When to Replace Your HVAC System

Every HVAC system eventually reaches the end of its useful life. Knowing when to replace versus repair can save you money and prevent uncomfortable surprises. Here's what Douglas County homeowners should know.

Average HVAC System Lifespan

Understanding how long HVAC equipment typically lasts helps you plan for replacement:

• Central air conditioners: 15-20 years
• Gas furnaces: 15-20 years
• Heat pumps: 10-15 years
• Boilers: 20-30 years

Note: Colorado's high altitude and extreme temperatures can reduce these lifespans. Systems here often work harder than in milder climates.

10 Signs It's Time to Replace Your HVAC

1. Age of Your System

If your furnace or AC is approaching or past 15 years old, start planning for replacement. Even if it's still working, efficiency has likely declined significantly.

2. Rising Energy Bills

A sudden increase in heating or cooling costs often indicates your system is losing efficiency. Compare your bills to previous years — if costs are rising without rate increases, your equipment may be struggling.

3. Frequent Repairs

The "50% rule" applies: if a repair costs more than 50% of the value of a new system, replacement usually makes more sense. Also consider if you've needed multiple repairs in the past two years.

4. Uneven Heating or Cooling

Hot and cold spots throughout your home indicate your system can't properly distribute conditioned air. This could be ductwork issues, but often points to an undersized or failing system.

5. Unusual Noises

Grinding, squealing, or banging noises aren't normal. While some sounds can be repaired, persistent noise often indicates worn-out components throughout the system.

6. Humidity Problems

Your HVAC should help maintain comfortable humidity levels. If your home feels too humid in summer or too dry in winter despite a working system, it may not be functioning properly.

7. Dust and Air Quality Issues

Excessive dust, increased allergy symptoms, or stale air can indicate your system isn't filtering and circulating air effectively.

8. R-22 Refrigerant

If your AC uses R-22 (Freon), replacement is recommended. R-22 was phased out in 2020, making repairs expensive and environmentally harmful.

9. Thermostat Struggles

If you're constantly adjusting the thermostat or your system can't maintain the set temperature, it may be losing capacity.

10. Increased Run Time

Systems that run constantly or cycle on and off frequently are working harder to maintain temperature — a sign of declining performance.

Benefits of a New HVAC System

• Energy savings: Modern systems are 20-40% more efficient than units from 15+ years ago
• Better comfort: More consistent temperatures and improved air quality
• Lower repair costs: New equipment warranty coverage
• Quieter operation: Today's systems are designed to run quietly
• Smart features: Compatibility with smart thermostats and zoning
• Environmental impact: Reduced energy use and eco-friendly refrigerants

Repair vs. Replace Decision Guide

Consider repair if:

• System is less than 10 years old
• Repair cost is less than $500
• This is the first major repair
• System has been well-maintained

Consider replacement if:

• System is more than 15 years old
• Repair costs exceed 50% of new system cost
• Multiple repairs needed in past 2 years
• Energy bills have significantly increased
• System uses R-22 refrigerant