What Does It Actually Cost to Heat Your Home?

Real fuel prices for Greater Portland, updated weekly from the Maine Governor's Energy Office. Enter your current heating setup to see how every system compares.

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What type of fuel is your primary heating system?

What type of system?

How old is your system?

How much do you spend on heating per year?

Annual spend $3,000

Do you have a second heating source?

Supplemental handles 20%

What would you upgrade to?

Your Current Cost

→

New System

Annual Savings

These are estimates based on regional fuel prices. Your free assessment will show you exactly what's possible for your home.

What if you also tightened up the house?

Estimated annual heating cost after insulation:

Savings assume minimal existing insulation. Your actual savings depend on current conditions.

Rebate Calculator

Estimate Your Rebate Savings

Select the upgrades you're considering and your income tier to see your estimated rebate.

Household Income Tier

No income verification needed. All Maine ratepayers qualify.

Select Your Upgrades & Adjust Cost

Attic Insulation & Air Sealing Full attic coverage with blown-in cellulose, plus air sealing of all penetrations $6,000 -$2,400

Project cost: $6,000

Wall Insulation Dense-pack cellulose blown into exterior wall cavities $4,000 -$0

Project cost: $4,000

Basement & Rim Joist Insulation Spray foam rim joist + basement wall insulation $3,500 -$0

Project cost: $3,500

Mitsubishi Heat Pump — Whole-Home Ducted System Must provide 100% of home's heating. Replaces existing furnace or boiler. $16,000 -$3,000

Mitsubishi Heat Pump — Single-Zone Wall Units Individual room comfort — living room, bedroom, or open-concept spaces $0 -$0

Number of heads: 2

Heat Pump Water Heater Replaces electric or oil-fired water heater $3,000 -$0

Installed cost: $3,000

Your Bottom Line

Here's what it all adds up to: what you'd invest, what Efficiency Maine pays back, and what you'd pay every month after rebates and financing.

Estimated Project Cost

$12,500

Your Rebate Savings

$2,800

You Pay

$9,700

Rebate deducted from your invoice upfront.

or finance for

$118/mo

10-year Efficiency Maine Green Bank loan at 7.99% APR

Get My Free Assessment

Estimate only. Actual rebate depends on project scope, costs, and Efficiency Maine program terms. We calculate your exact rebate at your free assessment.

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Get Real Numbers for Your Home

Free energy assessment, no obligation

Now Make It Real

You've seen what these upgrades look like for an average Greater Portland home. The next step is for us to come look at your house — measure the actual walls, the actual heating system, the actual ductwork — and turn the estimate into a specific number.

Exact project cost. Exact rebate amount. Exact monthly payment. Free, no obligation.

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About This Data

Fuel prices come from the Maine Governor's Energy Office weekly survey of fuel dealers across the state. We use prices for the Southeast / Greater Portland region.

The calculator adjusts efficiency based on your system type and age. For example, an ancient oil boiler runs at roughly 70% AFUE, while a newer one might hit 87%. Upgrade options use manufacturer-rated efficiencies: ductless heat pumps at COP 2.7, ducted at COP 2.3, and condensing boilers at 95% AFUE.

These represent typical installed performance, not lab ratings. Your actual efficiency depends on equipment condition and sizing.

View source data at maine.gov

What This Tool Doesn't Show

Exact equipment cost. Installation costs vary by home. The insulation and rebate sections in Part 2 give rough estimates, but a free energy assessment gives you exact numbers.
Your specific insulation levels. Part 2 estimates savings from insulation upgrades assuming minimal existing insulation. Your actual savings depend on current conditions.
Maintenance costs. Oil and propane systems require annual servicing. Heat pumps need filter cleaning and periodic professional maintenance.
The value of cooling. Heat pumps provide air conditioning. If you currently run window AC units, that cost isn't captured here.