Furnace Repair & Service
By Carroll Mechanical Services
Carroll Mechanical Services is your trusted local expert for furnace repair and service near Longmont, CO. Our skilled technicians provide reliable solutions to keep your furnace running efficiently when it's cold outside. Whether you're dealing with unexpected breakdowns or need a seasonal tune-up, we ensure your home stays warm and comfortable.
What Does The Process Look Like?

Book An Appointment
To start the process, book an appointment for furnace repair and service with us by scheduling online or giving us a call.

Evaluation & Estimate
A certified technician will thoroughly inspect your furnace to identify any issues. After the evaluation, they will provide a detailed estimate outlining the necessary repairs and costs before beginning any work.

Perform Service or Repair
Necessary repairs or service are performed by a certified technician to restore your furnace's efficiency and performance. With their furnace expertise and the high-quality parts they use, rest assured your furnace will provide reliable operation.
Other Services We Provide

Air Conditioner Repair & Service
We offer professional AC repair and service to keep your air conditioner running efficiently and reliably. Our technicians diagnose issues, perform necessary repairs, and ensure optimal performance for your home’s comfort.

Annual HVAC Maintenance
We provide annual HVAC maintenance to keep your heating and cooling system running efficiently year-round. Regular tune-ups help prevent breakdowns, can improve energy efficiency, and extend the lifespan of your heating and cooling equipment.

