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Energy Solutions

Your choice for residential heating and cooling _ oil, propane, natural gas and alternative energies.

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Our professionals repair and tune-up all major brands. Ask about our flat-rate pricing.

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Call on our experienced technicians to bring you the latest technology and the major brands.

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Key Heating & Air Conditioning, Inc.

“Unlocking the Earth’s Green Energy”


You want the most efficient heating and air conditioning systems for your home. That’s something our award-winning, family-owned company has been delivering to satisfied New England customers for more than 20 years.

At Key Heating & Air Conditioning, our professional technicians provide you with the name brands you want and the customer service you expect _ all at competitive prices.

We Carry All the Brands

Mitsubishi, Bryant, Bosch, Climate Master, Honeywell, Boderus, yes we carry those lines, and so many more. Our mission is to be your “go-to” for all of your home energy needs _ from free home energy assessments to comprehensive maintenance and the installation of all types of heating, air conditioning, air quality and ventilation systems and the latest in Wi-Fi thermostats.

Call On Us When You Build

Building a new home? We will provide you with a complete cost analysis of your options, for both ducted systems and ductless systems, including oil, propane, natural gas and alternative energy solutions like geothermal and solar thermal.

Alternative Energy Is A Specialty

Key is New England’s largest residential geothermal heating and cooling company. We also are a Mitsubishi Diamond Contractor installing Mitsubishi’s cooling and heating solutions, which provide energy efficiency through advanced technologies for controlling the temperature and comfort in each room of your home. By choosing Key Heating & Air Conditioning as your installation company you will receive a two-year Key Parts & Labor Warranty in addition to any manufactures warranty. Each new installation also comes with a Complimentary Annual Maintenance on the anniversary of equipment’s installation to set you up for good service history. That’s a 12 year warranty on Mitsubishi!

Talk About Efficiency

Want your current home to be more efficient? We offer a whole home performance evaluation, providing you with a full profile and recommendations to reduce your home’s energy costs and carbon footprint. Key technicians will complete a building analysis that determines heat loss/heat gain to determine the optimal heating and cooling solutions for your specific needs.

At Your Service

Key services all brands and is your one-stop shop in New Hampshire, Massachusetts and Maine for residential heating and cooling, HVAC (heating, ventilating and air conditioning), preventative maintenance, indoor air quality, generators, Wi-Fi thermostats and all of your electrical needs.

Contact Us Today

Call 603-436-8811 or 844-KEY-HVAC to schedule an appointment today. Or visit our new centrally-located showroom at 8E Continental Drive in Exeter, NH, to see Mitsubishi products on display.

A Recognized Leader

  • 2014 Business of the Year nominee, Exeter Area Chamber of Commerce
  • A+ rating from Better Business Bureau
  • Diamond Dealer status from Mitsubishi, extending your manufacturer’s warranty to seven years
  • Platinum Dealer status from Climate Master

Key Heating & Air is a member of the Air Conditioning 
Contractors of America.

We are also a member of the The Exeter Area Chamber.


We Service
All Brands:

Screened HomeAdvisor Pro - Key Heating & Air Conditioning, Inc.