Our Home Comfort Specialists with the Major Service System™ customize residential heating and cooling solutions to fit your unique Colorado lifestyle.

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With 40+ years of experience, we are the only Commercial HVAC Specialists with the Major Service System™ that customizes solutions to your facility.

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We are the most respected Geothermal experts in the Rocky Mountain Region with over 1,000 systems currently operating as designed!

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Denver HVAC Company

We Believe in Doing the Job Right!

Since 1970, Major Heating and Air Conditioning has been providing quality heating and air conditioning to Colorado’s residents and facility managers. And today, we also provide renewable Geothermal for both residential and commercial projects. We strive to provide our customers with high quality customer service and products at an exceptional value. Our technicians are proficient in up-to-date system installation and service techniques. We take great pride in providing the Denver metro area with quality installations of new equipment and servicing existing heating and cooling systems. We specialize in everything that heats, cools, or looks like it does! We are proud members of the Better Business Bureau, with an A+ rating since 1983.

At a Glance

  • A + Rating with the BBB
  • Premier heating and air conditioning installation and servicing
  • Free estimates on new equipment
  • Customized maintenance plans
  • 24-hour Emergency service
  • EPA, LEED, and NATE certified technicians
  • Over 40 years of industry experience

Customer Reviews

”Their values are aligned with our values…“

MKK enjoys working with Major because of many reasons, but I think the most important reason is because their values are aligned with our values. The number one priority is to “Do the Right Thing.” Major is always looking out for the best interests of the client!

Craig Watts, LEED AP, Principal at MKK Engineering
”Absolutely amazing service!“

Absolutely amazing service. Our heater went out, they had somebody come immediately, fix furnace, and installed a new thermostat in no time.  I’m a renter, but my landlord said to pretty much blank-check the repair, and they were very honest, and did their best still to save us $$ on the repair at every turn.  They were done with everything within an hour. Would recommend to anybody!

Nam L., Littleton, Colorado
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