Dual Fuel Calculator

Estimate the split between electricity and gas in a mixed-fuel home.

Use this page when your household uses both fuels and you need a directional breakdown before deciding whether the real problem is cooling, heating, water heating, or the combined bill structure.

If one fuel clearly dominates, switch to the electricity calculator or the gas calculator instead.

Electricity Gas Dual Fuel

Last updated April 7, 2026

Source direction U.S. residential electricity and heating patterns

Best use Find which fuel deserves attention first

Tool Notes

Built for mixed-fuel homes, not exact total-bill reconstruction.

The dual-fuel calculator works best for households that use electricity plus gas and need a practical split before chasing the wrong problem. It shows a combined range, but it is more useful for finding the bigger driver than for matching a statement exactly.

What it uses

ZIP code as a regional proxy, square footage, occupancy, heating setup, water-heating fuel, cooking fuel, and cooling load.

What it does not use

No utility account data, no delivery riders, no taxes, no exact tariffs, and no plan matching.

When it helps most

Use it when you are trying to decide whether the household behaves more like an electric-heavy home, a gas-heavy home, or a genuinely split-fuel home.

Dual-fuel result

$228/month

Typical combined range: $196 to $267

Homes like yours may be able to lower that by $25 to $55/month.

Electric share

Gas share

Best focus Whole-home runtime and leakage

Likely issue

One side of the bill is probably dominating, and the first job is to identify which fuel deserves attention first.

Do this first

Check which fuel carries the larger share, then pressure-test that side against the real statement before changing anything else.

Do not do this yet

Do not treat the combined total as a precise reconstruction or buy fixes for both fuels at once.

The combined number is mainly a routing tool: it helps you choose the next narrower check, not settle every line item.

Suggested next move

Air sealing and thermostat control

When both fuels matter, start with envelope losses and heating schedules before chasing smaller devices.

View next step

Treat this as a first-pass route, not proof that one product category solves both sides of the bill. Confirm which fuel is dominant before acting.

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Shareable Report

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Fuel Split

See each side of the bill before adding them together.

Estimated electricity side

$126/month

Estimated gas side

$102/month

What to do next

Check which fuel is carrying more of the total, then pressure-test that side of the bill first with your actual statement.

If one side clearly dominates

Move to the single-fuel calculator that matches the bigger driver so the next estimate is narrower and easier to challenge against the real bill.

When this tool is wrong

It can mislead when one fuel has unusual tariffs, backup heat changes the pattern, water heating dominates unexpectedly, or the household has major seasonal or equipment-specific behavior that the simple split does not capture.

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