It’s the perfect time to reap the benefits of high-velocity HVAC technology in Southern New Hampshire.

For owners of older or architecturally challenging homes, you no longer need to rely on window cooling units, electric space heaters, or cumbersome methods of temperature control. You can maintain both aesthetics and comfort without tearing down walls or draining your budget. As a Unico dealer, you can count on us for the most reliable systems.

Expert High Velocity HVAC Service, Repairs & Installations

High-velocity or “small-duct” heating/cooling systems utilize flexible, narrow ducts that can be routed through existing walls, floors, and ceilings without causing damage. The smaller size of equipment not only minimizes intrusion but improves efficiency and reduces running costs. These innovative systems customize to suit your particular space, budget, and goals. Give the professionals from MASI Plumbing, Heating & A/C a call for a free estimate, flat rate pricing, and a system tailored to your home.



Some of the many advantages of High Velocity HVAC Systems include:

  • Accommodates zones for a single room or an entire floor
  • Draft-free comfort
  • Energy efficient heating AND cooling
  • Floor to ceiling temperature varies by no more than two degrees
  • Insulated tubing minimizes air loss from air handler to room
  • No need to tear into walls for installation
  • Options for vent styles cater to decor
  • Precision control over temperature
  • Quick installation process
  • Remove up to 30% more humidity than conventional systems

Serving Southern New Hampshire

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

HVAC RepairHVAC Installation

High Velocity HVAC & HVAC Service Nashua, NH, Milford, NH, Merrimack, NH, Hudson, NH & Amherst, 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!