KJ Thomas Mechanical has certified technicians to take care of your Furnace installation near Louisville CO.

Longmont

Your best choice for Furnace repair in Longmont, CO

Since 2007, KJ Thomas Mechanical is your best choice for repair, installation, and service in homes and buildings just like yours in the Boulder County. We take special pride in the craftsmen we train and employ--a fact you'll see in the reviews below. It's also noticeable immediately in the attitude and integrity our technicians bring to your job site. Our entire company works hard to make your experience with us hassle-free and enjoyable. You can also be assured that KJ Thomas Mechanical stands behind the work we do as well as complies with all local codes. This is why, as you can see by the map and reviews below, we are rated so highly for AC, Boiler, and Furnace Repair in Longmont, CO. Call us today at 303-435-8141!

Local reviews for AC, Boiler, and Furnace Repair in Longmont, CO.

Local Reviews
for Longmont, CO

Rated 4.9 out of 5 stars based on 19 customer reviews

Map of Longmont, CO

Incredibly helpful




My water heater started to go out right before I was headed for vacation. I called KJ Thomas Mechanical with my predicament and they worked with me to get a new water heater installed before I left. What a relief! I appreciated their willingness to work with me.


Map of Longmont, CO

Fantastic service even with unforeseen obstacles




Right from the first call to inquire about installing a new ventilation hood above our range, I felt assured by the warm professionalism which was reinforced at our consultation. The day of installation, after the giant microwave was removed, we found a small ledge from the cabinet protruding into the space where the hood was to go by 1/8 inch. Karl and his staff contacted someone who could shave off this ledge and we were able to proceed. Then, there was a heating duct in the wall that required maneuvering. Last, one of the switches on the hood was blown (defective on receipt) and we were unable to reach the manufacturer, these folks went to the local hardware store to find a workable option. My bill was extremely close to the estimate and much less than expected with these issues. I'm in the market for a house fan in the spring and will definitely contact this company.


Map of Longmont, CO

Excellent service. Would definitely use again.





Map of Longmont, CO

Very accommodating, great service!




Thank you for fixing my air conditioner over the summer and now inspecting and cleaning my furnace! Logan was on time, professional and gladly explained the service to me. Highly recommend KJThomas Mechanical!


Map of Longmont, CO

Great Company




Easy to contact. Return calls promptly. Easy to work with.


Map of Longmont, CO

Great service




Wouldn't have anyone but Karl service our furnace, he is the best!


Map of Longmont, CO

Good job




Very punctual polite, informative


Map of Longmont, CO

Great service, great price.





Map of Longmont, CO

Nicely done!




Logan located the problem and took care of it effectively. He also had good ideas to keep this issue from reoccurring .


Map of Longmont, CO

Good catch without a lecture!





KJ Mechanical is great!




Karl and his staff are very communicative and trustworthy.


Good Job




Karl is knows his business and is teaching his kids the trade which is admirable.


Terrific service!





Great Service, Awesome Price




We needed an A/C unit for our remodeled house. Karl was great to work with to find a unit that fit our budget and installed it within a day!! Great team, left the job site clean. I can't recommend him more. Wonderful experience.


Install New Tankless Water Heater/HVAC installations and repairs




We have been using KJ Thomas Mechanical for over 20 years and have had excellent service, quality installation and quick replies with questions and concerns. We highly recommend them. Karl and his Team, are courteous, and knowlegable with exhisting HVAC as well as the newest technology and units that are available to all homeowners. Karl will also discuss the options available for you and help to make the best decision for your home.


Great service




Came right out, did a great job, it works, yay


Saved us




AC went down on hottest day of year. Were here and up and running same morning as call for service. Awesome experience!


Great service and trustworthy people!




Wonderful, helpful and knowledgeable!


These Are Your Guys




These guys were great. The most affordable and reasonable price combined with great service. They installed central air conditioning in my home. They showed up on time and were neat and polite. I highly recommend them!


Ken M.

Ken M.

