Heating and Cooling Denver

At Major we have developed lifelong relationships with thousands of homeowners since 1970 providing heating and cooling repair and maintenance in Denver. Much of our growth is through referrals from heating and cooling repair customers. These relationships are built on trust, quality service, and caring about people and their families.

All of our NATE-certified Home Comfort Specialists are highly trained and enjoy their profession. They arrive ready to answer questions and prepared to solve any problems!

Call 303-424-1622 (M-F 7am – 5pm)
or Schedule Your Appointment Online 
24/7 Emergency Service

We are the only Home Comfort Specialists in the country providing the Major Service System™.

  • We send a highly-trained, polite & respectful professional to your home.
  • We provide a knowledgeable, straight-forward evaluation of your current system(s).
  • We provide clearly explained options & costs.
  • We do the approved heating and cooling repair work right the first time.
  • We show you what we have done and test the system with you.
  • We do not leave until you are 100% satisfied.
  • We stand behind our work.
  • We provide proactive maintenance through a Comfort Assurance Program.

Major is a fully licensed and insured heating and cooling repair company. We have experience with just about every type and brand of heating and cooling system in the marketplace, including energy efficient systems and geothermal.

If your heat goes out on Christmas Eve, you better believe our 24/7 Home Comfort Specialist will be there to save the day!


Denver Heating and Cooling Maintenance

Would you drive your car over 100,000 miles without an oil change? Of course not! Heating and cooling services work similarly.

Just like your car, heating and cooling systems are complex, mechanical systems. They need to be regularly maintained to insure they are running as efficiently and reliably as possible. Let’s face it, Denver heating and cooling systems can take a beating with the temperature variance we can experience one day to the next.

A small investment in annual system maintenance ensures your system will work as designed and will provide you and your family with the peace of mind that your heating and cooling system is prepared to tackle anything that Mother Earth throws at it!


  • Improves system performance
  • Reduce energy costs
  • Significantly extends the life of your heating and cooling system
  • Increases energy efficiency
  • Helps prevent costly and unexpected breakdowns
  • Improve the safety of your system


Our Annual System Maintenance is the perfect Denver heating and cooling maintenance program. This program provides homeowners and families with:

  • Proactive maintenance reminders – you don’t need to do a thing
  • Complete system checks to ensure your safety and comfort
  • Home comfort enhancement information – instant hot water, home automation, etc…
  • Discounts on any additional services

Furnace – Annual

  • Complete furnace or boiler tune-up
  • Test for leaks
  • Inspect belts and circuits
  • Lubricate any moving parts
  • Check your thermostat

Air Conditioner – Annual

  • Complete Air Conditioner tune-up
  • Check refrigerant levels
  • Check compressor & lines
  • Lubricate any moving parts
  • Check your thermostat

Furnace & Air Conditioner

  • Everything Above
  • Additional Discount – 10% Labor for any additional calls


  • Complete Boiler tune up
  • Light cleaning
  • Check pressures
  • Check pumps
  • Check expansion tank, zone valves, air separators


  • Complete Geothermal tune up
  • Light cleaning
  • Check water loop
  • Check motors
  • Check refrigerant levels


  • Complete Swamp Cooler tune up
  • Light cleaning
  • Check for leaks
  • Check motors
  • Check belts and floats
  • Start up / shut down for season

Call 303-424-1622 (M-F 7am – 5pm)
or Schedule Your Appointment Online 
24/7 Emergency Service