The Heating, Air Conditioning and Plumbing Experts
Call Today - (720) 366-1512
  • 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

we need you! Help us get to Number 1!


We need you! Its time for the annual Longmont Times-Call Readers choice awards. We pride ourselves on being number 1 in service, support and equipment and we would love your help and your vote! Click here to vote for M and M Heating, Cooling and Plumbing.



BIG NEWS! We’re Growing! We Have A New Shop Expansion To Better Serve The Needs of Longmont!

Big news from the M and M Family. Our award winning Heating, Cooling, HVAC and Plumbing company has outgrown our shop on main st. We are proud to announce we have expanded into a brand new facility, purpose built to serve the need to Longmont and the Front Range. Our new home at 110  s Bowen Cir in Longmont allows M and M to not only expand our fleet, but also to start offing new services like drain cleaning, rooter, and basic plumbing. We have been serving the area for over 15 years and will continue to provide A+ service to all out clients. New address…same GREAT service!

Longmont furnace, air conditioning and plumbing service fleet.




No Credit? 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 16 Years of Satisfied Customers
  • Trained and Certified Technicians
  • Licensed and Insured
  • EPA Certified
  • 24/7 Emergency Service
  • Service and Repair all Brands
  • 5 Star Reviews



110 s Bowen Cir
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 us 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
  • Testimonials

    When I purchased my house I knew that the A/C, water heater and furnace were going to have to be replaced. I read many reviews and M and M had the most impressive list of satisfied customers. Also I had a personal referral from a family member that recommended them but I still got quotes from several contractors. Boy was I happy I chose Eric and his team. They were professional and up front about what was going to happen. 5 Stars!

    Scott F. - Yelp

    Boy are these guys fast, efficient and good! No BS, just straight forward and very friendly. Ten year old A/C seemed to be getting tired and I called to schedule a general maintenance service call, AKA check it all out, to make sure everything was good. I figured they'd schedule something in a few weeks as it wasn't an emergency. No, they had a reschedule with someone else and within an hour, someone was over looking at the unit. VERY HAPPY with their service will ONLY call them from now on!

    Shane C - Yelp

    They are easy to work with and go out of their way to give exceptional customer service. We got a new furnace in 2010 and even though the labor warranty was expired, they would not charge for a service call! - 5 Stars!

    Kirk W - Yelp