Call us now and we'll work to schedule a technician the same day, across every trade we handle.
Book A ServiceHVAC Company Serving Windham, NH
Heating & Cooling Services for Windham Homes & Businesses
When your heating or cooling system needs attention, Cornerstone Services is the HVAC company that Windham residents and business owners call first. We handle air conditioning repair and installation, furnace repair and installation, heater maintenance and replacement, heat pump repair and installation, boiler installation, and ductless mini split installation. Add plumbing, electrical, cleaning, and handyman services to that list and you’ve got one company that takes care of everything with a single call. More than 1,250 five-star reviews across Google, HomeAdvisor, Facebook, and Yelp reflect the reputation we’ve built doing exactly that.
Our team is on-call around the clock for scheduling, questions, or urgent system failures.
Need HVAC service in Windham today? Call Cornerstone Services at (603) 874-1402 and we’ll work to get a technician to you the same day.
Air Conditioning Repair & Installation in Windham, NH
When warm air starts coming through the vents, airflow drops off, or your system short-cycles and drives up your energy bills, it’s time to call. Our HVAC services cover the full range of air conditioning work: system diagnostics and repair, new unit installation, seasonal tune-ups, and ductless mini split installation for homes without existing ductwork or for room additions that need independent climate control.
Same-day scheduling is available when you need help fast. Our service vehicles are staged on-call from multiple locations so we can reach Windham homeowners without a long wait. Every job we complete is backed by a signed workmanship warranty under our quality assurance policy, so you have documented protection on the work we do.
Furnace, Boiler & Heater Services for New Hampshire Winters
Windham winters are hard on heating systems. Consistent cold and heavy snow put sustained demand on furnaces and boilers from November through March, and a system that’s been limping along is a breakdown waiting to happen. Our heating services cover furnace repair and installation, heater maintenance and replacement, and boiler installation for homes that rely on hydronic heat.
Preventive maintenance is one of the most cost-effective heating decisions most homeowners can make. Many systems have a functional lifespan of 15 to 20 years, and regular service keeps them running efficiently through that window. When a system is aging and repairs are adding up, we can give you a straightforward assessment of whether repair or replacement is the better call. Our per-job flat pricing applies to all heating work. The number we quote you is the number you pay at completion, with no hourly overruns and no hidden fees. Every technician we send to your home has passed a background check before arriving.
Heat Pump Repair & Installation for Year-Round Comfort
Heat pumps are a practical choice in southern New Hampshire because a single system handles both heating and cooling. That versatility makes installation decisions simpler and maintenance more straightforward over time. In a climate with distinct seasons like Windham’s, proper system sizing matters: an undersized unit can lose efficiency as outdoor temperatures drop, so getting the installation right from the start affects how the system performs through winter.
Cornerstone Services handles heat pump repair and installation for residential and commercial clients. Whether you’re replacing a failed unit or installing a heat pump for the first time, our team is available for urgent repair needs and routine service alike.
Why Windham Homeowners Choose Cornerstone Services
Our track record in Windham reflects more than just technical work.
Here’s what our clients consistently point to:
- 1,250+ Five-Star Reviews: Earned across Google, HomeAdvisor, Facebook, and Yelp, one job at a time.
- On-Time Arrival: Service vehicles staged at multiple locations with a scheduling system built around showing up when we say we can.
- Flat Per-Job Pricing: We price by the job, not the hour. The quoted price is the final price at completion.
- Signed Workmanship Warranty: Every job is backed by a written warranty under our quality assurance policy.
- Background-Checked Workers: Every technician who enters your home has cleared a background check.
- Same-Day Scheduling: Available for customers who need help quickly.
- Financing Available: Ask about current terms when you schedule.
- Monthly Promotions: Rotating special offers on scheduled services throughout the year.
- 24/7 On-Call Staff: Available for scheduling, questions, or urgent needs around the clock.
- Clean Job Sites: Technicians clean up after every job and leave your property the way they found it.
One Call for HVAC, Plumbing, Electrical & More
Most homeowners juggle multiple contractors when a home improvement project crosses trade lines. A heating job that reveals a plumbing issue means a second call, a second scheduling window, and a second set of terms. Cornerstone Services was built to eliminate that problem. Our plumbing services, electrical services, HVAC work, cleaning, and handyman services all run under one roof, one pricing structure, and one signed workmanship warranty.
We also offer a dedicated home modifications service line that covers wheelchair ramp installation, grab bar installation, stairlift installation, kitchen modifications for elderly residents, and smart home setup for elderly and disabled clients. That’s a scope of service most HVAC-only providers simply can’t offer.
Schedule Your Windham HVAC Service Today
Whether you’re dealing with a system failure that needs attention today or want to get ahead of the next season with preventive maintenance, Cornerstone Services is ready. Same-day scheduling is available, and our on-call staff is reachable for scheduling, questions, or urgent needs.
Call us at (603) 874-1402 or visit Cornerstone Services to schedule your service.
The Cornerstone Difference: Built on Trust. Backed by Service.
The service standards behind the thousands of positive experiences our customers share year after year.
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Flat-Rate Pricing
The price you're quoted before the job begins is the price you pay at completion, no hourly adjustments, no surprise charges.
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On-Time Arrival
Service vehicles are staged at multiple locations so we show up when we say we will, not hours after your window closes.
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Signed Workmanship Warranty
Every job comes with a signed warranty under our quality assurance policy. You get a written record of what the work covers.
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Background-Checked Workers
Every technician passes a background check before they step onto your property, regardless of the trade or type of job.
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Same-Day Scheduling
Call us and we'll work to get a technician out the same day. Our on-call staff is available 24 hours a day, every day of the week.
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Clean Job Sites
Your home or business will be left clean when we're done. Technicians are responsible for cleaning up after every job, no exceptions.
1,250+ Five-Star Reviews & Counting
We let our work speak for itself. From quick repairs to major installs, our customers say it best.
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Paul Quinn did electrical work for me and he was the best!Nicola Sullivan
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Michael with Cornerstone Services was excellent to work with.Jamie Fasbender
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He was very professional and explained all that he was doing.Mary Duford
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Showed up as agreed and was very informative.John Cote
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Fast response and very professional.Anne Butterworth
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On time. Thorough. Kind. Positive attitude in this awful heat.N N
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Cornerstone came promptly and fixed them.Marilyn Frank
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He and his partner PJ worked quickly and efficiently to solve a dryer vent issue we had been experiencing.Pierre Thelusma
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Took care of our electrical needs with ease!Peter Larocque
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He was quick, thorough, professional, and made sure everything was done right.Jess Nichol
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10/10 experience and so happy we got in touch with him and this company!Anthony Capozzi
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They were so neat, you would never know there was a problem.Bill Mullen
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Paul is always friendly, polite, and professional.Cindy Marcin
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Paul was efficient and expert at correcting the problem and ensuring all was well.Woodrow Cook
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He went above and beyond for me when some unforeseen issues arose with my bathtub install.Susan Hevey
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Tech was on time, friendly, and competent.Vincent JJ Balukonis
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He was very thorough and quickly corrected the issue.Gary Chisholm
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Josh was very prompt with his services and explained things clearly.Kim Mcanany
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Arnold is a pleasure to work with.Esther Bradbury
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Jason is always great and knowledgeable and friendly.Mark Duell