Heating & Cooling

Furnace Replacement in Manchester, NH

What it costs, what moves the price, and what replacing a furnace in a mill-era Manchester house actually involves.

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What furnace install costs in Manchester, NH

$7,250 to $8,650

The middle half of the 18 furnace replacements we completed in Manchester, as of October 2026. A quarter came in under $7,250 and a quarter ran above $8,650.

That is our own job history in Manchester, NH, not a national average and not a teaser price. It excludes sales tax. We publish it because you cannot plan around "call for pricing," and because a number we have to stand behind keeps us honest. Your quote is fixed before any work starts, and what moves it is covered below.

Why the Manchester band is tighter than most

Of every town we publish a furnace number for, Manchester has the narrowest spread. The middle half of our work here lands inside about $1,400. That is not a pricing policy, it is a reflection of the housing stock: a large share of Manchester furnace replacements are like-for-like swaps in houses that already have ductwork and already have a flue that works, so there is less that can surprise anyone on the day.

Where a Manchester job does get more expensive, it is almost always one of three things: the existing ducting was built for a gravity furnace and will not move the air a modern unit expects, the venting has to be rerouted because the new unit is condensing and needs to go out a sidewall, or there is no gas at the street and the real decision is a different one entirely.

Oil is still the system we most often replace here

Across the Manchester jobs where we recorded a fuel, oil comes up more than natural gas and propane combined. That matches what the city looks like from a basement: a lot of mill-era housing that was converted from coal to oil and never converted again.

If you are on oil and a gas main runs down your street, replacing the furnace is the moment to decide, because doing it later means paying for the same labour twice. The conversion is its own job with its own economics and we have written it up separately - see oil-to-gas conversion. The short version is that the equipment cost is similar, the difference is the gas service, the line, and abandoning or removing the tank. We will tell you what the street actually has before you commit either way.

If there is no main, propane and a high-efficiency furnace is usually the better answer than another oil unit, and a cold-climate heat pump paired with the furnace is worth pricing. We will quote both rather than assume.

Sizing starts with a heat loss calculation, not the old nameplate

The most common thing we find on a Manchester replacement is an oversized furnace. A house that had 120,000 BTU in 1975 has usually had windows, insulation or an attic done since, and often needs a good deal less. An oversized furnace short-cycles: it heats the thermostat fast, shuts off, and leaves the far rooms cold, which is why the upstairs of a three-decker is always the complaint.

We run a room-by-room heat loss calculation before we quote. It takes longer than reading the old label and it is the single biggest difference between a furnace that solves the problem and one that reproduces it.

What moves the price

Efficiency. A condensing furnace costs more up front and needs different venting. On a house staying put for a decade it usually pays back; on one being sold in two years it often does not.
Venting. Moving from an atmospheric unit on a masonry chimney to a condensing unit means PVC out a sidewall and, often, relining the chimney for the water heater that is still using it. That second part gets missed in cheap quotes.
Ductwork. Gravity-era trunks and undersized returns are common here. Sometimes a return added in the right place fixes a decade of complaints for a few hundred dollars.
Access. Narrow bulkheads and tight mill-house basements add labour. We look before we price.
Combustion air. Tightening a house up without giving the appliance air to burn is both a comfort and a safety problem, and code is specific about it.

Rebates and what changed for 2026

The federal 25C energy-efficiency tax credit expired at the end of 2025, so there is no federal credit on a 2026 furnace replacement. That is worth knowing before a salesperson tells you otherwise.

New Hampshire incentives run through NHSaves, the joint programme of the state's electric and gas utilities, and the amounts move between programme years. We confirm what is actually available on the day we quote rather than printing a number here that is out of date by the time you read it.

How replacement day runs

Most Manchester furnace swaps are one day. The crew protects the route in, shuts down and drains where needed, removes the old unit, sets and levels the new one, makes the gas or oil connection, runs the venting, wires the control, and starts the system up. Before anyone leaves we check manifold pressure, temperature rise across the heat exchanger and static pressure in the ducts, because a furnace that is in but not commissioned is not finished. You get the readings, the registration, and the permit close-out.

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