# GSMS Air•Heating•Plumbing

> Great Service Makes Sense

Use the links below to find authoritative information published by this website.

## Key Pages

- [Home](https://www.gsmsnh.com/): Great Service Makes Sense
- [Heat & Air](https://www.gsmsnh.com/heating-air-conditioning/)
- [AC Repair](https://www.gsmsnh.com/ac-repair/)
- [AC Installation](https://www.gsmsnh.com/ac-installation/)
- [AC Maintenance](https://www.gsmsnh.com/ac-maintenance/)
- [Furnace Installation](https://www.gsmsnh.com/nh-furnace-system-installation-replacement/)
- [Furnace Repair](https://www.gsmsnh.com/furnace-repair/)
- [Furnace Maintenance](https://www.gsmsnh.com/furnace-maintenance/)
- [Boiler Installation](https://www.gsmsnh.com/boiler-installation-replacement/)
- [Energy Kinetics Boiler](https://www.gsmsnh.com/energy-kinetics-boiler/)
- [Mitsubishi Mini-Splits](https://www.gsmsnh.com/mitsubishi/)
- [Mini-Split Heat Pump](https://www.gsmsnh.com/ductless/)
- [Ductless Mini-Split AC Installation](https://www.gsmsnh.com/ductless-mini-split-ac-installation/)
- [Lennox](https://www.gsmsnh.com/lennox/)
- [Smart Thermostats](https://www.gsmsnh.com/smart-thermostats/)
- [Indoor Air Quality Services](https://www.gsmsnh.com/indoor-air-quality-services/)
- [UV Air Purifier Installation](https://www.gsmsnh.com/uv-air-purifier-installation/)
- [Whole-Home Humidifier Installation](https://www.gsmsnh.com/whole-home-humidifier-installation/)
- [Plumbing](https://www.gsmsnh.com/plumbing/)
- [Water Heater Replacement](https://www.gsmsnh.com/water-heater-replacement/)
- [Water Heater Repair](https://www.gsmsnh.com/water-heater-repair/)
- [Tankless Water Heaters](https://www.gsmsnh.com/tankless-water-heater-installation-replacement/)
- [Heat Pump Water Heater Installation](https://www.gsmsnh.com/heat-pump-water-heater-installation/)
- [Kitchen & Bathroom Plumbing ](https://www.gsmsnh.com/kitchen-bathroom/)
- [Kitchen Plumbing](https://www.gsmsnh.com/kitchen-plumbing/)
- [Water Quality Services](https://www.gsmsnh.com/water-quality-services/)
- [RO Systems](https://www.gsmsnh.com/reverse-osmosis-water-systems/)
- [Water Filtration Systems](https://www.gsmsnh.com/water-filtration-systems/)
- [Water Sediment Filtration](https://www.gsmsnh.com/water-sediment-filtration/)
- [Water Softener Systems](https://www.gsmsnh.com/water-softener-systems/)
- [About](https://www.gsmsnh.com/about/)
- [Meet Our Team](https://www.gsmsnh.com/team/)
- [GSMS Home Club](https://www.gsmsnh.com/club/)
- [Pricing](https://www.gsmsnh.com/pricing/)
- [HVAC Pricing](https://www.gsmsnh.com/hvac-pricing/)
- [Plumbing Pricing](https://www.gsmsnh.com/plumbing-pricing/)
- [Financing](https://www.gsmsnh.com/finance/)
- [Feel The Love](https://www.gsmsnh.com/feel-the-love/)
- [WOW Warranty](https://www.gsmsnh.com/wow/)
- [Careers](https://www.gsmsnh.com/careers/)
- [Coupons & Specials](https://www.gsmsnh.com/specials/)
- [Learning Center](https://www.gsmsnh.com/learning-center/)
- [We ❤ Local](https://www.gsmsnh.com/we-heart-local/)
- [Service Area](https://www.gsmsnh.com/service-area/)
- [Manchester, NH](https://www.gsmsnh.com/service-area/hvac-and-plumber-manchester-nh/)
- [Barrington, NH](https://www.gsmsnh.com/service-area/hvac-and-plumber-barrington-nh/)
- [Hollis, NH](https://www.gsmsnh.com/service-area/hvac-and-plumber-hollis-nh/)
- [Hooksett, NH](https://www.gsmsnh.com/service-area/hvac-and-plumber-hooksett-nh/)
- [Merrimack, NH](https://www.gsmsnh.com/service-area/hvac-and-plumber-merrimack-nh/)
- [Nashua, NH](https://www.gsmsnh.com/service-area/hvac-and-plumber-nashua-nh/)
- [Contact](https://www.gsmsnh.com/contact/)

## Resources

- [XML Sitemap](https://www.gsmsnh.com/sitemap_index.xml): Machine-readable index of published content.