Furnace replacement

Near Judson St, Longmont, CO 80501
Longmont, CO - Furnace replacement
Logan B.

Logan B.

Performed exhaust hood install on Big Chill unit

Near Tyrrhenian Ct, Longmont, CO 80504
Longmont, CO - Performed exhaust hood install on Big Chill unit
Ken M.

Ken M.

Install trane s9v furnace, coil, and humidifier

Near 100 Year Party Ct, Longmont, CO 80504
Longmont, CO - Install trane s9v furnace, coil, and humidifier
Karl T.

Karl T.

Replace Honeywell zone damper in Niwot Colorado

Near Erin Ct, Longmont, CO 80503
Longmont, CO - Replace Honeywell zone damper in Niwot Colorado
Karl T.

Karl T.

Install steam humidifier and hepa filter.

Near Bella Vista Dr, Longmont, CO 80503
Longmont, CO - Install steam humidifier and hepa filter.
Logan B.

Logan B.

Performed furnace tuneup on Trane unit

Near Larkspur Dr, Longmont, CO 80503
Longmont, CO - Performed furnace tuneup on Trane unit
Logan B.

Logan B.

Performed furnace tuneup on Goodman unit

Near Larkspur Dr, Longmont, CO 80503
Logan B.

Logan B.

Performed furnace tuneup on Lennox unit

Near Larkspur Dr, Longmont, CO 80503
Karl T.

Karl T.

Replacing Sears water heater with an AO Smith water heater

Near Dodd Ln, Longmont, CO 80501
Logan B.

Logan B.

Performed water heater install on AO Smith unit

Near Larkspur Dr, Longmont, CO 80503
Longmont, CO - Performed water heater install on AO Smith unit
Logan B.

Logan B.

Performed furnace tuneup on Trane unit

Near Longmont, CO 80503
Ken M.

Ken M.

Removal Lennox furnace

Near Half Measures Dr, Longmont, CO 80504
Longmont, CO - Removal Lennox furnace
Tate N.

Tate N.

Moving furnace and water heater for water cleanup and restoration

Near Winding Dr, Longmont, CO 80504
Longmont, CO - Moving furnace and water heater for water cleanup and restoration
Logan B.

Logan B.

Performed furnace tuneup on York unit

Near Mt Sherman Rd, Longmont, CO 80503
Longmont, CO - Performed furnace tuneup on York unit
Karl T.

Karl T.

Sewer gas smell and replace furnace fan motor on Rheem furnace

Near Erin Ct, Longmont, CO 80503
Tate N.

Tate N.

Installation of new supply and return runs for a basement finish.

Near Lotus Ct, Longmont, CO 80504
Longmont, CO - Installation of new supply and return runs for a basement finish.
Logan B.

Logan B.

Performed furnace tuneup on Trane unit

Near 15th Ave, Longmont, CO 80501
Longmont, CO - Performed furnace tuneup on Trane unit
Ken M.

Ken M.

Install high efficiency trane furnace

Near Abbey Dr, Longmont, CO 80504
Tate N.

Tate N.

New Trane furnace install

Near 6th Ave, Longmont, CO 80501
Carlos C.

Carlos C.

Installed Trane furnace

Near Logan St, Longmont, CO 80501
Longmont, CO - Installed Trane furnace
Tate N.

Tate N.

Installation of a new return run.

Near Fountain Ct, Longmont, CO 80503
Longmont, CO - Installation of a new return run.
Tate N.

Tate N.

Installation of a Trane furnace and ac

Near Sunset Dr, Longmont, CO 80501
Tate N.

Tate N.

Installation of a Trane furnace and ac.

Near Sunset Dr, Longmont, CO 80501
Logan B.

Logan B.

Performed furnace tuneup on Trane unit

Near Woodridge Dr, Longmont, CO 80504
Longmont, CO - Performed furnace tuneup on Trane unit
Karl T.

Karl T.

