KJ Thomas Mechanical
KJ Thomas Mechanical is a family-owned HVAC company based in Longmont, Colorado, serving Boulder County since 1995. Karl Thomas started the company with one truck and still walks jobs today, and decision-making stays in the family rather than with a corporate call center. The crew installs and services heat pumps, high-efficiency gas furnaces, air conditioning, and ductless mini-splits, and also handles seasonal maintenance tune-ups, detailed diagnostics and repair, whole-home humidifiers, and air purification with media filters, UV, and air cleaners. Most installs use high-efficiency Trane equipment, paired with Mitsubishi mini-splits when zoned comfort or a retrofit makes sense. Work covers homes, townhomes, rentals, and additions as well as light commercial spaces such as studios, tenant finishes, boutique retail, small offices, restaurants, and light warehouses, including rooftop unit replacements and ducted zoning. The company also offers residential and light commercial plumbing for water heaters, boilers, fixtures, leaks, and gas lines, plus electrical work covering panels, wiring, lighting, EV circuits, and safety inspections. KJ Thomas Mechanical keeps a Boulder County Mechanical License on file and is fully insured, handles Xcel rebate paperwork and state and federal incentive stacks, and offers Wells Fargo financing for installs with approved credit.
Services
Heat pump installation
Furnace installation and repair
Air conditioning installation
Ductless mini-split systems
HVAC maintenance and tune-ups
Why choose us?
Location & hours
6175 Trevarton Dr, Longmont, CO 80503, USA
FAQs
How long has KJ Thomas Mechanical been in business?
The company has been family-owned and Boulder-based since 1995. Karl Thomas founded it and still walks jobs today, and his family remains involved in running it.
What HVAC services do you offer?
KJ Thomas Mechanical installs and services heat pumps, high-efficiency gas furnaces, air conditioning, and ductless mini-splits, and also handles seasonal maintenance tune-ups, diagnostics and repair, whole-home humidifiers, and air purification.
Are you licensed and insured?
Yes. A Boulder County Mechanical License is kept on file and the company is fully insured. Certificates are available on request.
What equipment brands do you install?
Most installs use high-efficiency Trane equipment, and Mitsubishi mini-splits are paired in when zoned comfort or a retrofit makes sense.
Do you help with rebates?
Yes. The team handles Xcel rebate paperwork and guides homeowners through state and federal incentive stacks, then closes the loop after the install.
Is financing available?
Wells Fargo financing is available for installs with approved credit through Wells Fargo Bank, N.A., and 0% interest promotions are often available for qualifying Trane equipment.
Do you offer emergency service?
Priority no-heat and no-cooling support is offered for KJT-installed systems, warranty issues, and severe weather conditions.
Do you work on commercial properties?
Yes. Alongside homes, townhomes, rentals, and additions, the team serves light commercial spaces including studios, tenant finishes, boutique retail, small offices, restaurants, and light warehouses, with light commercial replacements including rooftop units and ducted zoning.