A dual-fuel (or “hybrid”) system combines a heat pump with a backup gas furnace. The heat pump handles cooling and most winter heating; the furnace takes over only when outdoor temperatures drop below the system’s balance point.
Why dual-fuel is often the best Colorado configuration
- Heat pump runs ~80-90% of heating hours at high efficiency
- Gas furnace covers the coldest 10-20% of hours when heat pump efficiency drops
- Lowest total operating cost across the season
- Comfort backup for extreme cold (sustained below 5°F)
- Often cheaper if your existing furnace is recent — keep it, add heat pump
- Qualifies for full heat pump rebate stack
How the switchover works
A dual-fuel-capable smart thermostat monitors outdoor temperature and switches between heat pump and furnace based on a configurable balance point — typically 15-30°F depending on your home and energy costs. Modern thermostats can even consider real-time energy prices.
When dual-fuel is especially smart
- You have a furnace under 8 years old — keep it
- You live in the foothills (Evergreen, Conifer, Bailey) where extreme cold happens
- You’re sensitive to gas-price volatility
- You want absolute reliability on the coldest nights
Related: Heat Pump, Cold-Climate Heat Pump, Balance Point, Smart Thermostat.
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Right Way Mechanical is a family-owned HVAC contractor serving Wheat Ridge, Arvada, west Denver, and the Colorado foothills.