Household & Family

Home Energy Savings Calculator

Find the swaps that actually shrink your monthly utility bill.

The cheapest watt is the one you do not use. Most homes can cut energy bills 20-40% with upgrades that pay for themselves in under 5 years — LED bulbs, smart thermostats, attic insulation, sealed ductwork. This calculator shows the annual savings and payback period for each upgrade so you can prioritize.

Your home and habits

$

Upgrades to evaluate

Total annual savings
$0 /yr

Select upgrades to see your annual savings and payback period.

Note: All calculations run in your browser. Nothing is sent to a server, stored, or tracked.

How this calculator works

The math, in plain English

We use Department of Energy savings estimates adjusted for your climate, home size, and age. The percentages below are typical savings on a typical $180/month ($2,160/year) energy bill.

Upgrade economics

LED bulbs: 5-10% savings. Cost: $50-150 for whole home. Payback: 6-12 months. The lowest-hanging fruit — every home should do this.

Smart thermostat: 8-15% savings (more in extreme climates). Cost: $100-250. Payback: 9-18 months. Best for homes with regular schedules; less benefit if someone is always home.

Attic insulation (R-30 to R-49): 10-20% savings in cold/mixed climates. Cost: $1,200-2,400. Payback: 3-7 years. Most cost-effective major upgrade for older homes.

Air sealing: 5-15% savings. Cost: $300-1,000 (DIY to professional). Payback: 1-4 years. Often paired with insulation.

Energy Star appliances: 5-10% savings when replacing 10+ year old units. Cost: variable. Payback: 5-10 years. Replace when old units fail; do not replace working appliances.

Heat pump HVAC: 20-40% savings vs oil/gas furnaces. Cost: $5,000-15,000 after rebates. Payback: 5-12 years. Also eliminates gas line — full electrification.

Rooftop solar: 50-100% savings on electric (not gas). Cost: $15,000-30,000 before 30% federal tax credit. Payback: 6-12 years. Best in sunny climates with high electric rates.

A worked example
$180/month bill, mixed climate, 30-year-old 1,800 sqft home. Upgrades: LED ($120, saves $180/yr), smart thermostat ($200, saves $252/yr), attic insulation ($1,800, saves $324/yr), air sealing ($600, saves $216/yr). Total cost: $2,720. Annual savings: $972. Payback: 2.8 years. 10-year savings: $9,720.

The Inflation Reduction Act rebates

The 2022 IRA added substantial rebates for energy upgrades: up to $1,600 for insulation/sealing, $2,000 for heat pumps, $8,000 for whole-home electrification for low-income households. Stack these with the 30% federal solar tax credit. State and utility rebates add more — check dsireusa.org for your state.

FAQ

Common questions

Which upgrade should I do first?
Almost always LED bulbs and a smart thermostat — they have the fastest payback (under 18 months) and are easy DIY. Next, get a professional energy audit ($100-500, often free from your utility) to identify your home's specific leaks. Then attic insulation and air sealing, which have 3-7 year payback. Heat pumps and solar are bigger investments — do them after the cheap stuff.
Does a smart thermostat really save money?
Yes — 8-15% on heating and cooling, according to Energy Star. The savings come from automatic setback (lower heat when you sleep or leave) that you would otherwise have to remember. If you already have a programmable thermostat and use it diligently, the upgrade savings are smaller. If you have a basic mercury thermostat, the upgrade is huge.
Is solar worth it in my state?
It depends on three factors: (1) local electricity rate (above $0.15/kWh makes solar more attractive), (2) sunlight (southwest U.S. gets 30% more production than northeast), (3) net metering policy (some states pay full retail rate for excess solar; others pay wholesale). Use PVWatts.gov to estimate production for your address, then check your state's net metering rules on dsireusa.org.
Should I replace working appliances for efficiency?
Usually no. A 15-year-old refrigerator uses about $50-80/year more than a new Energy Star model, but replacing it costs $800-1,200. Payback is 10-15 years. Replace when the old unit fails or needs expensive repair — not before. Exception: very old second refrigerators in unconditioned garages can cost $200+/year to run; retire them.
How do I find a good contractor?
Look for BPI-certified (Building Performance Institute) contractors for insulation and air sealing. For heat pumps, look for NATE-certified HVAC contractors with heat pump experience. Get 3 quotes; reject any contractor who does not do a load calculation (Manual J). Your utility may have a preferred contractor list with quality vetting.
Read next

The article behind this calculator

Travel Hacking With Frequent Flyer Miles: A Beginner's Field Guide

Cents-per-mile, sweet-spot redemptions, and the award charts worth memorizing.

Read article
Try next

Related calculators

Multi-Generational Household Expense Splitter Split bills fairly across earners of different incomes under one roof. Home Inventory Replacement Value Calculator Walk room-by-room and total what it would really cost to replace everything. Renters Insurance Coverage Calculator Right-size your personal property and liability coverage in minutes. Home Energy Savings Calculator Find the swaps that actually shrink your monthly utility bill.

Disclaimer: This calculator is provided for educational and informational purposes only. It does not constitute financial, tax, legal, medical, or professional advice. Results depend on the accuracy of the inputs you provide and the assumptions documented above. Always consult a qualified professional before making decisions based on these calculations.