Home Energy Audit Calculator
Estimate your home's annual energy costs, get an efficiency score, and discover the top upgrades to save money on heating, cooling, and electricity.
Reviewed May 25, 2026. JouleIO calculators are planning tools; confirm final utility rates, equipment specs, incentives, installation bids, and safety decisions with official utility, manufacturer, installer, DOE, ENERGY STAR, EPA, IRS, or EIA sources.
1. Enter real usage
Use your actual watts, runtime, home size, miles, battery size, or appliance schedule.
2. Localize the rate
Compare national assumptions with your state, utility bill, time-of-use plan, or project quote.
3. Verify before acting
Check final prices, rebates, tax rules, and safety requirements before buying or installing equipment.
Total conditioned living area
Approximate year of construction
Attic and wall insulation condition
Primary window glazing type
Primary heating and cooling system
People living in the home
Audit Baseline & Source Check
Reviewed May 21, 2026This calculator is a planning estimate, not a replacement for a professional blower-door or thermal-imaging audit. Use your utility bill for the most accurate local cost, then use the result to prioritize which improvements deserve a contractor quote.
Frequently Asked Questions
How accurate is this home energy audit calculator?
This calculator provides a solid estimate based on national averages and your home characteristics. For a precise assessment, hire a certified energy auditor who will use specialized equipment like blower door tests and thermal imaging.
What is a good home energy efficiency score?
A score of 80-100 indicates an efficient home with modern insulation, windows, and HVAC. Scores of 60-79 are average, and below 60 suggests significant room for improvement through upgrades.
What is the single biggest way to reduce home energy costs?
For most homes, upgrading to a heat pump provides the largest savings (20-30% reduction). The second biggest impact is improving insulation and sealing air leaks, especially in homes built before 2000.