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Air Conditioner Installation, Repair, and Replacement


Installing energy-efficient AC units for over 20 years.

If you need to install a central air conditioning system, please call us today. We look forward to serving you!

At Main Stream Mechanical, we travel throughout the greater Newburyport, Boxford, Topsfield, Bedford, Lexington, and Arlington areas in MA and the greater Derry, Seabrook, Stratham, Dover, Exeter, and Rye areas in NH.


See our full-service area list for towns not noted. Chances are we travel to yours. Call us today at (978) 834-0849 for a no-obligation consultation.

Do you need to install a new AC system?

If you’re tired of suffering through the heat of summer without AC, or just tired of lugging those window AC units in and out of the attic year after year, then perhaps a central AC unit from Main Stream Mechanical is exactly what you need to "beat the heat."

It’s not just those without central AC that may be in need, you may need to replace a currently installed unit if it is starting to fail. Your AC system should last 10 to 15 years, provided it is installed and maintained properly. However, performance may begin to suffer after 7 to 10 years, so it may be prudent to install a new central AC unit.

You should consider installing a new central AC system if you experience the following:

  • Your AC shuts off unexpectedly.

  • Your energy bills are rising unexpectedly during the summer months due to poor efficiency.

  • Your AC fails to cool your home properly.

  • Your HVAC technicians identify a number of different problems during the troubleshooting process.


As your trusted HVAC contractor we will diagnose problems with your system and help you decide if installing a new system is necessary.

Why you should trust Main Stream Mechanical with your central AC installation:

There are many reasons New England consumers trust Main Stream Mechanical for their AC installation needs.

Commitment to Quality

Massachusetts requires HVAC contractors to be licensed to handle refrigeration and ductwork. Unfortunately, many other companies hire unlicensed technicians that fail to match our standards of quality. Unlike these contractors, Main Stream Mechanical is committed to offering the highest quality service to our customers. Our technicians are highly trained to live up to our reputation.

Expert Recommendations

It can be difficult choosing an AC system that is safe, reliable, and energy-efficient. Our experienced comfort specialists and technicians will help you choose the right equipment for your home.

Adequately Insured

You don't need to worry about your AC system being mishandled. Our technicians are very responsible and we are insured in case any accidents occur.

Get the Right AC System for Your Needs & Budget

Home air conditioning systems have come a long way in recent years. No matter the size of your home, new and state-of-the-art technologies ensure there is an AC system just right for you, whether you're seeking to cool only one room or an entire, multi-level residence.

Central AC – Installing a central AC system is ideal for larger homes and residences with many rooms, as cool air is easily and quietly delivered directly from the source to each room in the house.


Ductless AC Units – Don't have an air duct system for central AC? No problem! A ductless air conditioning system provides many of the same benefits as central AC but without ductwork. These types of cooling systems are quiet, compact, and simple to operate.


Hi-Velocity AC systems – Unico systems offer high performance and superior comfort in homes where conventional cooling systems can't.  The flexible small ducts can be routed through existing ceilings, floors, and wall cavities without compromising the design or architectural integrity of your home.

Customer Testimonials

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