Xcel Energy rates have gone up in recent years, and Denver’s extreme temperature swings mean your HVAC system works hard almost year-round. The good news: most homeowners can cut their heating and cooling costs by 20–40% with a combination of free habits and smart upgrades. Here’s what actually works.
1. Change your air filter regularly (free)
A clogged filter forces your HVAC system to work harder, using more energy to push air through. A clean filter can reduce energy consumption by 5–15%. Replace 1-inch filters every 30 days, 4-inch filters every 3–6 months. Set a phone reminder — it’s the easiest energy savings you’ll ever get.
2. Use your thermostat strategically (free)
The Department of Energy says you can save about 1% on your bill for every degree you set back for 8 hours. In practice:
- Winter: Set to 68°F when home, 62°F when sleeping or away
- Summer: Set to 76°F when home, 82°F when away
If you have a programmable or smart thermostat, set these schedules and forget them. The system does the work.
3. Install a smart thermostat ($150–$300)
Smart thermostats like Nest, Ecobee, and Honeywell learn your schedule and adjust automatically. They also show you energy usage reports so you can spot waste. Most homeowners save 10–23% on heating and cooling bills. We install smart thermostats — including wiring, Wi-Fi setup, and a walkthrough of all the features.
4. Seal your ductwork ($300–$1,500)
Leaky ducts are one of the biggest hidden energy wasters in Denver homes. The average home loses 20–30% of conditioned air through duct leaks — you’re paying to heat or cool your attic, crawlspace, or walls. Duct sealing involves finding and sealing gaps with mastic or metal tape (not regular duct tape, which fails quickly). The energy savings typically pay for the service within 1–2 years.
5. Get your annual tune-up ($89–$150)
A well-maintained system runs 10–25% more efficiently than a neglected one. Professional maintenance catches small issues (like a dirty coil or weak capacitor) before they become expensive repairs. It also extends equipment life by 5–7 years on average. Think of it like an oil change for your HVAC system.
6. Add attic insulation ($1,000–$3,000)
Many Denver homes built before 2000 are under-insulated by today’s standards. Heat rises, so in winter a poorly insulated attic is like leaving a window open on the top floor. Colorado recommends R-49 to R-60 attic insulation. Adding blown-in insulation is one of the highest-ROI home improvements you can make — it reduces heating and cooling loads year-round.
7. Use ceiling fans correctly (free if you have them)
Most ceiling fans have a switch on the motor housing that changes rotation direction. In summer, run fans counterclockwise to create a downdraft (wind-chill effect lets you raise the thermostat 4°F without feeling warmer). In winter, run them clockwise on low speed to push warm air down from the ceiling. Turn fans off in empty rooms — they cool people, not rooms.
8. Close blinds and curtains strategically (free)
In summer, close blinds on south- and west-facing windows during the afternoon — solar heat gain through windows can add 3–5°F to indoor temps. In winter, open those same blinds during sunny days to get free solar heating, and close them at night to insulate.
9. Upgrade to a high-efficiency system (long-term)
If your furnace or AC is 15+ years old, it’s likely running at 60–80% of the efficiency of a modern system. Upgrading to a 96% AFUE furnace or a 16+ SEER AC can cut your heating and cooling costs by 30–40%. With financing from $79/month and tax credits up to $2,000 for heat pumps, the out-of-pocket cost is lower than most people expect.