10 Best HVAC Companies in Denver, CO

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Last Updated: February 25, 2025

According to the Department of Energy, approximately 55% of the energy used in American homes is used for heating and cooling. You want to be comfortable in your Denver home, but you also don't want to be wasting your money on ineffective cooling and heating.

The right HVAC contractor can get your system into shape for a reasonable price, saving you money while keeping your home comfortable. That's why we've put together this guide to the top HVAC companies in Denver.

Top 10 Best HVAC Companies in Denver

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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

Clear pricing policy

Informative resources

Prompt service delivery

Reliable customer support

Free quotes

Services Offered

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

Controlling Systems

Controlling Systems Logo

Our Rating

User Rating

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

Informative resources

Free quotes

Clear pricing policy

Prompt service delivery

Services Offered

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

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

Prompt service delivery

Free quotes

Informative resources

Reliable customer support

Clear pricing policy

Services Offered

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

MileHi HVAC Contractor Denver

MileHi HVAC Contractor Denver Logo

Our Rating

User Rating

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

Informative resources

Clear pricing policy

Reliable customer support

Free quotes

Services Offered

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

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

Reliable customer support

Free quotes

Informative resources

Clear pricing policy

Prompt service delivery

Services Offered

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

Reliable customer support

Free quotes

Clear pricing policy

Informative resources

Prompt service delivery

Services Offered

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

Steel T

Steel T Logo

Our Rating

User Rating

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

Reliable customer support

Free quotes

Prompt service delivery

Informative resources

Clear pricing policy

Services Offered

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

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

Clear pricing policy

Free quotes

Services Offered

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

Informative resources

Clear pricing policy

Free quotes

Reliable customer support

Services Offered

Maintenance
Filtration
Emergency services
Furnace repair
Furnace installation
Ac repair
Duct cleaning
Boiler installation
Inspection
Ductless
Ac installation
Boiler repair

Grand Home Services, LLC

Grand Home Services, LLC Logo

Our Rating

User Rating

4267 S Argonne St, Aurora, CO 80013 (720) 365-1187 grandhomeservicesllc.com

Informative resources

Free quotes

Clear pricing policy

Prompt service delivery

Services Offered

Ac installation
Inspection
Ac repair
Furnace repair
Zoning systems
Ventilation
Boiler repair
Ductless
Emergency services
Furnace installation
Maintenance
Indoor air quality
Boiler installation
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 HVAC system is faulty or getting near the end of its lifespan, it likely needs servicing or replacement from an HVAC company. Look for these signs your system needs service:

  • Unusually high energy bills
  • Frequent breakdowns and need for repairs
  • Odd noises when turning on
  • Temperature control issues or thermostat malfunctions
  • Refrigerant leaks
  • Poor air circulation or uneven heating/cooling
  • Rust, corrosion, or cracking
  • An HVAC system that's over 15 years old

These HVAC red flags indicate that you should have your system evaluated. A local provider can complete an inspection, diagnose problems, and recommend repairing or replacing your HVAC unit.

Cost of HVAC Installation and Maintenance in Denver

Your HVAC installation or maintenance cost changes depending on the type of unit. Common HVAC unit varieties 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 interior units in each room to regulate temperature, which all connect to an outdoor unit.
  • Hybrid split: A hybrid split HVAC system functions much like a standard split system, but is able to utilize either gas or electricity for power.
  • Heat pump: Heat pumps work by transferring hot and cold air between your home and the outdoors. These systems don't produce heat or air conditioning themselves, and are better for more moderate climates.
  • Packaged heating and air: Packaged HVAC systems work well in smaller houses. They consist of a single combined heating and air conditioning unit, commonly located in a basement or attic. This unit is typically compact, cost-effective, and easy to maintain.

The price of HVAC maintenance also depends on what kind of work being done. HVAC systems are complex and may require different kinds of maintenance. The prices of some common jobs are as follows:

HVAC Unit TypeCost
Split$2,000-$5,099
Hybrid Split$4,053-$7,467
Heat Pump$3,138-$31,976
Packaged Heating and Air$263-$438

Ways to Save Money on HVAC Costs

Repairing or replacing your HVAC system when needed is important, but can be costly. Luckily, there are steps you can take to slow the wear and tear on your system.

