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Lexington, Middlesex County

Oil to heat pump in Lexington, MA

31% of occupied Lexington homes heat with fuel oil (about 3,868 homes, margin of error about ±396), against 22.4% for Massachusetts. Your electricity is supplied by Eversource, so Mass Save heat pump rebates and the 0% HEAT Loan apply if you qualify.

Lexington has nearly 4,000 oil-heated homes, mostly in a large single-family housing stock. It is an Eversource town, so Mass Save rebates and the winter heat pump rate apply.

Lexington at a glance

Homes heated with fuel oil	31% (about 3,868)Massachusetts: 22.4%
Homes heated with utility gas	48.3%Where a gas main runs on your street, ask the gas utility too.
Homes heated with electricity	14.1%
Homes built before 1960	43.2%Massachusetts: 46.5%. Older homes more often need weatherization first.
Single-family detached	73.7%Massachusetts: 51.1%
Occupied homes	12,477

Source: Census ACS 2024 5-year, tables B25040, B25034 and B25024; margin of error is the 90% figure published with the estimate. Utility: MassDOT utility contacts and Mass.gov municipal electric list.

What applies in Lexington

Mass Save whole-home heat pump rebate: $2,650 per ton up to $8,500 (details and deadlines), through Eversource.
No-cost Home Energy Assessment, 75 to 100 percent off insulation, and a 0% HEAT Loan up to $25,000 (weatherization first).
Winter seasonal heat pump electric rate from Eversource once you have a heat pump (how it works).
No town-run heat pump program found. Mass Save (through Eversource) is the main program.

Estimate your Lexington home

The calculator below starts with Eversource as your utility and the state’s latest average oil price. Replace the defaults with your own gallons and bill. We do not have a town-level oil price; the DOER survey is statewide.

Your oil bill vs a heat pump: an estimate

Change anything. Every input has its source underneath, and every output is an estimate, not a quote.

Estimate from home sizeI know my gallons

Heated floor area (sq ft)

When was the home built?

Rule of thumb, not an official figure: about 0.5, 0.4 or 0.3 gallons per sq ft per year for older, mid and newer homes. Your delivery tickets are far better. Switch to “I know my gallons” and use those.

Oil price ($ per gallon)

Default: Massachusetts average retail heating oil, $6.08/gal on 09/28/26 (DOER survey, excludes cash discounts; the 10th to 90th percentile was $5.65 to $6.66). Source: Mass. DOER. Your dealer’s price will differ.

Who supplies your electricity?

Check your electric bill. Municipal light customers are not eligible for Mass Save heat pump rebates. Mass Save: air source heat pumps.

Electricity price (cents per kWh)

Default: Massachusetts average residential price, 30.49 cents, July 2026. Source: EIA Electric Power Monthly. Your bill is the better number.

Heat pump and system assumptions (all editable)

Efficiency of your current oil system (%)

Our assumption. Older boilers and furnaces are often 70 to 85 percent. The label on the unit or an assessor can tell you.

Heat pump seasonal efficiency (COP)

Our assumption. 2.5 means 2.5 units of heat per unit of electricity over a Massachusetts winter. Cold-climate units run higher in mild weather and lower in deep cold. Ask for a Manual J load calculation and the installer’s expected seasonal figure.

What are you replacing?

Share of heat the heat pump covers (%)

100% for a whole-home system. For partial-home, 50 to 70% is typical; ask your installer.

Heat use reduction from weatherization (%)

Default 0, to stay conservative. Mass Save says insulation and air sealing can lower heating and cooling costs by up to 15%. Source: Mass Save: home energy assessments.

Winter heat pump electric rate discount (cents per kWh)

Seasonal rates, Nov 1 to Apr 30, for homes heating with heat pumps, from the lower base distribution charge (and Eversource’s lower transmission charge). Auto-filled from the utility above: National Grid 4.24, Eversource 7.27, Unitil 6.54 cents. Set to 0 to ignore. The DPU is reviewing deeper discounts for winter 2026 to 2027, so this may change. Source: Mass.gov heat pump rates (we computed the differences).

Install cost and rebate

Heat pump size (tons)

Starts at about 1 ton per 500 sq ft. The real size comes from a heating load calculation. Rebates are paid per ton of cooling capacity (AHRI capacity divided by 12,000 Btu).

Installed cost ($)

Default: the $22,000 average whole-home installed cost in Mass Save’s own example (based on 2022 program data, so today’s quotes may differ). Get 2 to 3 quotes. Source: Mass Save: air source heat pumps.

Weatherization status (needed for the whole-home rebate)

Mass Save’s whole-home rule: built in 2000 or later, or an assessment recommends under $1,000 of weatherization, or recommendations from 2013 or later are completed. Otherwise you may be offered the lower partial-home amount. Source: Mass Save: air source heat pumps.

Estimate, not a quote

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Oil, per year-

Heat pump, per year-

Keep oilHeat pump (net cost + running)

Cumulative cost, prices held flat at today’s levels. Real prices will move.

Installed cost (your input)-

Mass Save rebate (est.)-

Net cost after rebate-

Simple payback-

Saving if oil falls to last winter’s $4.09-

Heat pump electricity-

Heat is converted at 138,500 Btu per gallon of heating oil and 3,412 Btu per kWh (EIA Btu conversions). Last winter’s $4.09 is DOER’s 2025/26 season average. The 0% HEAT Loan (up to $25,000, Mass Save: 0% financing) is not subtracted. Weather, usage and prices change, so actual results will differ.

Get matched with an installer that calls back

No installers are listed yet: we are first testing who actually answers the phone (how that works). Send your details and we will reply by email to say who we would match you with once the first installers pass the test. Independent guide; listed installers may pay to be listed.

Your name

Email

Phone (optional)

Street address or town

What heats your home now?

Home size

Timeline

What are you interested in?

Anything else? (optional)

I agree that Leaving Oil and participating Mass Save network installers or insulation contractors may contact me by email or by phone call (at the number I gave, if any) about my request. I understand Leaving Oil is an independent guide, that listed installers may pay to be listed, and that I do not have to agree in order to use the calculator or read this site. I can withdraw this consent at any time by replying to any message. See the privacy page.