How to Choose an HVAC Contractor in Denver (2025)
Denver's extreme temperature swings — from -20°F winters to 100°F summers — make your HVAC system one of the most critical systems in your home. Choosing the right contractor ensures your system is properly sized, installed, and maintained.
Find HVAC Contractors in DenverKey Takeaways
- 1Look for NATE certification and Colorado mechanical license
- 2Proper sizing requires a Manual J calculation — not a guess
- 3Denver altitude affects furnace output — ensure contractor accounts for this
- 4Ask about Xcel Energy rebates for high-efficiency systems
- 5Get quotes that include model numbers so you can compare apples to apples
Required Certifications and Licenses
Colorado requires HVAC contractors to hold a state mechanical license. Look for NATE (North American Technician Excellence) certification — the industry's most respected credential. EPA 608 certification is required for anyone handling refrigerants.
For new system installations, ask if the contractor performs Manual J load calculations — this is the industry standard for properly sizing HVAC equipment to your home.
High-Altitude HVAC Considerations
Denver's elevation (5,280 ft) affects HVAC performance. Gas furnaces must be derated for altitude — a furnace rated at 100,000 BTU at sea level produces about 80,000 BTU in Denver. A qualified contractor will account for this in equipment selection.
Denver's dry climate also makes whole-home humidifiers a valuable addition to any HVAC system — ask your contractor about this during any heating system work.
Questions to Ask an HVAC Contractor
1. Are you NATE-certified? 2. Do you perform Manual J load calculations for new installs? 3. What brands do you carry and what are your manufacturer relationships? 4. Do you offer maintenance plans? 5. What is your response time for emergency service calls? 6. Are you familiar with Xcel Energy rebate programs? 7. What warranty do you offer on parts and labor?
Understanding HVAC Quotes
HVAC quotes should specify: equipment brand and model number, SEER rating (efficiency), BTU capacity, installation scope, permit fees, and warranty terms. Be wary of contractors who quote a system without visiting your home — proper sizing requires a site visit.
Frequently Asked Questions
How often should I service my HVAC in Denver?
Annual service is recommended — furnace in fall, AC in spring. Denver's dry air also makes humidifier maintenance important.
Are there rebates for new HVAC systems in Denver?
Yes. Xcel Energy offers rebates for qualifying high-efficiency systems. Your contractor can identify eligible equipment.
What size HVAC system do I need for my Denver home?
Sizing depends on square footage, insulation, and ceiling height. A licensed contractor performs a Manual J load calculation.
How long does an HVAC installation take?
A standard furnace or AC replacement takes 4–8 hours. A full system replacement (furnace + AC) typically takes 1–2 days.
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