Call us now and we'll work to schedule a technician the same day, across every trade we handle.
Book A ServiceHVAC Services in Londonderry NH
Heating & Cooling Services for Residential & Commercial Properties
Cornerstone Services is a residential and commercial home services company serving Londonderry and the broader southern New Hampshire area. Our HVAC services include air conditioning repair and installation, furnace repair and installation, heat pump repair and installation, mini-split installation, boiler installation, and heater maintenance. We’ve earned more than 1,250 five-star reviews across Google, HomeAdvisor, Facebook, and Yelp. One call gets you every trade under one roof, one warranty, and one straightforward price.
Air Conditioning Repair & Installation Service
New Hampshire summers bring enough heat and humidity to stress any cooling system, and a mid-season breakdown is the last thing any homeowner or business needs. Cornerstone Services handles AC repair and installation for residential and commercial properties throughout Londonderry, with same-day scheduling available for customers who can’t afford to wait. Our technicians are licensed and insured, and every worker we send to your property has passed a background check.
We price by the job, not the hour. The number we quote is what you pay at completion, with no hidden fees and no hourly overruns. Every AC job we complete is backed by a signed workmanship warranty under our quality assurance policy, and our technicians clean up the job site before they leave.
Furnace Repair & Installation Services
New Hampshire winters are long and cold, and a functioning furnace isn’t optional from late fall through early spring. Cornerstone Services handles furnace repair and installation for homes and businesses across Londonderry, working with all major brands and models. Heating emergencies don’t wait for business hours, so neither do we. Same-day service is available for furnace calls when you need help quickly.
Every furnace job comes with our per-job pricing policy: the quoted price is the final price, with no adjustments at the end of the job. A signed workmanship warranty backs every furnace repair and installation we complete.
Heater Maintenance & Replacement
Preventive maintenance is a practical way to help reduce the chance of a mid-winter breakdown. Cornerstone Services provides heater maintenance and replacement services for residential and commercial clients throughout Londonderry, including boiler installation as part of our broader heating scope. A fall tune-up before Rockingham County’s heavy heating season kicks in can mean fewer surprises when temperatures drop.
Signed workmanship warranty coverage applies to maintenance and replacement work, not just new installations. We also run monthly promotions on scheduled services, so ask about current offers when you call.
Heat Pump Repair & Installation for Year-Round Comfort
Heat pumps handle both heating and cooling from a single system, making them a practical fit for New Hampshire’s four-season climate. Cornerstone Services handles heat pump repair, installation, and maintenance for residential and commercial properties in Londonderry. We also install ductless mini-splits, which offer zone-specific temperature control and can be a strong option for spaces where running new ductwork isn’t feasible.
Per-job pricing and a signed workmanship warranty apply to heat pump and mini-split work just as they do across every other service we provide. For larger installations, financing options are available. Ask about current terms when you schedule.
Plumbing, Electrical & Home Modifications in Londonderry
HVAC is only one part of what Cornerstone Services handles. Through the same company and the same call, Londonderry residents can also reach us for plumbing services, electrical services, and our dedicated home modifications division. That division covers wheelchair ramp installation, grab bar installation, stairlift installation, kitchen modifications for elderly residents, and smart home setup for elderly and disabled clients. It’s a bundled offering that’s uncommon to find alongside HVAC, plumbing, and electrical under one provider.
Every service line operates under the same background-checked workforce, per-job pricing structure, and signed workmanship warranty. You coordinate one company, not four.
Ready to schedule? Cornerstone Services offers same-day availability, per-job pricing with no surprises, and a signed warranty on every completed job. We’ve earned more than 1,250 five-star reviews across Google, HomeAdvisor, Facebook, and Yelp. Financing options and monthly promotions are also available.
Contact us today to book your HVAC service or call us at (603) 874-1402.
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