Home energy savings planner
Put in your state and what you use, then compare it with other ways of doing things: fewer hours, a more efficient appliance, another electricity plan or a heat pump. You get the monthly and yearly difference, the assumptions behind it, and a link to share.
2 Scenarios to compare
The first column is your home today. Change the appliances, hours, price or heating in the others. Everything you do not list stays the same in all of them.
3 Results
Where your money goes now (estimate)
| Everything else | $145/mo | $1,737/yr |
|---|---|---|
| Portable space heater | $33/mo | $397/yr |
Scenarios side by side
| Scenario | Per month | Per year | vs “Now” |
|---|---|---|---|
| Now 21.77¢ (as above) | $177.86 | $2,134 | – |
| 5 h a day 21.77¢ (as above) | $165.45 | $1,985 | −$12.42/mo · −$149/yr (−7.0%) |
How sure is this?
- 5 h a day: saves $149 a year at today's prices; saves $119–$179 if all prices are 20% lower or higher.
These are predicted differences, not guaranteed savings. They are only as good as the watts, hours and running shares entered: for most appliances those matter more than the price.
Assumptions
- Electricity: the Pennsylvania average for August 2026 (EIA), which includes fixed charges spread over every kWh; each scenario can use its own price.
- Everything else: your state's average (EIA, 817 kWh a month) monthly use minus the appliances listed in “Now”, the same in every scenario.
- Appliance schedules are what you entered; defaults are examples, not measurements.
- Monthly figures are yearly totals ÷ 12; real bills swing with the seasons.
Save or share
The link stores the state, kWh, prices, appliances and heating choice, not the bill amount. Nothing is saved on our server.
Example: running a space heater 5 hours a day instead of 8
In Texas, at the August 2026 average of 15.91¢ per kWh, a 1,500 W heater used 8 hours a day for a 5-month heating season costs about $290 a year. Cutting it to 5 hours saves about $109 a year ($22 in each month it is used). The planner opens with this example; change any number to match your home.
How the planner works
- Your home. The monthly kWh (from your bill, or your state's EIA average) is your whole household. The appliances and electric heating you list in the first scenario are part of it; the rest is "everything else" and stays the same in every scenario.
- Appliances. kWh a year = watts × hours a day × running share × days used ÷ 1,000, plus standby watts for the hours it is off. Cost = kWh × the scenario's price.
- Heating. Heat need starts from the typical gas-heated home in your state (EIA RECS 2020), scaled by floor area if you give it. Each system needs that heat divided by its efficiency (AFUE, or HSPF2 ÷ 3.412 for a heat pump), priced at your state's fuel price.
- Uncertainty. We show how each difference moves if every price is 20% lower or higher. The bigger uncertainty is usually your own hours and running shares.
Full formulas and sources: Data & methodology. Single-question tools: appliance cost · heating cost · bill checker.
What it does not do
It does not know your utility's exact tariff, tiers or demand charges, the weather in a given year, or installation prices. Savings shown are predictions under the inputs, not a guarantee. Nothing you type is sent to our server; a shared link carries only the energy parameters.