Call us now and we'll work to schedule a technician the same day, across every trade we handle.
Book A ServiceIndoor Air Quality in Londonderry, NH
Full-Service IAQ Inspections, Duct Cleaning, & Air Treatment
The air inside your home can carry more than you’d expect. New Hampshire homes sealed tight through the long heating season trap dust, pet dander, mold spores, pollen, and volatile organic compounds (VOCs) with nowhere to go. At Cornerstone Services, we provide residential and commercial indoor air quality services throughout southern New Hampshire, with licensed and insured technicians handling everything from initial inspection through installation and cleanup under one roof.
Our IAQ services include indoor air quality inspections, air duct cleaning, whole-home air purifiers, UV germicidal lights, HEPA and high-efficiency filtration, dehumidifiers and humidity control, and ventilation system assessment. Whatever the source of the problem, we diagnose it and address it directly. And because we handle electrical, plumbing, HVAC, cleaning, and handyman work under one warranty and one pricing structure, any related issue that surfaces during an inspection doesn’t require a second call to a separate contractor.
We’ve earned more than 1,250 five-star reviews across Google, HomeAdvisor, Facebook, and Yelp, one job at a time. That kind of track record doesn’t come from showing up and doing the minimum.
Ready to breathe easier? Call (603) 874-1402 or visit our Contact Us page to schedule your indoor air quality inspection in Londonderry, NH.
Air Duct Cleaning Services in Londonderry, NH
When your HVAC system runs, it pulls air through your ductwork. When those ducts carry years of accumulated dust, debris, or biological contaminants, they can push those particles back into your living or working space with every cycle. Our air duct cleaning service addresses that directly: we inspect the ductwork to identify problem areas, then remove dust and debris using advanced cleaning techniques before sanitizing all duct components.
Duct cleaning is worth prioritizing if you’ve noticed persistent dust buildup on surfaces, recurring odors that don’t have an obvious source, or uneven airflow from your vents. It’s also a smart step after any major renovation, when construction debris can settle deep into the system. We serve both residential and commercial properties in Londonderry and the surrounding area, and we bring the same thorough process to each job, regardless of property size.
Why Londonderry Homeowners Choose Cornerstone Services
There’s no shortage of HVAC and air quality companies in the region. Here’s what sets us apart:
- Over 1,250 five-star reviews: Verified across Google, HomeAdvisor, Facebook, and Yelp and not self-reported.
- Per-job pricing: The number we quote is the number you pay at completion. No hourly overruns, no hidden fees, no surprises.
- Signed workmanship warranty: Every completed job is backed by a written warranty under our quality assurance policy.
- Same-day service available: When you need help quickly, call us and we’ll work to get someone out the same day.
- On-time arrivals: Our service vehicles are staged from multiple locations so technicians can get to you when scheduled, not hours later.
- Background-checked workers: Every technician sent to your property has cleared a background check before walking through your door.
- Financing available: Ask about current financing terms when you schedule.
- Monthly promotions: Rotating special offers give you opportunities to save on scheduled services.
- 24/7 availability: Our team is on call around the clock for scheduling, questions, or urgent needs.
- Tidy job sites: Our technicians clean up after every job and leave your property the way they found it.
The single-provider advantage matters most when one problem reveals another. If a duct cleaning uncovers an airflow issue tied to a failing component, or an air quality inspection surfaces a ventilation problem that needs electrical or HVAC work, our team can handle it. You don’t coordinate a second contractor or wait on a new estimate. One call, one team, one warranty.
Schedule your indoor air quality service today by visiting our Contact Us page or calling (603) 874-1402. Our technicians serve Londonderry, NH, and surrounding communities across southern New Hampshire and northern Massachusetts.
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