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M and M Heating and Conditioning

Written by: Mickey C.

Date Published: Sep 16, 2025

I’ve used M and M several times in the previous years on my home and my rental properties. They’ve installed new furnaces and A/C, rewired an old house, and done interior and exterior electrical work. They repaired a furnace in one of my garages and done other large and small work for me over the years. They installed new furnaces and central A/C in my duplex rental. I always get excellent service and knowledgable help. One of my rental properties is over 100 years old, and they’ve made many improvements and updates for me over the years including some rewiring they did for me today. I’ve had many of their technicians and staff help me over the last 10 years and I’ve always been very satisfied with the quality of their work. I highly recommend them for heating & cooling, plumbing, and electrical work.





M and M Heating and Conditioning

Written by: Karen L.

Date Published: Jul 22, 2025

Once again M and M Heating & Cooling, Plumbing & Electrical has come to my rescue. My air conditioner wasn’t working well and in the middle of summer is NOT when you want to find this out. I scheduled an appointment online last night. I received a call this morning letting me know a technician would come on Thursday. Wow! I couldn’t believe they could get me in so quickly. I received a call later in the day letting me know that Brien Gienger would be able to get me taken care of today! Brien showed up and quickly assessed what the issue was with my A/C. He had the necessary parts to complete his service call and have me cool once again.
Thank you M and M!





M and M Heating and Conditioning

Written by: A C.

Date Published: Oct 11, 2024

We have had very bad experiences with other HVAC and rooter companies in the past. We are so glad we found M&M for our HVAC and plumbing needs. I really appreciate how patient and informative their tech Cody Gienger is answering all my boiler questions. Also, he seems to know that it’s better to maintain a boiler than replace it (we’ve had companies tell us it was going to die any minute and needed to be replaced or that it would die within a couple of years with no mention of maintenance or how best to extend the life of the boiler). This just adds to our appreciation of the fact that M&M has never tried to make us spend money unnecessarily, and we trust them. On the plumbing side, Abel Aragon saved us from blowing too much money on an expensive job with Elite Rooter, whose high pressure tactics and more expensive services I did not trust or like.





HVAC RepairPlumberAC InstallationHeating Service. Heating RepairAC Repair ∴ Johnstown, CO ∴ Longmont, CO ∴ Frederick, CO

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Word Around Town
I appreciate the honesty and integrity that he presented. Did not try to steer me in a direction that was not needed just to make a buck. I would recommend M and M just off that alone. That’s hard to...
Mike R.
As usual, the service was timely and Stephen does an exceptional job. Very customer oriented, and explains any issues in detail so you can make educated decisions. Have used M&M for many years and extremely pleased.
Michael G.
So far, so good! The tech, Will, who came out to evaluate our AC and Furnace was quick and efficient, and located the issues that two other well-reviewed local HVAC companies didn’t catch. He made clear recommendations on how we...
Ben W.
Working with Chad was really great. He understood our needs, explained what would need to be done to accomplish our needs. He produced a reasonable quote and we have scheduled the time to get the wok done. Easy as one,...
Ken R.
M and M replaced my 40 year old hot water baseboard boiler heater and zone valves. They did a great job. Professional and protected my new carpet. I would highly recommend them.
Brian W.
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