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Heat Pump Payback & ROI Calculator from 12 Months of Bills

Enter a year of heating bills and monthly average temperatures. The tool runs a heating-degree-day regression on your actual usage, models a proposed heat pump with a temperature-dependent COP curve, and reports estimated annual savings, simple payback, and NPV for the upgrade.

An upgrade-economics estimator for the question "will a heat pump pay for itself" built on your own billing history rather than national averages. Fill in the 12-month billing table with your fuel type (propane, natural gas, fuel oil, or electric), monthly usage in native units, monthly cost, and the average outdoor temperature for each month; summer rows can be marked as baseload so non-heating use (water heating, cooking) is estimated and separated by the regression rather than counted as heating. The tool computes heating degree days from your entered temperatures, runs a linear regression of delivered BTU against HDD to characterize how your home actually responds to weather, and derives your current cost per delivered BTU. You then describe the proposed system: installed cost, rebates or incentives, electric rate, rated capacity at 47 F and 5 F, and a piecewise COP curve. The model re-prices each month of your historical heating load through the heat pump and reports estimated annual savings, simple payback period, and net present value at your chosen discount rate, with KPI tiles and month-by-month comparison charts. All outputs are estimates from your bills and assumptions: constant prices, your entered temperatures rather than official station weather, and no modeling of fuel escalation, maintenance, or financing.

Pro Tip: Mark your summer months as baseload rows before reading the results. On a shared gas or propane account, water heating can be 15 to 30 percent of annual fuel, and if the regression counts it as space heating the projected savings (and the payback case) come out rosier than reality. Then stress-test the verdict: re-run with electricity 20 percent higher and fuel 20 percent lower; a project that only pencils under favorable prices is a different decision than one that survives the swing.

Estimate your design-day BTU/hr load from the same bills before sizing the heat pump

Heat Load from Bills Calculator →

Find the outdoor temperature where backup fuel beats the heat pump you are pricing

Mini-Split Efficiency & Cost Calculator →

Run cost per BTU and other quick checks on the systems being compared

HVAC System Analyzer →

Run the same payback logic on a heat pump water heater

Heat Pump Water Heater ROI Calculator →

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Heating Bill ROI Calculator
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How It Works

  1. Fill In the Billing Table

    Enter 12 months of bills: fuel type, usage in native units (gallons, therms, m3, GJ, or kWh), dollar cost, and the average outdoor temperature for each month. The table pre-labels the last 12 months; pull average temperatures from your bills or a weather-history site.

  2. Mark Baseload Months

    Check the baseload box on summer months where the fuel use was not space heating. The regression uses those rows to estimate a non-heating intercept so water heating and cooking are not counted as savings potential.

  3. Set Up the Current System

    Enter the efficiency of your existing equipment (AFUE for combustion, or COP for existing electric heat) and the HDD base temperature (65 F is the conventional default). The tool computes HDD per month, regresses delivered BTU against HDD, and shows your home heating slope and current cost per delivered BTU.

  4. Describe the Proposed Heat Pump

    Enter installed cost, any rebate or incentive, your electric rate, the rated capacity at 47 F and 5 F, the COP curve points, and your discount rate. These come straight off the equipment submittal and the quote.

  5. Read the Verdict

    KPI tiles show estimated annual savings, simple payback in years, and NPV over the analysis horizon. The charts compare current versus projected monthly cost so you can see which months carry the savings and where backup heat would still run.

  6. Share or Export

    Share links encode the entire billing table and proposal for a second opinion, and PDF export produces a report with inputs, regression results, and the savings analysis.

Built For

  • A propane-heated homeowner with a $14,000 cold-climate heat pump quote checking whether the projected savings justify the spend
  • Comparing two quotes with different equipment by swapping capacity and COP inputs and watching payback and NPV move
  • Checking how much of the heat pump case survives if electric rates rise 20 percent, by re-running with adjusted prices
  • An energy auditor producing a quick bills-based savings estimate for a client before recommending a full assessment
  • A homeowner with electric resistance baseboard estimating savings from a mini-split conversion, where paybacks are typically shortest

Features & Capabilities

HDD Regression on Your Actual Bills

Instead of assuming a typical home, the tool regresses your delivered BTU against heating degree days computed from your entered monthly temperatures, so the savings model reflects how your specific building responds to cold weather.

