10 Best HVAC Companies in Boulder, CO

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Last Updated: February 25, 2025

According to the Department of Energy, about 55% of the energy used in American homes is used for heating and cooling. This may not surprise you if you live in Boulder and spend all winter running your heat. The average resident spends $180 a month on their heating.

Explore our list of the top HVAC companies in Boulder to find the best one for you and your home. Our topic contractors can help you reduce your bills while still staying comfortable.

Top 10 Best HVAC Companies in Boulder

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KJ Thomas Mechanical

KJ Thomas Mechanical Logo

Our Rating

User Rating

6175 Trevarton Dr, Longmont, CO 80503 (303) 435-8141 kjthomasmechanical.com

Free quotes

Reliable customer support

Clear pricing policy

Informative resources

Prompt service delivery

Services Offered

Ductless
Smart home integration
Ac installation
Inspection
Indoor air quality
Filtration
Furnace installation
Maintenance
Boiler installation
Furnace repair
Radiant heating
Boiler repair
Duct cleaning
Ventilation

Sanders and Johnson Heating and Cooling

Sanders and Johnson Heating and Cooling Logo

Our Rating

User Rating

7100 Broadway #7K, Denver, CO 80221 (720) 594-2176 sandersandjohnson.com

Free quotes

Prompt service delivery

Informative resources

Clear pricing policy

Reliable customer support

Services Offered

Ac repair
Boiler installation
Furnace installation
Inspection
Ac installation
Maintenance
Boiler repair
Filtration
Emergency services
Ductless
Indoor air quality
Furnace repair

Controlling Systems

Controlling Systems Logo

Our Rating

User Rating

7000 N Broadway #1-106, Denver, CO 80221 (720) 445-8906 controllingsystemsco.com

Informative resources

Prompt service delivery

Free quotes

Clear pricing policy

Services Offered

Filtration
Ac repair
Furnace repair
Boiler repair
Smart home integration
Ventilation
Maintenance
Ductless
Ac installation
Radiant heating
Boiler installation
Emergency services
Indoor air quality
Furnace installation

MileHi HVAC Contractor Denver

MileHi HVAC Contractor Denver Logo

Our Rating

User Rating

4885 S Broadway, Englewood, CO 80113 (720) 770-0055 milehihvac.com

Free quotes

Informative resources

Reliable customer support

Clear pricing policy

Services Offered

Ductless
Furnace installation
Ventilation
Indoor air quality
Furnace repair
Maintenance
Duct cleaning
Inspection
Ac installation
Boiler installation
Filtration
Emergency services
Ac repair

Now Heating and Air

Now Heating and Air Logo

Our Rating

User Rating

8661 Rosemary St, Commerce City, CO 80022 (303) 287-8000 nowha.com

Informative resources

Reliable customer support

Prompt service delivery

Free quotes

Clear pricing policy

Services Offered

Duct cleaning
Ductless
Ac installation
Inspection
Emergency services
Indoor air quality
Maintenance
Furnace installation
Boiler installation
Boiler repair
Ac repair
Furnace repair

Elkhorn Heating & Air Conditioning, Inc./Elkhorn Electric, Inc.

Elkhorn Heating & Air Conditioning, Inc./Elkhorn Electric, Inc. Logo

Our Rating

User Rating

3869 Norwood Dr #9, Littleton, CO 80125 (720) 615-0098 myelkhorn.com

Informative resources

Reliable customer support

Prompt service delivery

Free quotes

Clear pricing policy

Services Offered

Filtration
Ductless
Inspection
Furnace repair
Smart home integration
Ac repair
Furnace installation
Maintenance
Emergency services
Ac installation
Indoor air quality
Boiler installation

Fort Collins Heating & Air Conditioning

Fort Collins Heating & Air Conditioning Logo

Our Rating

User Rating

208 Commerce Dr #4, Fort Collins, CO 80524 (970) 279-3750 fortcollinsheating.com

Clear pricing policy

Reliable customer support

Informative resources

Services Offered

Boiler installation
Furnace repair
Furnace installation
Radiant heating
Ac installation
Indoor air quality
Boiler repair
Ventilation
Emergency services
Ac repair
Ductless
Duct cleaning
Filtration
Maintenance

D.N.I. Heating-Cooling-Refrigeration-Plumbing

D.N.I. Heating-Cooling-Refrigeration-Plumbing Logo

Our Rating

User Rating

14196 Co Rd 7, Mead, CO 80542 (720) 868-5291 dniheating.com

Informative resources

Reliable customer support

Free quotes

Clear pricing policy

Services Offered

Ductless
Furnace repair
Furnace installation
Maintenance
Radiant heating
Ac repair
Filtration
Boiler installation
Ac installation
Indoor air quality
Inspection
Emergency services
Smart home integration

