Merrimack, NH, is a small town with big scenery, exciting attractions and all sorts of activities. Along with locally owned breweries and a variety of exceptional restaurants, there’s the picnic pavilions and trails of Watson Park. Ice skate in the winter, play volleyball in the summer and relax year round in this peaceful wonderland. Nearby Wildcat Falls Park and Conservation Area is perfect for all levels of hikers, showcasing the Wildcat Falls and a wide variety of beautiful flora and fauna.

A Local HVAC Company & Plumber

From the hot summers to freezing cold and snowy winters, Merrimack experiences the extremes of every season. At MASI Plumbing, Heating & A/C, our job is all about making perfect comfort affordable, reliable and convenient. We focus on everything from temperature control and air quality to water heating, water filtration and generators. For air conditioner repairs, furnace installation, clogged drains, bathroom remodels and oil to gas conversion, give us a call at (603) 889-2331.

Contact MASI Plumbing, Heating & A/C for Heating, AC & Plumbing

MASI Plumbing, Heating & A/C covers an extensive list of professional residential services. Our expertise caters to the specific needs of all ages, layouts, square footage and unique challenges of the home. Ask us about high-efficiency hybrid heating, ductless mini-splits, boilers, indoor air quality accessories, smart thermostats or tankless water heating. For new installations or upgrades, benefit from the latest innovations. Know that we include emergency availability for problem-solving anytime you need us. We provide prompt service across Nashua, Milford, Amherst, Hudson, & Merrimack, NH.

Serving Southern New Hampshire

  • Wilton
  • Milford
  • Amherst
  • Mont Vernon
  • Brookline
  • Hollis
  • Nashua
  • Hudson
  • Litchfield
  • Bedford
  • Manchester
  • Derry
  • Londonderry
  • Windham
  • Pelham
  • Salem

Furnace ReplacementPlumbingHVACFurnace Repair ∴ Merrimack, NH

AC Replacement, Heating & Cooling & Heating Repair in Merrimack, 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!