Keeping Your Home Cozy, Season After Season.
Top-Rated Heating & Air Conditioning in Boulder, CO and surrounding areas
Heating
Our Heating products are designed to provide efficient and reliable heating and cooling solutions for your home or business.
Cooling
From ductless mini-splits to central AC units, our air conditioning products provide reliable cooling and improved indoor comfort
Current Offers
Elevate comfort with HVAC promotions! Our heating solutions ensure efficient, reliable climate control for your home or business.
About Us
Providing Comfort every hour, in every season
Whether you need fast, reliable service or you’re planning to upgrade your home with new heating or cooling equipment, KJ Thomas Mechanical is here to help. We’ve built a strong reputation in the community—ask around and you’ll hear the same thing: we go above and beyond to earn your trust, so we’re the first call you make today—and every time after.
Why Choose Us?


FINANCING OPTIONS
FLEXIBLE LENDING OPTIONS FOR YOUR NEW SYSTEM
At KJ Thomas Mechanical, we believe everyone deserves a comfortable home. That’s why we’ve teamed up with Wells Fargo to provide flexible financing options for your HVAC needs. With convenient payment plans and trusted support, you can invest in reliable heating and cooling solutions that fit your budget. Discover how easy it is to bring home comfort within reach. Financing Subject to Approval.
Apply For FinancingNext-Level Comfort Starts Here.
Our website is packed with helpful resources to help you better understand your HVAC systems and learn how to keep them running efficiently. Struggling with temperature inconsistencies, humidity issues, or allergy concerns? You don’t have to settle for discomfort—our experts can help you solve those problems and create a healthier, more comfortable indoor environment.
Testimonials
SEE WHAT YOUR NEIGHBORS ARE SAYING ABOUT KJ Thomas Mechanical










Our Blog
HELPFUL TIPS FROM OUR TEAM OF EXPERTS
Top 5 Tips for Homeowners to Maintain Their Furnace in Winter
Ensure your furnace runs smoothly all winter with these top 5 maintenance tips for homeowners. Stay warm and cozy by taking care of your furnace
Top Ways to Improve HVAC Efficiency in Your Home
Discover the top strategies to enhance your home’s HVAC efficiency in our latest blog post. Learn practical tips to lower energy bills and create a more comfortable living
The Importance of Regular Furnace Maintenance for Homeowners
Ensure optimal furnace performance and longevity by understanding the importance of regular maintenance for homeowners. Discover cost-saving benefits and increased efficiency in this insightful blog