Quality HVAC, Plumbing, and Bathroom Remodeling

MASI Plumbing, Heating & A/C

We offer Brands, Expertise, and Service you can Trust.

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Heating/Furnace
Air Conditioning
Plumbing
Bathroom Remodeling

MASI Plumbing, Heating & A/C continues to build on 55 years of dedicated service in Southern New Hampshire.

We are a family owned and operated company, and as a part of the local community, take a great deal of pride in offering superior solutions to residential heating, cooling, air quality, and plumbing challenges. We specialize in high-efficiency comfort solutions, remodeling, and replacement. With timely service, we keep your investment to a minimum while delivering unmatched return.

AC Installation in Nashua, NH | HVAC Repair


Give MASI Plumbing, Heating & A/C a call for flat rate pricing, free estimates, new installation, seasonal maintenance, and repair throughout Nashua, Milford, Amherst, Hudson, & Merrimack, NH. From full bathroom remodeling to water heaters, boilers, furnaces, heat pumps, air conditioners ductless units, and more, we have every demand covered.

We service all makes and models

Give our team a call for all your heating & cooling repairs, service & installations!

Our team upholds current gas and plumbing licenses and remains on-call 24 hours a day, 365 days a year to provide emergency repairs. Prioritizing your satisfaction, MASI Plumbing, Heating & A/C never settles for anything less than exceptional quality and peak performance from your essential equipment. We also offer an in-house location for the purchase of parts.

(603) 889-2331

AC InstallationAir Conditioning ServiceHeating & CoolingHVAC InstallationHVAC Service

HVAC Repair, Furnace Repair, Heating Service, AC Repair & Furnace Installation Hudson, NH, Merrimack, NH, Amherst, NH, Milford, NH & Nashua, NH

Paula L.

Came home to my central a/c not working. After checking a few things, I called Masi Plumbing, based off of consumer reviews here. The person who answered the phone was accommodating to my needs and had a service person here super promptly! The service person was very friendly, highly informative and fixed the issue promptly- and not at a high cost either! Will def be calling them for our needs again, and referring them as well. Thanks a million Masi Plumbing!

Susan C.

My pipes froze and burst on a Sunday evening. I called several plumbers who would not give me the time of day. MASI Plumbing to the rescue! They sent a plumber (Nick) out immediately who was able to repair the broken pipes that evening, even though though he had already worked all day! A huge thank you! I highly recommend MASI Plumbing and will be using them exclusively in the future.

Christine C.

Bought a new boiler system from them this year and they gave us the most comprehensive quote for the right work (pointed out the need for fresh air and a new oil line which we knew were needed) at a good price. Unfortunately one of our parts in the system failed, but they had it replaced and our system up and running within 2 hours, and covered under warranty, so no cost to us. They have always been very friendly, down to earth, but professional. Great to work with!