If you’re planning a build, comparing floor plans, or just trying to make sense of a utility bill that keeps climbing, one question keeps coming up: what will this house actually cost to run every month? It’s a harder question to answer than it looks. The same 2,000-square-foot home can cost $90 a month to power in North Dakota and well over $300 in Hawaii or Connecticut. Swap a gas furnace for a heat pump and the number moves again. Add solar and the math changes a third time — especially now that the rules around solar incentives have shifted in 2026.

This guide walks through where a home energy bill actually comes from, what’s changed recently, and how to use our free Home Energy Cost Calculator to get a number that’s specific to your home instead of a national average that may not apply to you at all.

01What is a home energy cost calculator?

A home energy cost calculator is a planning tool that estimates your monthly and annual utility bill from a handful of inputs — your square footage, occupants, climate, and how the home is heated — instead of relying on a flat national average. Our free Home Energy Cost Calculator goes a step further: it also compares heating types side by side and models a real 2026 solar payback period, so you can make an equipment decision with actual numbers instead of a guess.

02Why a national average won’t tell you much

Energy sites love to quote “the average American electric bill.” As of early 2026, that average sits around $150–$165 per month, based on roughly 869 kWh of monthly usage at the national average rate. That figure comes from the U.S. Energy Information Administration, and it’s a reasonable starting point — but it’s also close to meaningless for any specific house.

Rate is only half the equation. The other half is usage — and usage is driven almost entirely by three things:

• Square footage. More conditioned space means more heating, cooling, and baseline electrical load.
• Climate zone. A “mixed” climate home might run its HVAC system a few months a year; a home in a cold or hot zone can run it nearly year-round.
• How the home is heated. Natural gas, propane, electric resistance, and heat pumps all convert energy into heat at very different efficiencies and very different costs per unit.

Change any one of those three variables and the monthly number can shift by $50–$150. That’s the entire reason we built a Home Energy Cost Calculator instead of just publishing another “average bill” chart.

03What’s actually in your bill

A typical residential energy bill is really three costs stacked together:

Baseline electric load — refrigeration, lighting, laundry, electronics, and general plug load. This runs 24/7 regardless of season and scales gently with home size and household size.

Heating and cooling — usually the single largest swing factor in the bill, and the one most tied to climate and equipment choice.

Water heating and miscellaneous appliances — smaller than the first two, but not negligible, especially in larger households.

Natural gas remains the most common heating fuel in the U.S. and, per household, one of the cheaper ways to generate heat. The national average residential price is roughly $1.45 per therm as of early 2026, according to EIA Natural Gas Monthly data — though that varies from around $0.80/therm in gas-rich states like Wyoming to over $5/therm in Hawaii.

Propane, common in rural areas and many new-build barndominiums that sit off the natural gas grid, is typically the most expensive way to heat a home per unit of delivered heat. If you’re comparing a barndominium build with propane against one with gas-line access, that difference alone can be worth budgeting around — which is part of why the Home Energy Cost Calculator treats propane as its own option rather than lumping it in with gas.

04Gas furnace vs. heat pump vs. electric resistance

This is where most “average bill” articles stop short, because heating equipment is the single biggest lever a homeowner or builder actually controls.

• Electric resistance heat (baseboard heaters, older forced-air electric furnaces) converts electricity to heat at roughly 1:1 efficiency. Simple and cheap to install, but in most climates the most expensive to run long-term.
• Natural gas or propane furnaces burn fuel on-site. Efficient modern units recover 90%+ of the fuel’s energy as heat, and where gas is cheap, this often beats electric resistance on monthly cost.
• Heat pumps don’t generate heat so much as move it, extracting warmth from outside air (or ground, for geothermal systems) and concentrating it indoors.

None of these is a universal “best” choice — it depends on your local electricity rate, your local gas rate, and your climate zone. That’s exactly the comparison the Home Energy Cost Calculator’s heating-type bar chart is built to show side by side, using your actual local rates instead of a generic assumption.

05Solar in 2026: the math just changed

If you’ve read anything about solar payback periods that’s more than a year old, it’s probably now inaccurate — and not in solar’s favor.