HVAC System Installation
Let us ensure reliable comfort and energy efficiency for your home with professional HVAC system installation. We offer high-quality Carrier equipment, precise HVAC installation, and customized solutions to meet your heating and cooling needs.
Trusted HVAC Professional in Longmont
Great locally owned/operated business!
March 23, 2025
Excellent communication and work from Carroll Mechanical, we have needed no follow-up service whatsoever since the installation. Would use their services again and have recommended them to others. We like using locally-owned/operated businesses!
TIM
Expertise (5)
Solve Problems (5)
Service (5)
New furnace from Carroll Mechanical Service
February 15, 2024
Carroll Mechanical Service is always professional, knowledgeable and timely.
SANDY
Expertise (5)
Service (5)
Solve Problems (5)
Excellent Service
December 01, 2023
Prompt , Dependable , Knowledgable and great sense of responsiveness
PRADEEP
Expertise (5)
Service (5)
Solve Problems (5)
New AC and water heater
June 11, 2022
Carrier team were amazing. Besides doing a great job installing new AC, they corrected shoddy work from previous furnace company.
JOHN
Expertise (5)
Service (5)
Solve Problems (5)
Great work by a local company
April 26, 2022
Great work
BEN
Expertise (5)
Service (5)
Solve Problems (5)
Great Experience with Carroll Mechanical Services
April 13, 2022
Very professional staff from sales to scheduling to installation. They did exactly what they committed to at the timing they projected. The office staff even registered my equipment with Carrier to ensure I got the extended warranty. I endeavored to get project estimates from three other local contractors, and the difference between them and CMS in terms of responsiveness, thoroughness, and follow\-through was night and day.
Steve
Expertise (5)
Service (5)
Solve Problems (5)
Great service.
March 30, 2022
Very good people to work with.
KARIN
Expertise (5)
Service (5)
Solve Problems (5)
Absolutely happy with our service.
June 24, 2021
We picked CMS because they had the best price with top of the line equipment out of the 4 bids we got. Everyone was polite and worked hard. The guys were happy to answer any questions and make sure we understood what each piece of equipment did and how to use it.
CAMERON
Expertise (5)
Service (5)
Solve Problems (5)
Great work
June 13, 2021
Installation of our furnace and AC units went very smoothly. Showed up on time, all the work was completed that day, precautions were taken to keep the carpets clean and such. Everyone was professional and seemed to enjoy what they were doing. Was a great experience and we will for sure continue to use Carroll Mechanical for our needs.
TOM
Expertise (5)
Service (5)
Solve Problems (5)
The Best!
March 05, 2021
The estimate, The expertise, and the craftsmanship were all outstanding. I feel like Ive finally moved into the 21st century!
KEN
Expertise (5)
Service (5)
Solve Problems (5)
Very good
February 27, 2021
Humidity works, knowledgeable, service men
ERIC
Expertise (5)
Service (5)
Solve Problems (5)
System replacement
February 02, 2021
Knowledgeable and professional
BILL
Expertise (5)
Service (5)
Solve Problems (5)
humidifier installation
January 20, 2021
extremely happy with the service, type of unit and the staff
STEVE
Expertise (5)
Service (5)
Solve Problems (5)
Excellent service
December 15, 2020
Quick and competent installation. Fair price.
JEFF
Expertise (5)
Service (5)
Solve Problems (5)
Install was great and on time.
December 15, 2020
excellent service
KARLA
Expertise (5)
Service (5)
Solve Problems (5)
Great service, professional installation, reasonable prices
July 27, 2020
CMS did a great job installing our new Carrier A/C unit. Very pleased with their work and service.
DAIVD
Expertise (5)
Service (5)
Solve Problems (5)
Great Service!
June 12, 2020
Reliable company, very pleased with the workmanship!
VAL
Expertise (5)
Service (5)
Solve Problems (5)
Quality
March 19, 2020
Brien and his entire staff are the class of Longmont. I've had several companies out to diagnose an air flow problem with no success. Brien and Andy spent a couple hours here and found a solution. They care!!
DAVID
Expertise (5)
Service (5)
Solve Problems (5)
PROFESSIONAL, CLEAN, A+ SERVICE
December 11, 2019
From the start to the finish I was very pleased with their work. Brien came quickly to bid the job and his team did an excellent job. Office staff was extremely helpful and polite! Thank you, CMS!
LANCE
Expertise (5)
Service (5)
Solve Problems (5)
Prompt and professional
November 16, 2019
Fair, honest, knowledgeable and way above the rest in experience, very satisfied.
VAL
Expertise (5)
Service (5)
Solve Problems (5)
Top Quality Service
October 07, 2019
Dad is 88 years old and I am his daughter /care taker/go to person. From the beginning talking with office gals, assessment of his furnace to the install everything was handled in a fast timely manner with expert service. Thank you all!
DIXIE
Expertise (5)
Service (5)
Solve Problems (5)
Great experience with Carroll Mechanical Services!
September 09, 2019
Carroll Mechanical Services came out and replaced my entire air conditioning unit. Their prices were much less expensive than other outfits I explored and their customer service was excellent. I met the owner, Brien, on site and walked through the pricing and installation. It was great to meet and talk with the owner. CMS does things the right way and I would recommend them to anyone looking for an honest bid from a company with excellent customer service.
WILL
Expertise (5)
Service (5)
Solve Problems (5)
Insstalling single head duckless mini split in our basement.
August 22, 2019
Our entire process of getting more heat to the basement has been excellent. Courteous, prompt and very professional.
LUTHER
Expertise (5)
Service (5)
Solve Problems (5)
Professional and Complete
August 12, 2019
Seemless and on\-time.
William
Expertise (5)
Service (5)
Solve Problems (5)
Experts
May 08, 2019
Nice team of people. During the install and they were polite and easy to chat with. Everyone on the team was easy to communicate to about the design, and were on my side about installing in way that was least disruptive to my house.
Anna
Expertise (5)
Service (5)
Solve Problems (5)
Best of the Best
March 05, 2019
The install of my new furnace was performed professionally and quickly. Everyone was competent, polite, helpful, and careful. Very pleased with the outcome.
Kathleen
Expertise (5)
Service (5)
Solve Problems (5)
Furnace installation
December 31, 2018
Carroll service was top notch, clean and efficient. I would recommend them to anyone needing heat and air service.
Emily
Expertise (5)
Service (5)
Solve Problems (5)
Furnace & Air condition installation
September 21, 2018
Excellent Service
Katherine
Expertise (5)
Service (5)
Solve Problems (5)
Great to deal with
August 23, 2018
Even though they are very busy they want to help the customer as much as possible.
MICHELLE
Expertise (5)
Service (5)
Solve Problems (5)
Very Good Service
August 28, 2017
Awesome Service and quick/efficient working. Love these guys !
Anand
Expertise (5)
Service (5)
Solve Problems (5)
Carroll Mechanical did a great job
July 07, 2017
Carroll Mechanical serviced my evaporative cooler and furnace for many years. They have always been prompt, fair, and provided great service. When I decided to covert to central air there was no question who I was going to hire. And once again I am a very satisfied customer.
Julie
Expertise (5)
Service (5)
Solve Problems (5)
Recommend without reservations
September 16, 2016
Brien installed a new A/C and brought the system up to code. He was great to work with. Great pricing, and he did a solid job. I would definitely recommend again.
Jill
Expertise (5)
Service (5)
Solve Problems (5)
Great sales and install experience.
August 27, 2016
Brien was amazing. Very detailed and took the time to answer all my questions at every step.
Steve
Expertise (5)
Service (5)
Solve Problems (5)