares the flue with the furnace, and when the furnace switches to PVC, the water heater is left alone on a flue sized for two appliances. That can cause weak draft and condensation, so we test it and resize or line the vent when needed. Our NOx guide spells out what changed for homeowners.

Gas furnaces lose about 4% of their input for every 1,000 feet above sea level, so at 5,292 feet a properly set-up furnace delivers about 79% of its sea-level rating. Even so, many single-story ranches here have been fitted with more furnace than they need, especially after window replacements and attic insulation. We size from a Manual J and set the orifices and gas pressure for the altitude. A right-sized furnace runs longer, quieter cycles and keeps the house more even.

Sherrelwood is unincorporated, so furnace replacements are permitted through Adams County's Community and Economic Development Department, and the contractor must be registered with the county. We file the county paperwork and book the inspection for you.

If the air conditioner or swamp cooler is also due for replacement, a heat pump paired with the new furnace is worth a look. Adams County is a DRCOG member, so Power Ahead Colorado's $1,500 cold-climate rebate is available here. Our heat pump vs. furnace guide compares the options.