Trust the #1 Rated and Certified - A/C, Heating and Plumbing Experts
  • Services

    • Air Conditioning Service
    • Furnace Service
    • Plumbing
    • Maintenance
  • Heating and Furnace

    • Furnace Installs
    • Furnace Repair
    • Carrier Furnaces
    • Heating Repairs
  • Air Conditioning

    • Air Conditioning Installs
    • Air Conditioning Repair
    • Carrier A/C Units
  • Commercial

    • Commercial Heating
    • Commercial A/C

 Voted the #1 Heating & A/C Service AND Plumbing Service in Longmont!

With over 18 years of serving you, we are proud to be voted “Readers Choice” for heating / air conditioning AND plumbing. Our team is committed to giving you A+ service – so give us a call and let us work for you!

New Financing Program

No Crenocreditcheckdit? No Problem! M and M Heating, Cooling, Plumbing can now finance. Ready to get that new system? Apply Today or Learn More!



We’re Serving The Heating, Cooling and Plumbing Needs of Longmont and beyond.

M and M Heating and Air Conditioning is the leading choice for installation and repair and service for heating, cooling and plumbing in Longmont, CO. We are dedicated to our craft and each technician holds multiple certifications.  We have solutions for Longmont furnace and A/C installation, minor and major repair services, and maintenance programs to keep your HVAC system in the best working condition for all of the seasons. Contact us today, and let us know how we can help you!

When you need a Longmont Colorado HVAC / Plumbing company that you can rely on, call M and M Heating, Cooling and Plumbing. Our company is dedicated to providing all of our customers with high-quality, efficient, and affordable service that they can depend on. M and M consider it an honor when a customer trusts us to work on their AC system. Whether you have a small issue or an extensive repair, you can trust that we will get the job done right the first time. We have built our reputation on providing our customers with the best service and support the HVAC industry has to offer.


Straight Forward Longmont Heating, Cooling and Plumbing Service

At M and M Heating, Cooling and Plumbing we are dedicated to providing the most complete service possible. By serving all major brands, we have the tools, and knowledge to service, repair or install the system that meets your households needs.
 We Provide Longmont HVAC services including:

Air Conditioning
Swamp Coolers
Indoor Air Quality
Commercial HVAC Services

Now Offering Plumbing Services!


  • Locally Owned and Family Operated
  • Over 18 Years of Satisfied Customers
  • Trained and Certified Technicians
  • Licensed and Insured
  • EPA Certified
  • 24/7 Emergency Service
  • We Service and Repair all Brands
  • NATE and Carrier Certified

110 South Bowen Circle
80501 Longmont


  • 720-366-1512

Email address



Longmont Colorado heating, air conditioning and plumbing experts. Specializing in furnace repair, installations, and service as well as air conditioning repair, installations, and service. We now offer plumbing and rooter services. Give our certified team a call today!

Opening hours

Monday7:00 - 5:00
Tuesday7:00 - 5:00
Wednesday7:00 - 5:00
Thursday7:00 - 5:00
Friday7:00 - 5:00
» get directions on Google Maps