AC Installation & Replacement in Denver

Over 16,000 single-family homes were built in the 1940s, many of them small Minimal Traditional houses in neighborhoods like Harvey Park, Athmar Park, Westwood, and University Park. These are good candidates for central air: a basement furnace, short duct runs, and a simple floor plan. Most need extra return air, and many still have small electrical panels. A condenser needs its own 240-volt circuit, so we check the panel during the estimate.

Swamp coolers are common in these neighborhoods. Converting means sealing the roof or window opening and redesigning the return path, since the cooler pushed outside air through open windows.

On a 25- or 50-foot city lot, the condenser often ends up in a side yard a few feet from a neighbor's bedroom window. Placement affects noise, airflow, and inspection. We keep code clearances, avoid tight spots where the unit recirculates hot air, and confirm placement during permitting with Community Planning and Development.

The city has had three of the ten costliest U.S. hailstorms in 1990, 2009, and 2017, and even ordinary storms flatten coil fins. Keep condensers away from roof valleys and downspouts, and consider a hail guard.

Homes built since 2000, including the former Stapleton area, are reaching the age for first replacement. New split systems use R-454B or R-32, so the indoor coil is replaced as a matched pair. The minimum in DOE's North region is 13.4 SEER2 for a split AC and 14.3 SEER2 for a split heat pump. At 5,280 feet, capacity is reduced a bit by thin air, so we size with a Manual J rather than copying the old nameplate.

These homes were often built with tight, well-insulated envelopes and a single thermostat on the main floor. A load calculation commonly shows the original condenser was larger than needed, and a properly sized replacement with a variable-speed blower can even out the upstairs.

Xcel Energy supplies gas and electricity citywide and has offered rebates for qualifying heat pumps, not standard AC; confirm current amounts, which changed October 1, 2026. Denver has also run Climate Action Rebates for heat pumps, designed to stack with Xcel's, so check what is open. Colorado's 2026 air-source credit is $1,000, claimed by the contractor with at least $333 discounted to you, and Power Ahead Colorado pays $1,500 for cold-climate units filed before work begins.