Rheem AC

With 55 years of dedicated service in Southern New Hampshire

MASI Plumbing, Heating & A/C knows exactly what it takes to earn your long-term satisfaction. If you’re thinking of installing new or upgrading outdated residential cooling equipment, look no further.

Air Conditioner Installation in Merrimack, NH | AC Installation


We deliver affordable solutions through top quality products, customized sizing, and meticulous installation procedures. As a local and family owned and operated HVAC contractor, we are a part of your community. We take pride in uncompromising standards of job performance and unmatched results. At MASI Plumbing, Heating & A/C, we maximize return from your energy dollar.

When you need an air conditioner installation done right, look no further than MASI Plumbing, Heating & A/C!

Reach out to us at (603) 889-2331 for free estimates on air conditioner installation. We accommodate your busy schedule, avoid surprises with flat rate pricing, and offer a wide range of options to meet your specific demands. Browse innovations from industry leading manufacturers such as Amana, Goodman, Rheem, and more. Doesn’t matter the age, size, or layout of your space, MASI Plumbing, Heating & A/C answers with sophisticated technology to minimizes running costs, operational sounds, and impact on the environment. Our licensed technicians deliver ideal comfort to homes and businesses throughout 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
  • Merrimack

Air Conditioner InstallationAC Replacement

AC Installation & Air Conditioning Installation Nashua, NH, Milford, NH, Merrimack, NH, Amherst, NH & Hudson, 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!