Common HVAC Problems in Denver Homes & How to Fix Them
Many homeowners face HVAC problems in Denver, especially during extreme weather changes. But when your furnace stops blowing hot air or your AC isn’t cooling, it can be frustrating—and costly. Below, we’ll cover the most common HVAC problems in Denver and how to fix them before they turn into expensive repairs.

1. Furnace Not Blowing Hot Air? Here’s How to Fix It
Why Do HVAC Problems in Denver Happen More Often in Winter?
Denver's cold winters put extra strain on heating systems.
High altitude can impact furnace efficiency.
Dry air causes dust buildup, which clogs filters.
Fixes for a Furnace That’s Not Blowing Hot Air:
✅ Replace dirty air filters.
✅ Check the thermostat settings.
✅ Relight the pilot light if it’s out.
✅ Call an HVAC technician if the furnace won’t turn on.
2. AC Not Cooling? How to Fix Common Denver HVAC Problems
DIY Fixes vs. Professional Repairs for Denver HVAC Problems
Some cooling issues are easy to fix, while others require professional help.
DIY Fixes:
✅ Clean debris from the outdoor AC unit.
✅ Seal air leaks around windows and doors.
✅ Replace the thermostat batteries.
When to Call an HVAC Technician:
❌ AC unit is blowing warm air.
❌ System is leaking refrigerant.
❌ Energy bills are unusually high.
3. Uneven Heating or Cooling? Here’s What Denver Homeowners Should Do
Signs You Need an HVAC Technician for Common HVAC Issues in Denver
Some rooms are too hot or too cold compared to others.
Air vents aren’t pushing out enough air.
HVAC system turns on and off too frequently (short cycling).
How to Fix It:
✅ Make sure all air vents are open.
✅ Seal duct leaks with HVAC tape.
✅ Upgrade to a zoning system for better temperature control.
4. Strange Noises Coming from Your HVAC System? Here’s What They Mean
Banging or rattling: Loose or broken components.
Whistling or hissing: Duct leaks or refrigerant issues.
Squealing: Worn-out blower motor belts.
Clicking: Electrical relay problems.
✅ Solution: Tighten screws, check ducts for leaks, and schedule a professional inspection if needed.
5. High Energy Bills? Your HVAC System Could Be the Problem
Old or inefficient HVAC equipment struggles to keep up.
Dirty filters and clogged ducts make the system work harder.
Poor insulation allows heat to escape in winter and cool air to leak in summer.
✅ Solution:
Replace air filters regularly.
Upgrade to an energy-efficient HVAC system.
Seal windows and doors to prevent energy loss.
Preventative Maintenance: How to Avoid HVAC Problems in Denver
The best way to avoid costly repairs is with regular HVAC maintenance.
✅ Schedule a fall furnace tune-up before winter.
✅ Get an AC inspection in the spring to prevent summer breakdowns.
✅ Change air filters every 1-3 months to keep airflow strong.
When to Call a Professional for Denver HVAC Problems
While some issues can be fixed with simple maintenance, others require expert attention.
📌 Call an HVAC professional if you experience:
No heat or cooling despite troubleshooting.
Refrigerant leaks or frozen AC coils.
Short cycling or system shutting off randomly.
Unusual burning or musty smells from vents.
At Hartzell Heating & Air, we specialize in keeping Denver homes comfortable year-round. If you’re experiencing HVAC problems, schedule a service appointment today!
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