Furnace and Boiler Replacement Cost in Greater Hartford (2026)

Most Greater Hartford homeowners pay $5,000 to $10,000 to replace a standard gas furnace and $8,000 to $19,000 to replace a boiler. Those numbers run higher than most national cost calculators. This guide covers what each type of job includes, why Connecticut prices tend to be higher, and what to look for on a quote.

Furnace and boiler replacement cost in Greater Hartford: quick answer

These are typical installed ranges for homes in Hartford, West Hartford, Bloomfield, Avon, Simsbury, Farmington, and Windsor. They are market estimates, not quotes. A simple swap usually lands near the low end of a row. A job that also involves new venting, piping, a fuel change, or a water heater lands near the high end.

Replacement	Typical installed range (Greater Hartford)	What it usually covers
Standard gas furnace	$5,000 to $10,000	Same fuel, existing ductwork, usable venting
High-efficiency (condensing) gas furnace	$8,000 to $14,000	New PVC venting, condensate drain, possible gas line work
Oil furnace	$7,000 to $12,000	Burner, oil line, combustion setup, chimney inspection
Standard gas boiler	$8,000 to $16,000	Boiler, near-boiler piping, controls, venting
High-efficiency condensing boiler	$10,000 to $19,000	Direct venting or liner, condensate handling, new controls
Boiler plus indirect water heater	$13,000 to $24,000	Boiler, storage tank, zone piping, circulators
Oil boiler	$10,000 to $19,000	Boiler, burner, tank inspection, chimney work
Oil-to-gas conversion	$12,000 to $25,000+	Gas service, venting, tank removal, full mechanical rebuild

Why Connecticut costs more than national averages

Angi and HomeAdvisor both put the national average for boiler installation at about $5,900, and Angi’s range runs from $600 to $12,000. Those averages include a lot of simple, same-system replacements, which Angi says take four to six hours. Switching system types can take a few days. More Connecticut jobs fall into that second group, for two main reasons.

Older homes. Connecticut’s median home was built in 1967, compared with 1980 nationally, according to the Census Bureau’s American Community Survey. Older homes are more likely to have original piping, masonry chimneys, tight basements, and old pipe insulation, all of which can add work to a replacement.

More oil heat. Fuel oil heats 37.0% of Connecticut homes, compared with 4.1% nationally, per the same survey. Replacing an oil system can involve burner and oil-line work, combustion testing, tank inspection or replacement, chimney work, and removing a heavy cast-iron unit.

What drives the price

Five items explain most of the gap between a lower and a higher quote: chimney lining, near-boiler piping and controls, an indirect water heater, oil tank work, and asbestos. Each one depends on your house, so each should show up as its own line on a quote.

Chimney liner. A new appliance often can’t vent safely into an old masonry chimney, especially a condensing unit, which produces cooler, wetter exhaust. HomeAdvisor puts professional liner installation at $1,500 to $5,000, with an average around $2,500. In one Connecticut homeowner’s boiler quote shared on Reddit, chimney lining was about $3,000 of a $19,320 total.

Near-boiler piping and controls. Some jobs connect the new boiler to the existing piping. Others rebuild that connection with new headers, circulators, zone valves, an expansion tank, and controls. This is the biggest variable in boiler pricing.

Indirect water heater. Many boiler quotes include a storage tank for household hot water. It’s a second appliance with its own piping and controls, so compare it against other quotes that include one.

Oil tank work. Inspecting, replacing, removing, or abandoning an existing tank, plus disposal. A fuel conversion always includes it.

Asbestos. Older boilers and steam systems can have asbestos in pipe insulation, fittings, or gaskets. The cost depends on how much material is involved. The usual order is testing first, then a written abatement scope, then licensed removal where required.

How to compare quotes

A high quote isn’t necessarily a bad one. A complex boiler job in an older Connecticut home can reasonably run $15,000 or more, while a same-fuel, same-location swap with a usable chimney should come in much lower. These steps help you tell which kind of job you’re looking at:

• Ask for an itemized quote. Equipment, labor, venting or chimney work, piping and controls, permits, disposal, and any tank or asbestos work should each be a separate line.
• Compare the same scope. If one quote includes a liner and an indirect tank and another doesn’t, the price difference may be scope, not markup.
• Ask for a Manual J heat loss calculation. Sizing by square footage, or by matching the old unit, often leads to oversized equipment in older homes. The right size may be smaller and cheaper.
• Check the license and permit. Connecticut licenses HVAC and plumbing contractors through the Department of Consumer Protection, and heating replacement needs a permit and inspection.
• Ask about anything that doesn’t fit your system. A chimney liner makes sense for a condensing unit or an unlined flue. It doesn’t make sense for a direct-vent unit that doesn’t use the chimney.

Furnace or boiler: which one are you replacing?

Almost always the one you already have. Switching from a furnace to a boiler, or the reverse, means replacing the ductwork or piping throughout the house. Boilers generally cost more to replace because of the piping, controls, and indirect water heater that often come with them. Our guide to choosing a heating system in Connecticut compares boilers, furnaces, heat pumps, and ductless mini-splits.

What Connecticut rebates pay in 2026

Connecticut’s rebates for gas furnaces and boilers ended on December 31, 2024, and the federal tax credit ended on December 31, 2025. Heat pumps are now the main replacement option with incentives attached.

According to Connecticut Natural Gas, the Energize Connecticut sponsors are “discontinuing rebates and incentives for natural gas equipment as of December 31, 2024.” The only gas-side item still listed is a $35 instant discount on an ECM boiler circulator pump. The federal 25C credit doesn’t apply to equipment installed after December 31, 2025, so a 2026 furnace or boiler doesn’t qualify. Check your own situation with a tax professional.

For heat pumps, Energize CT’s Residential Energy Optimization Incentive pays $1,500 per ton for installations from September 1, 2026, up to $10,000, when the heat pump replaces gas, oil, propane, or electric resistance heat. You need to be an Eversource or UI residential electric customer, the equipment must be on the Heat Pump Qualified Product List, the installer must be in the Energize CT Heat Pump Installer Network, and projects may be selected for inspection. If a heat pump could work in your home, it’s worth getting a price before you decide.

Frequently asked questions

How much is a new furnace or boiler for a 2,000 square foot house?

Square footage alone doesn’t set the price. A Manual J heat loss calculation looks at insulation, windows, ceiling height, air sealing, and layout, so two homes of the same size can need different equipment. Installation details usually affect the price more than size does.

Should a 25-year-old furnace or boiler be replaced?

Not automatically. A well-maintained cast-iron boiler can have years of service left at 25, while a 25-year-old furnace is near the end of its expected life. Safety, efficiency, repair history, and parts availability decide it. If it needs work rather than replacement, our heating repair team can take a look.

Do I need a permit to replace a furnace or boiler in Greater Hartford?

Yes. Replacing heating equipment requires a mechanical permit and inspection, and each town sets its own fees, usually based on the value of the job. Your contractor should pull the permit and list it on the quote.

Get a real number for your home

Ranges help with budgeting, but the actual cost depends on your system, venting, piping, and fuel. Boisvert Plumbing & Mechanical Services has served Greater Hartford homeowners for more than 30 years. We’ll look at your setup and walk you through your options and what each one costs before any work starts. Contact us to schedule an assessment, or read more about our heating installation work.