Heating Installation

Continuing 56 years of dedicated service in Southern New Hampshire

MASI Plumbing, Heating & A/C provides expert and affordable residential heating system installations. As a local and family owned and operated HVAC contractor, we take pride in high-efficiency comfort solutions and equipment upgrades.

Furnace Replacement & Furnace Installation in Merrimack, NH


We combine quality products with timely service and uncompromising standards of job performance to ensure optimum value from your energy dollar. Get in touch with us at (603) 889-2331 for free estimates, flat rate pricing, and a wide range of options from industry leading manufacturers such as Amana, Goodman, Rheem, and more.

Get top quality heating system installs & replacements from MASI Plumbing, Heating & A/C!

No matter the age, size, or layout of your space, we not only match your needs to the ideal system but take advantage of the innovations that reduce running costs, sound levels, and your carbon footprint. Our licensed technicians maximize comfort for home and business owners 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

We service all makes and models

  • TRANE
  • AMERICAN STANDARD
  • FUJITSU
  • BRADFORD WHITE
  • RINNAI
  • MITSUBISHI
  • NAVIEN
  • STATE
  • BOSCH
  • CARRIER/BRYANT
  • LENNOX
  • LG
  • YORK
  • BURNHAM
  • WEIL MCLAIN
  • BUDERUS
  • VIESSMANN
  • UTICA
  • KOHLER
  • TOTO
  • STERLING
  • MOEN
  • DELTA
  • GROHE

Maintenance Plans

Our technicians are New Hampshire licensed certified heating and cooling experts.

Maintenance Plan Details

Financing Options

Convenient monthly payments, with resolving line of credit you can use over and over again.

Finance your project

Furnace Replacement

Heating Installation & Furnace Installation Hudson, NH, Nashua, NH, Merrimack, NH, Milford, NH & Amherst, NH

Write a Review Write a Review

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!

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Furnace Replacement

Nashua, NH

Amherst, NH

Merrimack, NH

Milford, NH

Bedford, NH

Hollis, NH

Hudson, NH