How much does it cost to replace an AC system in Denver, CO?
Full AC system replacement in Denver, CO typically runs $6,500–$12,000 installed for a standard-efficiency system, including the outdoor unit, indoor coil, and labor. High-efficiency systems run $10,000–$16,000 but can cut cooling bills 20–40%. Quotes vary mostly on sizing and ductwork condition — get the load calculation, not just a tonnage guess.
What you can check yourself
- Ask each bidder for their load calculation (Manual J) — a quote without one is a guess.
- Compare like-for-like efficiency (SEER2 rating) across quotes.
- Ask about utility rebates and federal tax credits in the quote — good installers itemize them.
Typical cost
Typical installed range in Denver, CO: $6,500–$12,000 standard; $10,000–$16,000 high-efficiency. Ductwork replacement, if needed, adds $2,000–$5,000.
When to call a pro
This is a get-three-quotes job. The cheapest bid without a load calculation usually becomes the most expensive system you own.
HVAC pros in Denver, CO
- Motili · 1900 Wazee St #1533, Denver, CO · +18006699656
- US HVAC Home Service Denver · 1881 Curtis St #2C, Denver, CO · (719) 399-1053
- Pro HVAC Denver · 600 17th St, Denver, CO · +18003036170
- Aether Mechanical · 1630 Welton St, Denver, CO · +13034147770
- Med Air Pro · 290 Park Ave W #118, Denver, CO · (720) 369-7063
- Thermiq Services, Llc · 2590 Welton St Ste 200 Pmb 1010, Denver, CO · 13032183388
- Zero Homes · 3120 Blake St, Denver, CO · +13038488606
- Mile High Air Duct · 3200 W Colfax Ave, Denver, CO · +17204697519
Get free quotes from Denver, CO pros →
Data by Servik — verified local pros from official license records and public sources. Cost figures are typical ranges, not quotes; a pro's written estimate is the real number.