Terrific experience overall. Furnace wasn't working this morning and they managed to get someone…read moreout same day. Very honest and quick to remedy the issue. Shout out to Tony who took care of the issue in no time. Very friendly, good guy, and looks like I found me new go-to for HVAC issues. Thank you guys! Jason

We would never go with anyone else... Circulating Air has been servicing our A/C system for years,…read moreand although it is old, they continue to give us honest and trusted advice for keeping the system healthy and operating, until we need to replace. Just cannot say enough about the integrity, efficiency and promptness of this company. They are also extremely reasonable with their pricing.

Steve and the rest of the crew went out of their way to help me in a very difficult situation. The…read moreservice , support, and value was outstanding. I would recommend them to anyone that's looking for any heating and air work . I've used many companies in northern Colorado but I will keep using them from now on.

They showed up in a timely manner the diagnosis was, as I suspected, a bad fan motor on the…read morecondenser coil. They wanted $880 to replace it with no warranty and said my unit was obsolete and they wanted me to instead spend $18k on a whole new system. Gtfoh..... I'm do it myself.

We have used this business off and on over the last 7 years and what I like most these days is that…read morewe have a really good understanding of my house and the issues that come up with it. I like that they track and document every service provided with photographs and that if they can send the same technician each time, they do so that person has a good memory of your situation with your home. They have always been prompt at returning calls and helping me figure out what I need. Even if their prices might be a wee bit high here and there, the peace of mind to know that we are being taken care of is worth it to me. I like knowing they have our house history, they have established a relationship with me over the years and I know that when they offer me options its not to just get all they can - there is a purposeful reason. If you are in a situation where you need an airtight service with a tracked repair history that you can look up in images etc, then this is a great place to call for assistance.

A furnace tune-up was requested. The tech did the tune up, found no issues, however, when the pushy…read moresales guy showed up, he tried to sell a new furnace AND air conditioner. The furnace is only 8 years old. Why would a new furnace, that works great, need to be replaced? Maybe because the customer was a 90 year old woman who was vulnerable. I will NEVER use M and M for anything again.

Easy to deal with and professional. Had them replace old…read moreA/C with a heat pump. Team did a great job

This is a great company to work with. Our boiler had gone out right after we receive our quote from…read moreJeremy for a new system. They were out in 2 days. Right before the 03/06/26 storm. Talk about just in the nick of time. Devon arrived first to start the removal of the old system, while hid partner Ruben went to pick up the new boiler. They worked solidly all day with nary a break. Clean, zero mess left behind. Small company (brother and sister run) with great prices. If needed, I will not hesitate to call them again.

Mark was here serving our furnaces and AC and did a great job, very professional and told us what…read morehe wanted to check out next year, and made couple suggestions. FAST EDDY OF Arvada

The folks at True Heating and Cooling took on a pretty big job of installing an extra unit to…read moreincrease the cooling capacity of my home; these Colorado summers are getting hotter every year! They did a wonderful job installing a ducted heat pump that would add cooling and heating to my upstairs bedrooms using discreet ceiling mounted ducts, with the efficiency of a large mini-split system. Jophrey came to my house to give me an estimate and within a day or two presented a few different options and explained their pros and cons. Once we had settled on an appropriate solution, they were able to start the work in a few days (I think they have same-day availability for emergencies, but there wasn't a rush on my job). The installers (Carlos, Daniel, Juan and Alex) reached out each day when they were on their way with a picture and identification so I knew when they were coming. They touched base at the start and end of each day to clarify the work they had done and answer any questions. They were always very courteous, polite and asked about any modifications in advance to always make sure I was going to be pleased with the final product. At the end of the job, the owner of the company, Justin, even came by to QC their work and walk me through the new system. I obtained five bids, and theirs was one of the most competitive. Good service, quality products and a reasonable price - what more could you ask for? They will absolutely be my vendor of choice for any HVAC work moving forward, and they should be for you too!

My water heater was leaking the next day after I returned home from a 2 weeks trip. I called CT…read moreHeating at 8 in the morning and spoke to Todd, he came out to my house at 10 and by noon I had a new water heater.

What a wonderful, prompt and thorough company. My husband…read morewas out of town, we had no heat. I called them at 8, Todd was here at 8:45 and found a tennis ball in our heating line. Fixed the issue and constructed it so if it happens again, it's much easier to repair. Best of all the price was very reasonable. I am sure the other bigger heating company would have charged twice the price and probably would have convinced me I needed a new furnace.

They got bought out by welzig. I did not have a good…read moreexperience with welzig. Technician was smelly. Did not diagnose correctly.

We highly recommend CMS- a family-owned business based in Longmont- for any hvac service or…read morereplacement! Brien's furnace replacement crew of Lawrence and Zach were very prompt, personable, and professional. They replaced our old 80%-efficiency furnace with a 95% Carrier model in less than 8 hours, made absolutely sure that everything was done right and to Boco code, and left no speck of debris or trash. To top it all off, Brien's bid was VERY competitive with all other bids, he helped us apply for an Xcel rebate, and he offers a 2% discount for payments by check. This is a great local business, you'll be glad you hired them! -Tim in Longmont

Austin was dispatched to my house from a warranty company. After doing a incomplete diagnosis, he…read moremade the incorrect determination that the condenser coils were dirty and that caused the compressor to burn out. He didn't look at the evaporator coils inside or even put gauges on the system to see how much refrigerant was left. Had he done that, he would have seen the oil stained hole in the evaporator coil and there was very little refrigerant left in the system. The low pressure was the reason the compressor wouldn't kick on, it wasn't even burned out. Due to his incorrect diagnosis, the warranty company denied my claim. He actually called me a retard!

Service is great! Billing is weird and hard to understand. So if you're ok with not understanding…read morewhy you're being billed so much outside the insurance than this is the right spot

SAC Mechanical replaced my home furnace and did a great job. I appreciate how incredibly…read moreresponsive and just downright nice they are. I really like it when I can find a local and high quality service company like this. Many thanks!

Our heater stopped working so we contacted SAC Mechanical and Stan was able to come to our house,…read morediagnose the issue and get the heater running again very quickly. He was prompt, professional, knowledgeable, friendly and courteous--5 stars!

Balazs from Foundations Mechanical came out and did a great job fixing my air conditioner. He was…read morecourtious, professional and honest. Highly recommend!

From the owner: Foundations Mechanical Services is a local and honest HVAC contractor. Ready to serve your everyday…read moreHVAC needs! Foundations services both commercial and residential customers as well as commercial refrigeration. We are properly insured to Colorado business standards.