Steel T

Steel T Logo

Our Rating

User Rating

2750 S Shoshone St, Englewood, CO 80110 (303) 761-9276 steelt.com

Prompt service delivery

Informative resources

Clear pricing policy

Reliable customer support

Free quotes

Services Offered

Emergency services
Indoor air quality
Inspection
Furnace installation
Ventilation
Filtration
Ac installation
Maintenance
Ductless
Ac repair
Furnace repair

WireNut Home Services

WireNut Home Services Logo

Our Rating

User Rating

4901 E Dry Creek Rd Suite 290, Centennial, CO 80122 (303) 731-1966 thewirenut.com

Free quotes

Informative resources

Reliable customer support

Clear pricing policy

Services Offered

Inspection
Ac repair
Emergency services
Furnace installation
Maintenance
Boiler installation
Filtration
Ac installation
Boiler repair
Duct cleaning
Furnace repair
Ductless
Today's Homeowner Ranking Methodology

Today's Homeowner looks at dozens of datapoints on hvac companies to come up with our data-driven rankings. It's not possible for a company to pay for preferential treatment in our rankings. We look at the following key factors in determining who should top our list:

  • Company Experience
  • Real User Reviews
  • Company Reputation
  • Accreditations and Licenses
  • Service Area
  • Customer Service
Have questions about our methodology or company ratings? Reach out to FindAPro@TodaysHomeowner.com.

Signs You May Need HVAC Repair or Replacement

If your home's HVAC system isn't working correctly or suffering from a lot of wear and tear, you might need an HVAC contractor for maintenance or replacement. Look for these common indicators that your system needs professional attention:

  • Frequent breakdowns and need for repairs
  • Refrigerant leaks
  • Uneven heating/cooling or poor air circulation
  • Higher than normal energy bills
  • Rust, cracking, or corrosion
  • Thermostat malfunctions or temperature control issues
  • Strange noises when turning on
  • An HVAC system that's over 15 years old

If you notice any of the above, have a local HVAC technician inspect your system. They can diagnose problems and let you know whether repair or full HVAC replacement is the better solution.

Cost of HVAC Installation and Maintenance in Boulder

What you spend on HVAC installation or maintenance is determined by your system type. Common HVAC unit styles include the following:

  • Split or mini-split: Homes without ductwork for central heating and cooling often have split or mini-split HVAC systems. These systems consist of indoor units in each room to regulate temperature, which all connect to an outdoor unit.
  • Hybrid split: A hybrid split HVAC unit operates similarly to a regular split system. It gives flexibility by having the option to use either electricity or gas for energy.
  • Heat pump: Heat pumps work by moving warm and cool air between your home and the outdoors. These systems don't produce heat or air conditioning themselves, and are more suited to more moderate climates. They may not be as effective during Boulder's cold winters.
  • Packaged heating and air: Packaged HVAC systems work well in smaller houses. They consist of a single combined air conditioner and heating unit, typically located in a basement or attic. This unit is typically space-saving, cost-effective, and easy to maintain.

The cost of HVAC maintenance also varies depending on the kind of work you're having done. HVAC systems are complex and might require different kinds of maintenance. The cost of some common repairs is as follows:

HVAC Unit TypeCost
Split$2,008-$5,120
Hybrid Split$4,069-$7,497
Heat Pump$3,151-$32,106
Packaged Heating and Air$264-$439

Ways to Save Money on HVAC Costs

It’s important to complete repairs or full-system HVAC replacements as needed, though they can be expensive. The good news is that homeowners have ways to minimize progressive deterioration and reduce the frequency of breakdowns.

  • Change filters regularly. Cleaning or replacing your air filters every 1–3 months helps air flow smoothly through your system. Also try to keep debris away from the outside areas of your HVAC system as much as possible.
  • Monitor for potential problems. Keeping a close eye on the efficiency of your HVAC system — for instance by checking your thermostat settings and energy bills — helps you identify and fix problems before they get out of hand.
  • Change the position of your blinds seasonally. Closing your blinds in the summer blocks some passive solar heat from getting indoors. Opening the blinds in the winter allows this same heat to help warm your home. Both of these measures help decrease the work required from your home’s HVAC system.
  • Keep your system clean. Keeping your grills, ductwork, indoor evaporator coil, and condenser fan blades clean enables your HVAC system to function effectively and lowers the risk of mold. The National Air Duct Cleaners Association recommends cleaning your HVAC when you notice it starting to get dirty.
ServiceCost
Filter Replacement$66-$176
Condensor Cleaning$1,318-$3,955
Thermostat Repair$88-$220
Ductwork Cleaning$422-$1,055

How To Choose a Local HVAC Company

Knowing what to look for in an HVAC company is crucial for a successful project. Partnering with an experienced, licensed contractor can offer you peace of mind and make sure your system provides reliable air conditioning and heating for your home.