Baseload Separation

Months you mark as baseload anchor a regression intercept for non-heating fuel use, preventing water heating and cooking from being silently counted as space-heating savings.

Temperature-Dependent Heat Pump Model

The proposed system uses rated capacity at 47 F and 5 F with a piecewise COP curve, so cold months are priced at cold-weather efficiency instead of a single fixed COP, which is the mistake that makes most online heat pump savings claims optimistic.

Three Verdict Metrics

Estimated annual savings in dollars, simple payback period on the net installed cost after rebates, and NPV at your discount rate, because a 9-year payback reads differently at 2 percent and 8 percent discount rates.

Multi-Fuel and Multi-Unit Input

Propane, natural gas (therms, cubic meters, or GJ), fuel oil, and electric, each converted with standard heat contents, so US and Canadian bills both work.

Month-by-Month Comparison Charts

Current versus projected cost charted by month shows where the savings live and which months a backup fuel would still carry load.

Share Links and PDF Export

The full billing table and proposal encode into a share URL, and the PDF report packages inputs, regression results, and the savings verdict for the project file.

References

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Frequently Asked Questions

It depends on what you pay for the fuel you are leaving, what you pay for electricity, your climate, and the installed cost after incentives. The strongest cases are typically homes on propane, oil, or electric resistance heat; natural gas at low prices is the hardest fuel to beat. This calculator answers the question with your own 12 months of bills instead of a national average, and reports payback and NPV as estimates you can stress-test.
It is an estimate, but a well-grounded one: the HDD regression captures how your actual building used fuel across a real year of weather. The main error sources are the monthly average temperatures you enter (official station data may differ), baseload that was not marked, future price changes, and the difference between rated and installed heat pump performance. Treat the output as a planning figure with realistic error bars, not a guarantee.
Heating degree days (HDD) measure how cold a month was: for each day, the degrees the average temperature fell below a base (conventionally 65 F), summed over the month. Plotting delivered BTU against HDD for your 12 bills gives a nearly straight line for most homes; the slope is your fuel use per degree-day of cold, and the intercept approximates non-heating baseload. That slope is what lets the tool re-price your heating under a different system.
Published estimates commonly run anywhere from about 3 years (replacing electric resistance or expensive propane, with good incentives) to well over 15 years (replacing cheap natural gas at full installed cost). The range is so wide that a typical figure is nearly useless, which is why this tool computes yours from your own bills, your quote, and your local rates.
Heat pump output falls as outdoor temperature drops, and the two rating points let the model interpolate capacity in cold months. A unit rated 36,000 BTU/hr at 47 F may deliver far less at 5 F; ignoring that overstates winter savings and hides backup-heat hours. Both numbers are on the manufacturer submittal or the NEEP cold-climate listing.
Look at both. Simple payback is intuitive (years until the savings repay the net cost) but ignores the time value of money and everything after the payback year. NPV discounts each year of savings at your chosen rate and sums them against the cost; a positive NPV means the project beats your discount rate. A long-payback project can still have solidly positive NPV over the equipment life, and vice versa.
No. Savings are computed at the constant prices you enter, with no escalation, degradation, maintenance, or loan modeling, and the only incentive is the rebate field. That keeps the inputs honest and checkable; if you want to test escalation, re-run with adjusted prices and compare.
Disclaimer: This is a financial planning estimate built from the bills, temperatures, prices, and equipment ratings you enter, not an energy audit, an engineering analysis, or a guarantee of savings. Heating degree days are approximated from your entered monthly average temperatures, baseload separation depends on the rows you mark, and the model holds prices constant with no escalation, maintenance, degradation, or financing effects. Verify equipment selection and sizing with a qualified HVAC contractor and confirm incentives with the issuing program before committing to a purchase.

Learn More

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