Every year, Denver homeowners lose thousands to dishonest HVAC contractors. As a locally owned, NATE Certified company licensed in 8 counties, we've seen the damage these scams cause — and we've fixed the problems they leave behind. Here's what to watch for.
1. The "Cracked Heat Exchanger" Scare
This is the most common HVAC scam in Colorado. A technician tells you your heat exchanger is cracked and your furnace is leaking carbon monoxide, then quotes you $5,000+ for a full replacement. In many cases, the heat exchanger is fine. Always get a second opinion before agreeing to a heat exchanger replacement. A reputable company will show you the crack with a camera or mirror.
2. Bait-and-Switch Pricing
A company advertises a $49 tune-up, then the technician arrives and "finds" $800 in urgent repairs. Legitimate tune-ups cost $80–$150. If a deal seems too good to be true, it usually is.
3. Oversized System Recommendation
A dishonest contractor recommends a system that's too large for your home because bigger systems cost more. An oversized system short-cycles, wastes energy, and wears out faster. A proper installation always starts with a Manual J load calculation — if a contractor doesn't do one, walk away.
4. Unlicensed Contractors
Colorado requires HVAC contractors to hold a mechanical license in the county where they work. Unlicensed work can void your equipment warranty, violate building codes, and leave you liable for any damage. Always verify license numbers — On Time Heat & Air publicly displays all 8 of our county licenses.
5. "Refrigerant Is Banned" Pressure
Some contractors tell homeowners that R-410A refrigerant is banned and they must replace their entire AC system immediately. While R-410A is being phased down, it is still available and legal. Systems using R-410A will be serviceable for years to come.
6. No Written Estimate
Any contractor who won't give you a written estimate before starting work is a red flag. You should receive an itemized quote with parts, labor, and total cost before any work begins. On Time Heat & Air provides flat-rate pricing in writing on every job.
7. High-Pressure "Today Only" Deals
If a contractor says the price goes up tomorrow or the rebate expires today, that's pressure, not honesty. Real utility rebates have published deadlines you can verify online. Take your time, get multiple quotes, and check reviews.