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Both calculators run independently — change the inputs on either side to compare results.

Home Energy Efficiency Upgrade Calculator

Calculate the payback period in years for home energy upgrades — insulation, new windows, or a new HVAC system — based on your home size, current energy bill, climate zone, and available rebates.

Home Size (sq ft)

Current Monthly Energy Bill ($)

Upgrade Type

Climate Zone

Available Rebates (%)

Fill in the required fields to see your result.

Climate

Renewable Energy Investment ROI Calculator

Estimate the 25-year return on investment for solar, wind, or geothermal installations. Use it when comparing system sizes, incentive packages, or electricity rate scenarios before committing to a renewable energy project.

System Capacity (kW)

Total Installation Cost ($)

Tax Credits & Rebates ($)

Current Electricity Rate ($/kWh)

Annual Rate Increase (%)

Fill in the required fields to see your result.

Key differences

	Home Energy Efficiency Upgrade Calculator	Renewable Energy Investment ROI Calculator
Category	Climate	Climate
Inputs required	5	5
Result	Annual Net Savings After 15 Years ($)	25-Year ROI Percentage (%)
What it does	Calculate the payback period in years for home energy upgrades — insulation, new windows, or a new HVAC system — based on your home size, current energy bill, climate zone, and available rebates.	Estimate the 25-year return on investment for solar, wind, or geothermal installations. Use it when comparing system sizes, incentive packages, or electricity rate scenarios before committing to a renewable energy project.