Tune up Burnham boiler north Longmont

Near Caballo Ave, Longmont, CO 80504
Longmont, CO - Tune up Burnham boiler north Longmont
Logan B.

Logan B.

Performed furnace tuneup on Ruud unit

Near Trail Ridge Rd, Longmont, CO 80504
Longmont, CO - Performed furnace tuneup on Ruud unit
Logan B.

Logan B.

Performed furnace tuneup on Trane unit

Near Trail Ridge Rd, Longmont, CO 80504
Longmont, CO - Performed furnace tuneup on Trane unit
Logan B.

Logan B.

Near Trail Ridge Rd, Longmont, CO 80504
Longmont, CO -
Logan B.

Logan B.

Performed humidifier install on Trane unit

Near Alpine St, Longmont, CO 80504
Longmont, CO - Performed humidifier install on Trane unit
Karl T.

Karl T.

Replacing furnace and AC with new Trane system

Near Arezzo Dr, Longmont, CO 80503
Longmont, CO - Replacing furnace and AC with new Trane system
Logan B.

Logan B.

Performed furnace tuneup on Trane unit

Near Lakeshore Dr, Longmont, CO 80503
Longmont, CO - Performed furnace tuneup on Trane unit
Logan B.

Logan B.

Performed furnace tuneup on Trane unit

Near Lakeshore Dr, Longmont, CO 80503
Longmont, CO - Performed furnace tuneup on Trane unit
Karl T.

Karl T.

Replacing furnace and Ac Longmont

Near Arezzo Dr, Longmont, CO 80503
Ken M.

Ken M.

Installation trane xv furnace

Near Sparrow Hawk Dr, Longmont, CO 80504
Longmont, CO - Installation trane xv furnace
Karl T.

Karl T.

AC not not cooling

Near Trevarton Dr, Longmont, CO 80503
Longmont, CO - AC not not cooling
Karl T.

Karl T.

Triangle tube boiler repair

Near Trevarton Dr, Longmont, CO 80503
Longmont, CO - Triangle tube boiler repair
Logan B.

Logan B.

Performed flue repair on Trane unit

Near Ute Hwy, Longmont, CO 80503
Longmont, CO - Performed flue repair on Trane unit
Logan B.

Logan B.

Performed humidifier install on Trane unit

Near Columbia Dr, Longmont, CO 80503
Longmont, CO - Performed humidifier install on Trane unit
Logan B.

Logan B.

Performed furnace install on Trane unit

Near Whitehall Dr, Longmont, CO 80504
Longmont, CO - Performed furnace install on Trane unit
Logan B.

Logan B.

Performed furnace install on Trane unit

Near Whitehall Dr, Longmont, CO 80504
Ken M.

Ken M.

Install slantfin boiler

Near Yeager Dr, Longmont, CO 80501
Longmont, CO - Install slantfin boiler
Logan B.

Logan B.

Performed AC maintenance on Trane unit

Near Fox Hill Dr, Longmont, CO 80504
Longmont, CO - Performed AC maintenance on Trane unit
Logan B.

Logan B.

Performed AC repair on Lennox unit

Near Pace St, Longmont, CO 80504
Longmont, CO - Performed AC repair on Lennox unit
Ken M.

Ken M.

Ductless air conditioner

Near 6th Ave, Longmont, CO 80501
Longmont, CO - Ductless air conditioner
Ken M.

Ken M.

Ductless ac install

Near 6th Ave, Longmont, CO 80501
Longmont, CO - Ductless ac install
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Expert Service from People You Can Trust
6175 Trevarton Dr. Longmont, CO 80503
Not Open to Walk-in Traffic
PHONE:   303-435-8141
HOURS:   Monday - Friday: 8AM to 5PM
Expert Service from People You Can Trust
6175 Trevarton Dr. Longmont, CO 80503
Not Open to Walk-in Traffic
HOURS:   Monday - Friday: 8AM to 5PM
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For Furnace in Boulder CO, we accept most major credit cards.
 
We accept cash for Water Heater repair service provided in Longmont CO.
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