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Best HVAC / Furnace
Repair & AC Repair in

Why These HVAC Professionals?

Our goal is to connect people with the best local experts. We scored Boulder HVAC Professionals on more than 25 variables across five categories, and analyzed the results to give you a hand-picked list of the best.

Reviewed Curated Top Picks 28 19 7

Our Selection Criteria:

  • 1. Reputation

    A history of delighted customers and outstanding service.

  • 2. Credibility

    Building customer confidence with licensing, accreditations, and awards.

  • 3. Experience

    Masters of their craft, based on years of practical experience and education.

  • 4. Availability

    Consistently approachable and responsive, so customers never feel ignored.

  • 5. Professionalism

    Providing service with honesty, reliability, and respect.

Efficient Comfort

Efficient Comfort is a Broomfield HVAC group backed by 10 years of experience in the field. The team features installs, service, and repairs of air conditioning units, heating systems and furnaces, indoor air quality products, and water heaters, 24-hour emergency service, and skilled technicians certified by the North American Technician Excellence on every job. Clients appreciate the group's honest communication, professional and thorough work, reasonable rates, and top-quality equipment used in all services for dependable, efficient HVAC systems through every season. Efficient Comfort is a Bryant Factory Authorized Dealer, has achieved an A+ rating as an Accredited Business with the Better Business Bureau, and also offers discounts to senior citizens. Financing options are available through FTL Finance as well.

Broomfield, CO 80021


KJ Thomas Mechanical

KJ Thomas Mechanical has been installing and repairing heating and cooling systems in Longmont for over 20 years. Services cover air conditioners, furnaces, heat pumps using both air and water source, hybrid boiler systems, rooftop units, ductless systems, zoning systems, custom ductwork, and programmable thermostats. Indoor air quality solutions include whole-house humidifiers, high-efficiency filters for the whole home, whole-house air purifiers, and UV lamps, and crews can also work on HVAC needs for remodeling projects and basement finishes. Potential clients can review the company's licenses, including a State of Colorado Master Mechanical License, on its site, and KJ Thomas Mechanical is an Authorized Trane Dealer, is a Trane Comfort Specialist, and also donates HVAC services to Habitat for Humanity.

Longmont, CO 80503


Marmot Heating, Cooling & Plumbing

Marmot Heating, Cooling & Plumbing is a heating and cooling company in Boulder. The group employs trained, certified, and experienced technicians who can handle HVAC repairs and installs, inspections, regular maintenance, radiant floor hydronic heating, hot water heaters and boilers, wall mount heaters and furnaces, air conditioners, swamp coolers, and exhaust fans. The company also offers a range of plumbing services with a Master plumber for everything from drain cleaning and sump pumps to gas line pipe repairs and sewer line camera inspections. Clients can request a free estimate, and crews always offer detailed evaluations, various options, full explanations, and upfront pricing to be approved before any project begins. Marmot also features 24/7 emergency services and has a reputation for prompt service, top-quality results, flexible scheduling, and reasonable prices.

Precision Plumbing & Heating, Inc.

Precision Plumbing & Heating, Inc. has been installing and repairing HVAC systems in Boulder for almost 30 years. Services include fast heating and air conditioner repairs, energy-saving heating and cooling solutions, and new installs, and clients benefit from clean, friendly technicians, upfront pricing, and 24/7 support. Indoor air quality solutions are also available including whole-house humidifiers and UV systems, and crews can handle full residential plumbing and electrical work as well. Precision Plumbing & Heating is fully licensed and insured, holds an A+ rating with the Better Business Bureau, boasts tens of thousands of past customers, and has won First Place in service from the Daily Camera 15 times. The company also supports local charities, and interested parties can ask about financing options as well.

Sherrelwood Services, Inc.

Sherrelwood Services, Inc. is a Boulder HVAC group. The team brings over 20 years of experience with gas and electric heating solutions, heat pump service, air conditioning installs, and indoor air quality products for optimal comfort all year long. Crews can offer expert sizing and advice for new system installs, repairs and tune-ups, water heaters, high-efficiency hybrid systems, and ductless mini-split systems, and additional services include general home maintenance via its "Handy Man" offering. Available plumbing services include toilet repairs, repiping, drain cleaning, leak detection, garbage disposals, and kitchen and bathroom fixtures as well. Sherrelwood Services is certified by the North American Technician Excellence, works with top-name brands such as Rheem and Goodman, and holds an A+ rating with the BBB.

Boulder, CO 80301


Stout Mechanical Inc.

Stout Mechanical Inc. has been offering heating, ventilation, and air conditioning services in Boulder since 1993. The team specializes in the design, install, and maintenance of high-efficiency Viessmann boilers and Bosch heat pumps, hydronic systems, in-floor radiant heating and cooling, energy-saving geothermal systems, and solar thermal solutions as well as interface systems for heating, cooling, hot water production, and other needs. Additional services cover panel-style radiators, biomass gasification wood and pellet boilers, Manual J heat load calculations, towel warmers, and spa and pool heating, and crews work on new constructions as well as retrofits of existing structures. The company is able to service remote mountain properties, is licensed and insured, and has been recognized by companies such as Viessmann, Caleffi, and Viega for its workmanship.

Boulder, CO 80301


Timberline Mechanical Systems LLC

Timberline Mechanical Systems LLC brings over 200 years of combined HVAC experience to the Boulder area. The group has a reputation for helping clients install high-efficiency heating, ventilation, and air conditioning systems for lower monthly utility bills, and technicians offer repairs and preventative maintenance as well for A/C units, furnaces, evaporative coolers, boilers, heat pumps, and commercial equipment as well. Customers include private homeowners, property managers, facility managers, building owners, and general contractors, and industrial HVAC solutions along with special project services are also available. Interested parties can also ask about available tax credits and rebates for sustainable, energy-saving HVAC equipment. Timberline Mechanical Systems LLC has achieved an A+ rating as an Accredited Business with the Better Business Bureau, and all crews are highly trained and certified.

Boulder, CO 80301


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