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Central AC Installation in Bellingham, MA

Central AC installation and replacement for Bellingham and MetroWest — sized to your actual house, quoted in writing, replacement estimates free.

Call (508) 282-1000 4.3 · 45 Google reviews

Hannon Heating & Air Conditioning installs and replaces central air conditioning in Bellingham, MA and the MetroWest towns around it. We size the system to your actual house with a Manual J load calculation, quote the full job in writing before work starts, and estimates on system replacements are free. We install central air in Franklin, Millis, and Medway as well as Bellingham.

New Bryant AC condenser installed on a pad beside a MetroWest home

Sizing Comes First: The Manual J Load Calculation

An air conditioner sized off square footage alone is a guess, and around here the guess usually runs big. We run a Manual J load calculation instead: window area and orientation, insulation levels, ceiling heights, sun exposure, the actual heat load of your house. Oversizing matters in New England because of humidity. A too-big unit blasts the temperature down and shuts off before it has run long enough to wring moisture out of the air, so the house sits at 72 degrees and still feels clammy. It also short-cycles, which wears out the compressor. The right-sized system runs longer, quieter cycles and dries the air while it cools.

What an Installation Involves, and How Long It Takes

A straight swap-out, new condenser and coil on existing ductwork, takes one to two days, and the house stays livable the whole time. Day one is removing the old equipment and setting the new; day two is line sets, wiring, and commissioning. Adding ductwork stretches the job, and we tell you by how much when we quote it. Every install ends the same way: we pull a vacuum on the lines, weigh in the refrigerant charge to the manufacturer's spec, test the system through full cycles, and walk you through the thermostat. We pull the permits ourselves, and Paul is on the job — the way it has worked since he founded the company in 2014.

1

Day one

Remove the old equipment, set the new condenser and coil.

2

Day two

Line sets, wiring, and commissioning — the house stays livable throughout.

3

Before we leave

Pull a vacuum, weigh in the charge to spec, test full cycles, walk you through the thermostat.

Weighing a replacement? The estimate is free.

Call (508) 282-1000 or request an estimate online — you get a written number before any work starts, and nobody gets pressured into a new system.

No Ductwork? You Still Have Options

Plenty of homes around here (older capes, plaster-wall colonials, houses heated by baseboard) have no ducts to connect to. The first option is adding ductwork, which works best where an attic or basement gives clean runs; in a plaster-wall antique it gets invasive fast. The second is going ductless: wall-mounted units that cool room by room through a three-inch hole in the wall, and the cold-climate models heat, too. We install both and will tell you plainly which one fits your house. The trade-offs are laid out on our ductless mini-split page.

The New Refrigerant: What R-454B Means for Your Purchase

As of 2025, new central AC equipment ships with low-global-warming-potential refrigerant (R-454B for most brands, R-32 for a few) replacing R-410A. For you as a buyer it changes less than the headlines suggest: the equipment cools the same, the maintenance is the same, and we are EPA certified for the refrigerant work either way. The practical difference favors replacing: parts and refrigerant for new systems are current production and easy to get, while R-410A for older systems is on a phase-down and gets pricier each year. Still weighing a repair instead? The math we use is on the AC repair page. Estimates on system replacements are free, so tell us about the house and we'll come take a look.

Refrigerant gauges connected to a condenser during commissioning

Frequently Asked Questions

Can I get central air in an older house with no ductwork?
Yes, two ways. Adding ductwork works well where an attic or basement gives clean runs; in a plaster-wall antique it means opening walls and ceilings. The alternative is a ductless mini-split system, which cools and heats room by room through a three-inch wall penetration. We look at the house and tell you which one actually fits.
How many days does a central AC install or replacement take?
One to two days for a straight replacement on existing ductwork. Day one is removing the old equipment and setting the new condenser and coil; day two is line sets, electrical, refrigerant charge, and testing. The house stays livable throughout. Adding new ductwork extends the job, and the estimate gives you the real timeline.
Is a bigger AC unit better for hot, humid summers?
No — oversizing is the most common installation mistake we correct. A too-big unit cools the air fast and shuts off before it has dehumidified, leaving the house cold but clammy, and the constant starting and stopping wears the compressor. Correct sizing comes from a Manual J load calculation of your actual house, and that's how we size every system.
What's the new refrigerant in current AC units, and does it change what I should buy?
New systems use R-454B for most brands, R-32 for a few. Cooling performance and maintenance are unchanged, and we're EPA certified for the new refrigerants just as for the old. Buy based on correct sizing and installation quality, the two things that actually decide how a system performs over its life.
What drives the cost of central air in a Massachusetts home?
Four things move the number: whether usable ductwork already exists, the load your house puts on the system, the efficiency tier of the equipment, and any electrical work the panel needs. We quote your actual house, not a square-footage chart, and the estimate on a replacement is free. Ask about our veteran, senior, and first-responder discounts.

Ready for a Straight Quote?

Estimates on system replacements are free — a load calculation, honest options, and a written number before any work starts.

(508) 282-1000 Request an Estimate

Mon-Fri 7am-5pm · Emergency Service Available