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Furnace Installation & Replacement in Bellingham, MA

Gas and oil furnace installation and replacement for Bellingham and MetroWest — sized with a real heat-loss calculation, priced in writing, permits pulled.

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

Hannon Heating & Air Conditioning installs and replaces gas and oil furnaces in Bellingham, MA and the MetroWest towns around it. We size the new furnace with a real heat-loss calculation, put the full price in writing before work starts, and pull the permits ourselves. Estimates on system replacements are free. We do this work in Franklin, Millis, and Plainville as well as Bellingham.

Sizing Is Most of the Job

Plenty of furnaces around here were sized by square footage, or by copying the label on the unit being hauled out. That is how a house ends up with a furnace that roars for five minutes, shuts off, and leaves the back bedrooms cold anyway. We run a heat-loss calculation instead: windows, insulation, air leakage, ceiling heights. A drafty 1950s ranch and a tight 2005 colonial with the same floor plan need very different furnaces. An oversized furnace short cycles, which wastes fuel and wears out igniters and blower motors; a right-sized one runs longer, quieter cycles and heats the whole house evenly.

Bryant gas furnace with galvanized flue and plenum installed in a laundry room

80% or 95%-Plus? What Efficiency Buys You Here

The Massachusetts heating season runs from October into April, and that long season is the honest argument for high efficiency: a 95%-plus condensing furnace burns roughly fifteen percent less fuel than an 80% unit for the same heat, and the difference compounds over six months a year. The two also vent differently, which shapes the install. A condensing furnace vents through PVC pipe out the sidewall and drains condensate; an 80% furnace vents up the chimney. On oil, the efficiency spread between models is narrower — and if a gas main already runs down your street, it can be worth pricing an oil-to-gas conversion at the same time, since replacement is the cheap moment to switch. We put the options in the estimate and let you pick.

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.

Chimney Work, Included in the Quote Up Front

A furnace replacement often touches the chimney, and it is the part of the job many quotes leave out. An 80% furnace venting into an older masonry chimney may need a stainless steel liner to draft safely. Sidewall-venting a new condensing furnace creates a different issue: a water heater that shared the old flue gets orphaned on a chimney now far too big for it, which invites condensation damage and weak draft, and it usually needs a liner of its own. We check the chimney during the estimate and write any liner work into the quote, so the number you approve is the number you pay.

What Replacement Day Looks Like

A straightforward furnace swap takes one day: old unit out in the morning, the new furnace set and connected, venting and fuel line hooked up, then fired, combustion-tested, and heating the house by evening. Jobs that add duct modifications or a chimney liner run longer, and we say so before we start. If your furnace has already quit in a cold snap, tell us when you call — a house with no heat gets scheduled differently. And if you are not sure the old furnace is actually done, start with furnace repair; when a fix is the smarter money, that is what we will tell you. Request a free replacement estimate and we will come measure the house.

1

Morning

Old unit out, the new furnace set and connected.

2

Hook-up

Venting and fuel line connected.

3

By evening

Fired, combustion-tested, and heating the house.

Frequently Asked Questions

How long will I be without heat during a furnace replacement?
Usually one day. We pull the old furnace in the morning and have the new one heating the house that evening. Duct changes or chimney liner work can add a day, and we tell you that in the estimate. In winter we plan the swap so the heat is down for as short a stretch as we can manage.
Is a 95%+ high-efficiency furnace worth it in Massachusetts?
Usually, yes. The heating season here is long enough that burning roughly fifteen percent less fuel adds up year after year, so payback comes faster than it would in a mild climate. The tradeoffs are a higher upfront cost and PVC sidewall venting instead of the chimney. We quote both and show you the difference for your house.
How do you figure out what size furnace my house needs?
With a heat-loss calculation, not a rule of thumb. We measure the house and factor in windows, insulation, and air leakage, because a drafty older home needs more furnace than a tight new one with the same footprint. Copying the old furnace's size repeats whatever mistake the last installer made — oversizing is the one we find most.
Will replacing my furnace mean chimney work too?
Sometimes, and we tell you before you sign. An 80% furnace may need a stainless liner in an older chimney, and sidewall-venting a new high-efficiency furnace can leave a water heater alone on an oversized flue that no longer drafts right. Either scenario goes into the written quote, priced with the job.
Are there rebates or credits for a new furnace?
Programs change year to year, so check with your utility about current offerings before you sign anything. We quote the equipment honestly on its own numbers either way, and we will tell you plainly whether a high-efficiency model earns its extra cost in your house.

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