For most Denver-area homes, a high-efficiency gas furnace paired with central air conditioning remains the most practical and cost-effective heating solution — but heat pumps are a compelling and increasingly popular alternative, especially for homeowners interested in lower operating costs or electrification. The right answer depends on your home’s age and construction, your existing equipment and ductwork, your utility situation, and your budget. There’s no single best system for every home; there is a best system for your specific home, and a good contractor will help you figure out which one that is.

Why Gas Furnaces Are Still the Default in Denver

Natural gas is widely available across the Denver metro, and the infrastructure — meter, lines, and existing furnace ductwork — is already in place in the vast majority of homes built in the region. A high-efficiency gas furnace (90%+ AFUE) delivers fast, powerful heat even when outdoor temperatures drop well below zero, which matters during Colorado’s periodic severe cold snaps. They’re reliable, the repair and replacement ecosystem is very mature, and the installed cost is generally lower than a comparable heat pump system.

At Denver’s altitude of 5,280 feet, gas combustion is less efficient than at sea level because the air is thinner. Proper installation and altitude calibration by an experienced local contractor is essential to get rated performance. A furnace installed and tuned by a team that knows Colorado conditions will outperform one set up to sea-level defaults.

Heat Pumps in Colorado: More Viable Than You Might Think

Modern cold-climate heat pumps can operate efficiently down to outdoor temperatures of 0°F or below — which covers the vast majority of Denver winter days. Heat pumps work by moving heat from the outdoor air into the home (even cold air contains heat energy), which is inherently more efficient than generating heat by combustion. In moderate temperatures, a heat pump can deliver two to three units of heat energy for every unit of electricity consumed.

The primary tradeoff is performance during the most extreme cold events. On the handful of nights when Denver dips below -5°F or -10°F, heat pumps lose efficiency and may need to rely on supplemental electric resistance heat, which is expensive. A dual-fuel system — heat pump paired with a gas furnace backup — addresses this by using the heat pump for most of the season and switching to gas only when temperatures fall below a threshold where the gas furnace is more economical. This gives you the efficiency benefits of a heat pump for most of the year while keeping reliable gas heat as a backstop.

Ductless Mini-Splits: The Right Answer for Some Homes

For older homes without existing ductwork, additions, detached garages, or rooms that your central system struggles to heat and cool evenly, a ductless mini-split heat pump is often the best solution. Mini-splits heat and cool specific zones without any ductwork at all, so they’re ideal when installing ducts isn’t practical or cost-effective. They’re very energy efficient and give you room-by-room control.

Boilers: Older Technology That’s Still Worth Considering

Some Denver homes, particularly older ones, use hydronic boiler systems that heat water and distribute it through radiators or radiant floor tubing. Boiler heat has a reputation for being exceptionally comfortable — radiant heat warms surfaces and people rather than just the air. If you already have a boiler system and it’s working well, maintaining it can make more sense than converting to forced air. Done’s team services and repairs boilers as well as furnaces — learn more at our boiler repair page.

Key Factors to Discuss With Your Contractor

When evaluating which system is right for your home, your contractor should walk you through:

  • Your current ductwork condition and sizing (undersized ducts limit performance for any forced-air system)
  • Your electrical panel capacity (heat pumps and mini-splits require adequate amperage)
  • Your gas and electric rate structure and how it affects operating cost comparisons
  • Available rebates and incentives — Xcel Energy and federal tax credits can meaningfully offset the cost of a heat pump installation
  • Your home’s insulation and envelope quality (a well-insulated home benefits more from a heat pump’s efficiency)

Done’s team can walk you through all of these factors with a free in-home assessment and a transparent recommendation — not a push toward whatever has the highest margin. We offer financing options to make the right system financially accessible, whatever you decide.

Ready to talk through your options? Visit our heating services page or reach out to schedule a consultation. If you’re also considering a heat pump for year-round efficiency, our heat pump page covers what’s available and how the systems work in our climate.