Compare Multiple Bids

Contact at least three HVAC companies for quotes. Describe the issues and have technicians visit to inspect your system if possible. Compare the providers' explanations, solutions, estimated costs, warranties, and timeframes. Avoid companies that pressure you or demand payment upfront.

Check Credentials

When looking for an HVAC company, choose one with technicians that have the right training, licenses, and experience. In all states, HVAC contractors need to obtain a Section 608 Technician Certification from the Environmental Protection Agency (EPA). This certification is mandatory for any individual who helps "maintain, service, repair or dispose of equipment that could release refrigerants into the atmosphere." Contractors must pass an exam (the type of exam depends on the type of equipment they intend to work with) to be certified by the EPA. All other licensing requirements are handled by the state.

The state of Colorado doesn't have state-level HVAC contractor licensing requirements; however, anyone who operates an HVAC business is required to have a Colorado business license, plus insurance. It's a good idea to check with your municipal government to find out if there are any local licensing requirements for HVAC contractors. Additionally, contractors that do electrical or plumbing work in addition to HVAC work must register with the State Plumbing Board or the Colorado Electrical Board, respectively. You should also look at reviews and complaints on sites like the Better Business Bureau (BBB), Yelp, and Google Reviews. Pick a company with glowing reviews and reports of great customer experiences.

Understand Work Details

Always make sure you know what a company’s process is like. When getting HVAC repairs, ask your provider to explain which parts need replacement and explain why. Confirm that your technician will clean and test your system after finishing the work to verify proper operation. When replacing your HVAC system, ask the installation company to provide details on the new features, estimated installation time, energy efficiency, model, and brand. Before signing a contract, make sure you understand how your provider will properly size the new unit for your home and what the cost will be.

Compare Warranties

Reliable HVAC companies provide warranties for their services. The broader the coverage, the better, so make sure to review warranties between providers. Choose the one that gives you the most coverage at a reasonable cost.

Get Quote in Writing

Always get quotes for HVAC service in writing before work begins. A comprehensive quote should cover both materials and labor. Make sure you review all terms before signing a contract.

Frequently Asked Questions About HVAC in Boulder, CO

Typically, your HVAC system should be inspected twice a year. After that inspection, your technician will tell you what, if any, services are needed. You should also call a technician if you start to notice any issues, like leaks, unusual smells, or strange noises. If your home has ductwork, it should be serviced every few years.

The best times of the year to have your HVAC system inspected are the spring and fall. Technicians tend to be less busy during these times, so it will be easier to get an appointment. This also ensures that your system is ready for the summer and winter, which is when it normally sees the most use.

You can save energy throughout the year by reducing the amount of work it takes for your HVAC system to maintain your home's temperature. Always keep your thermostat as close to the outside temperature as possible, and try to adjust it only a few degrees at a time. You might also consider getting a smart thermostat.

Generally, HVAC installation or replacement takes between one and three days for the entire system. Installing or replacing an air conditioning unit or a furnace takes anywhere from about half a day up to two days. The exact amount of time will depend on factors like the size of your house, how easily accessible different areas are, and whether your technician finds any problems.

For a 2,000-square-foot home, you should look for a furnace that's between 50,000 and 80,000 BTUs (British thermal units). In Boulder, you'll likely look for a furnace on the higher end of or above this range.

For a 2,000-square-foot home, you'll also want to look for an air conditioning unit with between 2.5 and 5 tons of capacity. In general, if your home is larger than 1,000 square feet, central air will be more effective than window air conditioning units.

Your HVAC company may have financing options via a third-party lender, or you might be able to obtain a loan on your own. It's a good idea to discuss payment options with your HVAC company and a financial advisor to make sure that you find the best option for you.

There are a number of ways you can make your HVAC system more energy-efficient:

  • Make sure your air ducts remain clean, and change or clean your air filters on a regular basis.
  • Schedule regular inspections to take care of problems as they arise.
  • Keep your attic well-ventilated and make sure all doors and windows are well-sealed.
  • Install a smart thermostat. If you don't want to or can't buy one, try to keep your inside temperature as close to the outside temperature as you can.
  • When it comes time to replace any part of your HVAC system, explore Energy Star-certified or other environmentally friendly options.

Other Boulder, CO Home Services

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