  • Keep your system clean. Regularly cleaning ductwork, indoor evaporator coil, condenser fan blades, and grills helps your HVAC system run efficiently and lowers the risk of mold. The National Air Duct Cleaners Association advises cleaning your heating and cooling system when it starts to look dirty.
  • Monitor for potential problems. Keeping an eye out for problems, for instance by consistently checking your thermostat and energy bills, helps you resolve them before they get too expensive.
  • Change the position of your blinds seasonally. Leaving your blinds open during the winter allows passive solar heating to warm your home. Closing the blinds in warmer seasons helps prevent the same heat from getting inside. Doing both helps lessen the demand on your HVAC system.
  • Change filters regularly. Replacing or cleaning your air filters every 30–90 days helps air flow smoothly through your system. You should also try to keep debris away from the external sections of your HVAC system as much as possible.
ServiceCost
Filter Replacement$66-$175
Condensor Cleaning$1,313-$3,939
Thermostat Repair$88-$219
Ductwork Cleaning$420-$1,050

How To Choose a Local HVAC Company

Knowing the right things to look for in an HVAC company is key for a smooth installation or repair. Picking an established business with certified technicians gives you assurance your HVAC system will deliver consistent heating and cooling year-round.

Compare Multiple Bids

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

Check Credentials

Choose an HVAC company with skilled technicians who have appropriate licensing and experience. HVAC contractors in all states have federal requirements set by the Environmental Protection Agency (EPA). To obtain the EPA Section 608 Technician Certification, individuals must pass an exam (the specific exam depends on the kind of equipment they intend to work with). Section 608 certification is required for all technicians who "maintain, service, repair or dispose of equipment that could release refrigerants into the atmosphere." All other licensing requirements are handled at the state level.

There are no state-level licensing requirements for HVAC technicians in Colorado; however, anyone who runs 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 determine if there are local licensing requirements for HVAC contractors. Additionally, contractors that do plumbing or electrical work in addition to HVAC work must register with the State Plumbing Board or the Colorado Electrical Board, respectively. Always check a company's reviews and complaints with organizations such as the Better Business Bureau (BBB), Google Reviews, and Yelp. Choose a provider with glowing reviews and stories of positive service experiences.

Understand Work Details

Always make sure you understand the details of your project. When HVAC repairs are required, your provider should detail which parts need replacement and why. Confirm that your technician will clean and test your system after repairs are completed to ensure that it’s working properly. When replacing your HVAC system, ask the contractor to describe the new estimated installation time, brand, features, model, and energy efficiency. Before signing a contract, ask how your provider plans to accurately size the unit for your home and how much it will cost.

Compare Warranties

A trustworthy HVAC company will back its repair services and installations with a warranty. The longer and more comprehensive the warranty coverage, the better. Carefully review warranty terms for each contractor and choose the provider that offers the greatest protection within your budget.

Get Quote in Writing

Get a written quote before HVAC work starts. A full quote includes both labor and material costs. Make sure you understand and agree to all terms before signing the contract.

Frequently Asked Questions About HVAC in Denver, CO

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

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

You can save energy throughout the year by making it easier for your HVAC system to maintain your home's temperature. Always keep your thermostat as close to the outside temperature as is comfortable, and avoid making drastic changes — adjust it only a few degrees at once. You might also consider purchasing 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 things like the size of your home, how easily accessible different sections are, and whether your technician runs into any problems.

For a 2,000-square-foot home, you should look for around 2.5 to 5 tons of air conditioning capacity. For homes over 1,000 square feet, central air will usually be more effective than window units for cooling.

For a 2,000-square-foot home, you'll also look for a furnace that is between 50,000 and 80,000 BTUs (British thermal units).

Your HVAC company might provide financing options through a third-party lender, or you might choose to obtain a loan on your own. It's smart to discuss payment options with a financial advisor and your HVAC company to make sure that you're choosing 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 come up.
  • Make sure your doors and windows are well-sealed and keep your attic well-ventilated.
  • Install a smart thermostat. If you aren't able to purchase one, try keeping your inside temperature as close to the outside temperature as is comfortable.
  • When you need to replace part of your system, explore Energy Star-certified or other environmentally friendly options.

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