Air Conditioners
Air Conditioning Services


Carroll Mechanical Services offers quality air conditioner installation of Carrier brand systems. We also repair and service all brands of air conditioning systems throughout Longmont, CO, and the surrounding communities. We pride ourselves on timely, high-quality service at a competitive price, which is why we're recognized by many as the best HVAC company to partner with for your needs!

New AC Systems
If you are looking for a new Carrier brand air conditioning system, there are several options from which to choose. Carroll Mechanical Services has extensive experience with air conditioner installation and can help you choose a system that best meets your individual requirements. The size, number of rooms, internal square footage, temperature needs, as well as local utility rebate programs, are all key factors that help determine the best system to meet your needs. Whether you're considering a new air conditioner installation or an air conditioner replacement, we can help guide your decision.
Carroll Mechanical Services is a certified Carrier brand heating, air conditioning, and cooling system installer. We can assist you in selecting the best system for your Longmont-area home or local business. When you choose us, you're choosing the best HVAC company in Longmont, CO.

Air Conditioner Inspection
Our 24×7 service includes some of the best warranties in the industry, including superior labor guarantees.
We provide a 24-point AC maintenance inspection for your air conditioner, followed up with any repair recommendations that may be needed:
Inspect Expansion Valve
Inspect and Clean Evaporator Drain
Inspect and Adjust Bypass Humidifier Dampers
Inspect Thermostat
Inspect Thermostat Selector
Inspect Circuit Breaker
Inspect Temperature Across the Evaporator
Inspect and Check Condenser Cabinet
Inspect Condenser Drain Pan
Inspect Fins on Outside Condenser
Inspect Condenser Coil
Inspect and Oil Condenser Fan Motor
Inspect Voltage and Amperage on Motors
Inspect Fan Blades for Tightness and Pitch
Inspect Start and Run Relays and Contacts
Inspect Temperature Across Condenser Coils
Inspect Wiring
Inspect Head Pressure
Inspect Refrigerant Lines
Inspect Safety Pressure Sensors
Add Refrigerant
Inspect Filter
Inspect Duct
Advise Customer of Results of Check
Choosing Carroll Mechanical Services means you're choosing a team of HVAC experts who prioritize your comfort and satisfaction. Our competitive pricing, expert advice, and comprehensive services make us the ideal partner for your HVAC needs. Don’t just take our word for it – let our satisfied customers share their experiences!

Peace of Mind
As a home or business owner, the last thing you want to worry about is the comfort and safety of your air conditioning system. Nothing is more frustrating or sometimes stressful than a compromised heating or cooling system during Colorado's extreme weather conditions.
What our customers are saying
The Guys Were Great
"The guys who came to my house to do the repair were great. They were able to diagnose an issue and worked with Carrier to get it covered under warranty. I have had lots of issues with my furnace, I wish I would have started with them!"
- Fisherman
Very Happy
"I wanted to be sure to leave a review because I’m very happy with the work and equipment I received by CMS. I had Dominic come out to look at my furnace, which wasn’t working. We tried a few parts to try to keep my furnace working but it was over 20+ years old and needed to get replaced. Aj came over and gave me and my wife a fair quote and we scheduled install of our new Carrier furnace. Dario was the tech who came to install our furnace. I needed him to come a little early because I was recently in a car accident and needed to go to my doctor. He came early was very respectful and installed my equipment in no time. He cleaned up the area where the old furnace was and the new furnace was installed wonderfully and is currently warming my home in the cold weather we have been having . The front end was very responsive and helpful at getting my furnace checked out and they didn’t give me the run around as I’ve had with other companies . Nikki and Janis were amazing and worked with my busy schedule . They were one of the best company’s I’ve ever worked with and wanted to leave this review In hopes that helps you if your looking to have someone to come out and resolve your heating or cooling issue . Happy holidays"
- Zeke R.
Could Have Taken Advantage, But Didn't
"These guys are great! Solid, skilled, courteous, and dependable. I'm so grateful for the customer service the provide. They stand by their work and go above and beyond. Lawrence, the tech, is amazing! He really knows his stuff and leaves no stone unturned. Brien Carroll is a trustworthy and reliable owner. Nicki and Janis in the office are also on top things, friendly, and helpful. Love this local company!"
- Caitlin H.
Ready to get started?
Carroll Mechanical Services of Longmont provides top-quality HVAC equipment, parts, and AC maintenance services 24/7 that you can trust. Whether you’re in need of air conditioner replacement, routine AC maintenance, or a full air conditioner installation, we’re here to keep you comfortable and worry-free — all from the best HVAC company in Longmont, CO.