Key Heating & Air Conditioning

New England winters demand reliable heating. At Key Heating & Air Conditioning, we specialize in keeping your family warm and safe even during the harshest cold snaps. Our NATE-certified technicians are experts in furnaces, boilers, heat pumps, and radiant heating systems.

We understand that a broken heater is an emergency. That is why we offer fast, 24-hour response times for heating repairs in NH Seacoast. Our process starts with a thorough diagnostic evaluation to identify the root cause. We explain all options and provide upfront pricing so you can make an informed decision. For installations, we help you choose the most energy-efficient system for your home and budget, including high-efficiency gas furnaces, oil boilers, and electric heat pumps.

Routine maintenance is key to avoiding costly breakdowns. Our heating tune-up service includes cleaning components, checking safety controls, measuring carbon monoxide levels, and optimizing performance. With our membership plan, you receive priority scheduling and year-round savings. Whether you need a quick repair or a complete system replacement, trust Key to deliver quality workmanship and lasting comfort. We work with all major brands and back every job with a guarantee. Call us today to schedule your heating service in NH Seacoast.

Keep your cool with Key Heating & Air Conditioning. For over 30 years, we have installed, repaired, and maintained central air conditioning systems and ductless mini-splits across NH Seacoast. From a quick AC tune-up to a full system replacement, our licensed technicians provide efficient, honest service.

We know how uncomfortable a broken air conditioner can be during a summer heatwave. That's why we prioritize cooling emergencies and aim to have your system back up and running the same day. Our repair process includes a complete system analysis, refrigerant leak detection if needed, and a clear breakdown of costs before any work begins. For new installations, we help you select the right size and SEER rating for maximum efficiency and lower utility bills. Ductless mini-splits are a popular choice for room additions, older homes without ductwork, or sunrooms — we are experts in multi-zone and single-zone systems.

Preventative maintenance extends the life of your AC and prevents expensive surprises. Our cooling maintenance plan includes cleaning coils, checking refrigerant levels, inspecting electrical components, and verifying thermostat calibration. Members enjoy two tune-ups per year plus discounts on repairs. We also offer financing options to make new installations affordable. No matter your cooling need, from repair to replacement, you can count on Key for professional, courteous service. Contact us today to book your cooling appointment in NH Seacoast.

Your home's comfort goes beyond temperature — it's about the air you breathe every day. Key Heating & Air Conditioning provides comprehensive indoor air quality (IAQ) solutions for NH Seacoast homeowners. From humidity control to air purification, we help create a healthier living environment for your family.

Poor indoor air can trigger allergies, asthma, and other respiratory issues. Our IAQ services include whole-house humidifiers and dehumidifiers to maintain ideal moisture levels, electronic air cleaners and HEPA filtration systems to capture dust and pollen, UV germicidal lights to neutralize mold and bacteria, and energy recovery ventilators to bring in fresh outdoor air without losing heating or cooling. We also install Wi-Fi thermostats that let you control your home's temperature and air quality from your smartphone, saving energy and enhancing convenience.

Looking for more home solutions? We specialize in geothermal heating and cooling, which uses the earth's constant temperature to slash energy bills by up to 70%. We also install home generators to keep your lights on during power outages, and radiant heating systems with snowmelt capabilities for driveways and walkways. Every solution we offer is backed by our commitment to environmental innovation and customer-first service. Schedule a free consultation to test your indoor air quality and explore the best options for your home. Breathe easier with Key.