For over a decade, the federal government offered a 30% tax credit (Section 25D, the Residential Clean Energy Credit) on the cost of a home solar installation. Under the original 2022 schedule, that credit was set to run at 30% through 2032 before slowly stepping down. That changed with the One Big Beautiful Bill Act, signed into law on July 4, 2025, which moved up the expiration date dramatically.

In plain terms: if you install solar in 2026 or later and pay for it yourself (cash or loan), there is currently no federal tax credit to subtract from the cost. Homeowners who finished installation in 2025 can still claim the credit on that year’s return, but new 2026 buyers are pricing solar without that 30% cushion. State-level incentives, utility rebates, and net metering programs still exist in many areas and are worth checking — but the federal baseline has genuinely shifted.

That makes the raw hardware economics matter more than ever. As of 2026, installed solar costs average around $2.50–$3.50 per watt before any incentive, with most homeowners landing near $2.80/watt, based on aggregated pricing data from EnergySage. For a typical 6 kW residential system, that puts the pre-incentive price in the $15,000–$21,000 range.

This is exactly why the Home Energy Cost Calculator’s solar section lets you set your own cost-per-watt and incentive percentage instead of hard-coding an outdated 30% assumption — you can zero out the federal incentive field to model a 2026-and-later install accurately, or enter whatever your state currently offers.

06How to use the Home Energy Cost Calculator

The calculator on this page is built to answer one question honestly: based on my home, my climate, and my local rates — not a national average — what will I actually pay?

• Home inputs — square footage, occupants, and climate zone (cold, mixed, or hot) set your baseline usage and heating/cooling load.
• Heating and rates — pick your primary heating fuel (gas, propane, heat pump, or electric resistance) and enter your actual local electricity and fuel rates, straight off a recent utility bill.
• Live readout — the gauge and digital total update instantly as you adjust anything, broken into an electricity line and a heating-fuel line so you can see where the cost is coming from.
• Heating comparison bars — regardless of what you’ve selected, the tool shows what your same home would cost under all four heating types, so you can see the real dollar gap before you commit to equipment.
• Solar toggle — add a system size, your quoted cost per watt, and any incentive percentage you’re eligible for. The tool estimates net system cost, monthly savings, payback period, and a 10-year cumulative cost comparison.

Every number is a planning estimate, not a substitute for an actual utility rate schedule or a signed solar quote — but it’s built from real usage patterns and current market pricing rather than a single flat “average American home” number.

07A quick example

Take a 2,400 sq ft home in a mixed climate with three occupants, electricity at 18¢/kWh (close to the current national average), and a $1.45/therm gas rate:

• With a gas furnace, the estimated monthly energy cost lands in the low-to-mid $100s.
• Switching that same home to a heat pump typically narrows or even closes the gap with gas, depending on the local electricity rate — sometimes coming out cheaper once you factor out a separate gas hookup fee.
• Electric resistance heat is usually the most expensive of the four options in this scenario.
• Adding a 6 kW solar system at today’s ~$2.80/watt pricing, with no federal credit applied, generally lands the payback period in the low-to-mid double digits (years) — noticeably longer than the 6-to-9-year paybacks often quoted in older articles written before the federal credit expired.

Your own numbers will differ based on your rates and climate — which is exactly the point of running your specific home through the Home Energy Cost Calculator rather than relying on an example.

08A few ways to lower the number, regardless of equipment

• Air-seal and insulate before upsizing equipment. A tighter envelope often has a bigger impact on the bill than swapping a furnace. ENERGY STAR’s home improvement guidance is a solid starting point.
• Get a home energy audit before finalizing HVAC choices on a new build — it’s far cheaper to size equipment correctly upfront than to retrofit later. If you’re weighing an HVAC or insulation upgrade on an existing house instead, the Home Renovation Cost Calculator prices that alongside every other room and project.
• Model heat pump vs. gas with your real rates, not a rule of thumb — the breakeven point genuinely moves depending on your state.
• If you’re weighing solar, run the payback math with the current $0 federal credit assumption, then layer in only the state or utility incentives you’ve actually confirmed you qualify for.

09Frequently asked questions

—Related calculators

The Home Energy Cost Calculator above covers utilities — these tools cover the rest of the build: