10 Best HVAC Companies in Darien, CT

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Last Updated: February 25, 2025

According to the U.S. Department of Energy, about 55% of energy use in American homes goes toward heating and cooling. In Darien, you're probably looking to reduce your energy expenses and save money on your bills.

Explore our list of the top HVAC companies in Darien 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 Darien

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M&R Mechanical Services

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1050 Bridgeport Ave F3, Milford, CT 06460 (203) 951-5207 mandrmechanical.com

Free quotes

Reliable customer support

Informative resources

Clear pricing policy

Services Offered

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

BELUGA HEATING-AIR-ELECTRICAL

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577 N Main St Suite 301, Brewster, NY 10509 (845) 403-0985 belugahvac.com

Clear pricing policy

Reliable customer support

Informative resources

Free quotes

Services Offered

Furnace installation
Boiler installation
Ductless
Boiler repair
Ac repair
Inspection
Indoor air quality
Maintenance
Furnace repair
Ac installation
Emergency services
Ventilation
Radiant heating

Aire Serv of Shelton

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41 Clifton Ave, Ansonia, CT 06401 (203) 717-9527 aireserv.com

Free quotes

Informative resources

Reliable customer support

Prompt service delivery

Clear pricing policy

Services Offered

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

123 HVAC

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1992 Commerce St Suite 223, Yorktown Heights, NY 10598 (914) 245-6600 123hvac.co

Free quotes

Clear pricing policy

Prompt service delivery

Reliable customer support

Informative resources

Services Offered

Ductless
Ac repair
Ac installation
Boiler installation
Furnace repair
Emergency services
Furnace installation
Maintenance
Ventilation
Radiant heating

Thermodynamix LLC

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2 Sherman Pl, Ossining, NY 10562 (914) 909-4108 thermodynamixllc.com

Prompt service delivery

Reliable customer support

Informative resources

Clear pricing policy

Services Offered

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

Onofreo Home Comfort Systems LLC

Onofreo Home Comfort Systems LLC Logo

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280 Quarry Rd, Milford, CT 06460 (203) 793-6811 onofreohomecomfort.com

Reliable customer support

Clear pricing policy

Free quotes

Prompt service delivery

Services Offered

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

Sears Heating and Air Conditioning

Sears Heating and Air Conditioning Logo

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35 Melville Park Rd Ste 200, Melville, NY 11747 (631) 270-5310 searshomeservices.com

Free quotes

Reliable customer support

Services Offered

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

Absolute HVAC Mechanical Systems Inc.

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Granny Rd, Farmingville, NY 11738 (631) 320-0814 absolutehvacli.com

Free quotes

Prompt service delivery

Reliable customer support

Informative resources

Clear pricing policy

Services Offered

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

Innovative Air Solutions Inc.

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11 Kimball Pl, Mt Vernon, NY 10550 (914) 855-1888 innovativeairsolutions.com

Informative resources

Free quotes

Clear pricing policy

Services Offered

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

GMG HVAC Inc.

GMG HVAC Inc. Logo

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User Rating

77 Windsor Pl Suite 11, Central Islip, NY 11722 (631) 309-2535 gmghvac.com

Informative resources

Free quotes

Reliable customer support

Clear pricing policy

Services Offered

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

An HVAC system that's not working properly or outdated likely needs professional attention for maintenance or replacement. Watch for these signs that your system needs service:

  • Uneven heating/cooling or poor air circulation
  • Refrigerant leaks
  • Cracking, corrosion, or rust
  • Thermostat malfunctions or temperature control issues
  • Odd noises when turning on
  • Unusually high energy bills
  • Frequent breakdowns and need for repairs
  • 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 Darien

The price of HVAC installation or maintenance will vary depending on the type of unit you have. Common types of HVAC units include the following:

  • Split or mini-split: If your home lacks the right ductwork for central air or heating, you likely have a split HVAC system. Split or mini-split systems consist of interior units that regulate the temperature in individual rooms. These interior units are all connected to an outdoor unit.
  • Hybrid split: A hybrid split HVAC system functions much like a standard split system, but is able to utilize either electricity or gas for power.
  • Heat pump: Heat pumps circulate hot and cool air between your home and the outdoors. They don't produce their own heat or AC, so they function best in mild climates.
  • Packaged heating and air: Packaged HVAC systems work best in smaller houses. They consist of a single combined heating and air conditioning unit, typically located in a basement or attic. This unit is typically space-saving, cost-effective, and easy to maintain.

HVAC maintenance prices vary based on the specific services required. HVAC systems can be complicated and potentially require several different services. Costs for typical jobs are as follows:

HVAC Unit TypeCost
Split$2,035-$5,189
Hybrid Split$4,124-$7,598
Heat Pump$3,193-$32,538
Packaged Heating and Air$267-$445

Ways to Save Money on HVAC Costs

Repairing or replacing your HVAC system when needed is crucial, but can be expensive. Fortunately, there are actions you can take to minimize wear and tear over time on your system.

  • Monitor for potential problems. Monitoring your system for problems — for example, by checking your thermostat and energy bills routinely — helps you get ahead of problems 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 reduce the demand on your HVAC system.
  • Keep your system clean. Regularly cleaning indoor evaporator coil, grills, condenser fan blades, and ductwork helps your HVAC system run efficiently and lowers the risk of mold. The National Air Duct Cleaners Association advises cleaning your system when it starts to look dirty.
  • Change filters regularly. Air flows through your HVAC system most effectively when you replace or clean the filters every 1–3 months. Also try not to let debris pile up on the outdoor parts of your HVAC.
ServiceCost
Filter Replacement$67-$178
Condensor Cleaning$1,336-$4,008
Thermostat Repair$89-$223
Ductwork Cleaning$428-$1,069

How To Choose a Local HVAC Company

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

Compare Multiple Bids

Request estimates from three or more HVAC providers. Describe your issues and ask if technicians can inspect your system in person. Compare each provider's diagnoses, recommended solutions, estimated cost, warranties, and timeline. Avoid companies that pressure you or demand payment before work.

Check Credentials

When selecting an HVAC provider, choose one with technicians that have the right training, licenses, and experience. HVAC contractors in all states need to obtain a Section 608 Technician Certification from the Environmental Protection Agency (EPA). This certification is mandatory for all technicians who "maintain, service, repair or dispose of equipment that could release refrigerants into the atmosphere." An individual 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 at the state level.

All individuals in Connecticut who work on HVAC systems are required to be licensed by the Connecticut State Department of Consumer Protection. A worker can be licensed as a journeyperson or a contractor. Both license types have requirements related to education and work experience. You should also check a company's reviews and complaints on sites such as the Better Business Bureau (BBB), Google Reviews, and Yelp. Pick a company with glowing feedback and good customer testimonials.

Understand Work Details

Always make sure you understand the details of a planned project. When HVAC repairs are required, your provider should list which parts require 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, ask your installation company to provide details on the new brand, features, energy efficiency, estimated installation time, and model. Before work begins, 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 work. Broader coverage is better, so make sure to compare 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 committing to a provider. An itemized quote should cover both materials and labor. Make sure you review all terms before signing a contract.

Frequently Asked Questions About HVAC in Darien, CT

You should have your HVAC system inspected approximately twice a year. Following an inspection, your technician will tell you what services are required. You should also have your system inspected if you start noticing issues such as leaks, unusual smells, or strange noises. If your home has ductwork, you should have it inspected every few years.

Usually, it's a good idea to schedule inspections in the spring and fall, as technicians tend to be less busy at these times. This also helps get your system ready for the summer and winter, when it likely 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 avoid making drastic changes — adjust it only a few degrees at once. You could also consider purchasing a smart thermostat.

Generally, whole-system HVAC installation or replacement takes one to three days. 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 vary depending on things like how large your home is, how easily accessible different sections are, and whether your technician finds any problems.

Your HVAC company might have financing options through a third-party lender, or you may 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.
  • 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 to keep the temperature indoors as close to the outside temperature as you can.
  • When replacing part of your system, see if there are Energy Star-certified or similar environmentally friendly options.

Other Darien, CT Home Services

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