MASI Plumbing, Heating & A/C defends against all manner of indoor air quality concerns in Southern New Hampshire.

Over our 60 years of dedication, we’ve resolved every imaginable issue with a wide range of homes. No matter the age, size, or layout of your residence, we deliver a convenient, effective, and whole-house solution. Knowledge is key. We take the time to test, evaluate, and develop a customized strategy. We tailor our recommendations to suit your specific situation and goals and answer with the most innovative technology on the current market.

Expert Indoor Air Quality Solutions

Family owned and operated, optimizing the health of your home is not only our business but our priority. Understanding the impact and importance of indoor air quality, we partner with industry-leaders to offer a broad selection of sophisticated products, including air purifiers, germicidal UV lamps, dehumidifiers, humidifiers, ventilation systems, and more. We further specialize in HVAC cleaning procedures and duct repair/maintenance.

Air Purifiers

Air Purifiers work silently, trapping and killing up to 95% of pathogens down to .30 micron in size, protecting the efficiency of the HVAC system, and allowing your family to breathe with total confidence in the health of your indoor environment. Reducing asthma and allergy triggers, air purifiers capture dust, pollen, dander, pet odors, tobacco smoke, dust mites, insects, mold spores, cooking odors, VOCs found in paints, aerosol sprays, auto products, and much more. 

Germicidal UV Lamps

Germicidal UV Lamps protect against mold spores, bacteria, viruses, and a long list of germs and allergens, keeping a cleaner home and HVAC system and healthier indoor air. Operating silently and installed in the air handler, UV lamps kill microbes as they pass through the system and before they contaminate breathing air.


Dehumidifiers run quietly, reduce dust, and regulate moisture levels, making the home far less welcoming to allergens, including dust mites, mold, and mildew. You’re going to breathe easier and feel more comfortable, allowing for higher thermostat settings, more efficient operation of the air conditioner, less wear and tear on components, and cost savings. 


Humidifiers significantly improve the health and comfort of the home, relieving issues such as chapped lips, excessive coughing, headaches, sore throat, itchy eyes, static electricity, and damage to home furnishings. Adding necessary moisture allows your family to breathe easier and feel warmer at lower thermostat settings, minimizing energy use, demands on the heating system, chance of malfunction, and monthly costs.

Energy Recovery Ventilators (ERVs)

Energy Recovery Ventilators (ERVs) and Heat Recovery Ventilators (HRVs) are designed to provide a whole-house solution, introducing fresh, pre conditioned, outdoor air into the home while expelling stale indoor air to ensure a cleaner, healthier, and more enjoyable living environment. Along with reducing the level of odors, chemical vapors, and contaminants, which can become trapped in a tightly sealed structure, these innovative options trim energy costs and optimize comfort.

Top Quality Duct Repair & Maintenance Services

Are you aware that the breathing air in your home circulates through the heating/cooling system approximately six times per day? The integrity of the duct system should be a priority. Over time, dust, mold, bacteria, and all sorts of harmful toxins can accumulate within the ducts, restricting air flow, increasing strain on HVAC equipment, and threatening your family’s health. Small holes or leaks at the seams allow conditioned air to escape, diminishing comfort and increasing energy bills. Everything from poor design to wear and tear impacts temperature control, air quality, budget, and the overall performance of heating and cooling equipment.

Some of the many benefits of improving Indoor Air Quality include:

Breathe with confidence

Clean air flowing through the home helps everyone, and especially those with respiratory problems and allergies, to breathe easier.

Combat odors

Poor airflow and filtration often promotes moisture, mold growth, and unpleasant smells throughout the home.

Restful sleep

Airborne contaminants negatively affect the quality of sleep, promoting breathing issues such as sleep apnea.

Eliminate allergens

Hay fever, itchy throat, irritated eyes, sneezing and coughing are often a reaction to dust, dander, pollen, mold spores, and cockroach debris.

Less cleaning

Air-born contaminants eventually fall onto flat surfaces, building up and requiring more dusting, vacuuming, and home maintenance.

Balanced humidity

Indoor humidity levels should be maintained around 45% to avoid issues with excessive moisture as well as overly dry air.

Lower energy bills

Optimizing airflow, ventilation, and humidity levels protects the integrity of the HVAC system and promotes superior equipment efficiency.

Minimize carbon footprint

When the HVAC system doesn’t need to work as hard, it uses less energy and reduces impact on the environment.

Indoor Air Quality Testing Hudson, NH & Indoor Air Quality Nashua, NH

At MASI Plumbing, Heating & A/C, we’re prepared to take on any heating, cooling or air quality challenge, and ensure sustainable results 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

Indoor Air Quality TestingIndoor Air Quality ∴ Milford, NH ∴ Merrimack, NH ∴ Amherst, NH

Indoor Air Quality & Indoor Air Quality Testing Milford, NH, Amherst, NH, Hudson, NH, Merrimack, 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!