What We Do

We are New England’s leading HVAC contractor for Residential Heating and Cooling and Commercial HVAC systems.


Find out how Mitsubishi Electric ductless can transform your living space.



Learn how ductless can keep any commercial space comfortable.


Where We Do It

From Tudors to Colonials to split-level homes and more, we’ve installed ductless HVAC systems in all types of single-family homes, condos, brownstones and apartments in and around the Boston area.

Hear From Our Satisfied Customers:

Receive Up to $250 When You
Refer a Friend!

There are two ways to get rewarded. When your referred friend completes an installation over $6,000 you both will receive a $250 gift card. When your referred friend completes a service job over $225 you will both receive a $50 gift card.

Featured Services

We are the largest ductless contractor in New England with hundreds of ductless system installations.

N.E.T.R. Inc., in-house staff of certified HVAC/R technicians can install, service and repair your commercial refrigeration systems.

Maintenance Programs

Our highly trained HVAC technicians can maintain, tune up and/or repair your current system, so you can stay warm in the winter and cool in the summer. No sweat, No stress. An HVAC preventative maintenance ensures healthier air, fewer emergencies and a long-lasting system.

HVAC Insights

Explore our Heating and Cooling articles. Make sure to come back soon for more resources as you learn the best ways to heat and cool your home.

Wall Mounted Heat Pump

Get Your Air Conditioner Ready for Summer

Get your air conditioner ready for summer cooling with these tips. Avoid unexpected breakdowns and protect the lifespan of your AC equipment ...
Ductless HVAC Case Studies in Andover and North Andover

Ductless HVAC Case Studies in Andover and North Andover

Learn how residents of Andover and North Andover have benefited from ductless air source heat pumps. See why they switched from other options and look ...
Central HVAC Vs. Ductless HVAC

Central HVAC Vs. Ductless HVAC

Compare the differences between central and ductless HVAC. Look at the pros and cons and learn why ductless is more comfortable and efficient ...
Surprising Benefits of Heat Pump Systems in Spring

Surprising Benefits of Heat Pump Systems in Spring

Discover how ductless systems work and see the benefits of using a mini split during the spring. Call N.E.T.R., Inc. for heating and cooling services ...
5 Tips to Drop the Temperature ASAP

5 Tips to Drop the Temperature ASAP

Learn tips and tricks on how to cool off a room fast. Plus, find out where to get experienced help if your air conditioning isn't ...
Buying a Wall-Mounted Air Conditioner

Ductless HVAC in Multi-Family Homes in Massachusetts

Ductless HVAC can improve efficiency and comfort in multi-family homes, apartment buildings, and condos. Look at case studies and benefits now ...

Schedule an Emergency Service

We will provide you to with installation, repair or maintenance services that you require, all while providing excellent service.