## Optional

- [Well Water Humidifiers & UVC vs. Regular Air Purifiers](https://www.gsmsnh.com/well-water-humidifiers-uvc-vs-regular-air-purifiers/): Dealing with well water? Why the Aprilaire 800LC matters (plus: UVC vs. regular air purifiers) If you’re on a private well anywhere from Manchester to Bedford, Derry, or Londonderry, you’ve probably already dealt with one water quality surprise or another. What a lot of well water homeowners don’t expect is that the same water can […]
- [How to fix a Lennox thermostat A2L sensor fault code](https://www.gsmsnh.com/how-to-fix-a-lennox-thermostat-a2l-sensor-fault-code/): Quick answer: A Lennox thermostat A2L sensor fault code, often shown as Alarm ID 163, means the system’s Refrigerant Detection System (RDS) sensed a change in the air and safely paused the equipment to protect your home. It can be a harmless nuisance trip from household fumes, a real refrigerant leak, or occasionally a faulty […]
- [Why Lennox Healthy Climate Uses UVC, Not Standard UV Light](https://www.gsmsnh.com/why-lennox-healthy-climate-uses-uvc-not-standard-uv-light/): If you’ve shopped around for a UV air purifier for your Manchester, NH home, you’ve probably noticed the listings don’t say much. A lot of products just say “UV light” and leave it there. That gap matters more than most homeowners realize, because not every UV light works the same way, and the wrong kind […]
- [Why Mini-splits and Boilers Can’t Support Whole-Home Air Quality Add-ons](https://www.gsmsnh.com/why-mini-splits-and-boilers-cant-support-whole-home-air-quality-add-ons/): If you’re running a ductless mini-split system or heating with a boiler, whole-home humidifiers and UV air purifiers are worth understanding before you shop for them. These add-ons depend on something your system may not have: ductwork. Why humidifiers and UV air purifiers live inside your ductwork Whole-home humidifiers (steam vs. bypass humidifiers) and UV […]
- [New Homeowner? Check for a Hidden Humidifier](https://www.gsmsnh.com/new-homeowner-check-for-a-hidden-humidifier/): Do you even know you have a humidifier? What new homeowners should check If you just bought a home in southern New Hampshire, there’s a good chance it came with a whole-home humidifier you don’t know about. It happens more than people expect: a previous owner had one installed, nobody mentioned it at closing, and […]
- [Take Advantage of NH Rebates for Heat Pump Water Heaters](https://www.gsmsnh.com/take-advantage-of-nh-rebates-for-heat-pump-water-heaters/): Your next water heater will probably need to be a heat pump. Here is what NH homeowners should know now. If your water heater is pushing 10 years old, you are in the window where most homeowners start paying closer attention to it. Hot water is one of those things you do not think about […]
- [Why your fixtures have white buildup or rust stains (and what to do about it)](https://www.gsmsnh.com/why-your-fixtures-have-white-buildup-or-rust-stains-and-what-to-do-about-it/): Understanding Hard Water and Iron Stains in Your Home You scrub the toilet bowl, and a week later, the stain is back. You wipe down the faucet, and that crusty white ring reappears around the base. You are not cleaning wrong. Your water is doing this. Here is what is actually going on and what […]
- [Heading to trade school or college? This BBB scholarship deadline is June 30](https://www.gsmsnh.com/heading-to-trade-school-or-college-this-bbb-scholarship-deadline-is-june-30/): Here’s one we don’t want anyone in our corner of New Hampshire to miss. The Better Business Bureau Serving New Hampshire is accepting applications for its 2026 Robert M. Shomphe Scholarship, and the deadline is June 30, 2026. That’s right around the corner, so if you or someone in your family qualifies, now’s the time. […]
- [Why we won the BBB Torch Award (and why it matters to your home)](https://www.gsmsnh.com/why-we-won-the-bbb-torch-award-and-why-it-matters-to-your-home/): Why we won the BBB Torch Award (and why it matters to your home) GSMS is thrilled to announce that we have been honored as a 2026 BBB Torch Award for Ethics winner by the Better Business Bureau Serving New Hampshire. As a second-generation family business providing dedicated service to New Hampshire since 1987, we […]
- [Why does my well water smell like rotten eggs?](https://www.gsmsnh.com/why-does-my-well-water-smell-like-rotten-eggs/): A common New Hampshire problem you can fix for good You turn on the tap, and there it is. That unmistakable rotten egg, sulfur-like smell. It’s unpleasant, a little alarming, and weirdly common around here. If you’re on a private well in New Hampshire, you’re far from alone. Here’s what’s actually going on, whether you […]