Loading the page...
Preparing tools and content for you. This usually takes a second.
Preparing tools and content for you. This usually takes a second.
Fetching calculator categories and tools for this section.
Free home weatherization savings calculator for annual heating and cooling spend, an expected percent reduction after air sealing and insulation, and optional project cost for simple payback. Use it alongside efficiency and utility tools to screen savings before detailed modeling.
Last updated: April 18, 2026
Need a rebate or program calculator for contractors? Get a Quote
Use the portion of your utility bills tied to space conditioning, or an auditor’s estimate.
Typical screening range ~10–25% for air seal + attic; comprehensive packages can be higher.
Enter contractor bid or program cost for simple payback years.
Annual savings
$432
$36.00 / month
HVAC cost after (annual)
$1,968
Simple payback
15 years
Project cost ÷ annual savings (no discounting).
5-year cumulative savings
$2,160
10-year cumulative savings
$4,320
Planning note
Often first
Attic floor, rim, penetrations
Pair with controlled ventilation where required for safety and moisture.
Thermal barrier
Higher R-value, fewer losses
Climate-specific codes and best practices vary by zone.
Higher cost per point
Bundle with air seal
Savings depend on existing condition and solar gain.
Delivery efficiency
Less lost air in attics
Can be folded into your HVAC cost reduction percent if measured.
Quality
Avoid condensation damage
Dollar model here is energy-only; durability has separate value.
Net cost
Adjust payback inputs
Enter out-of-pocket project cost after incentives for payback.
$2,400/yr HVAC baseline, 18% reduction, $6,500 project:
Annual savings
$432
Simple payback
15 yrs
10-yr cumulative
$4,320
Annual savings equal your baseline annual heating and cooling cost multiplied by the expected fractional reduction in that energy use after weatherization. Remaining annual cost is baseline minus savings. If you provide a total project cost, simple payback equals cost divided by first-year savings. Cumulative 5- and 10-year savings assume the same annual savings each year—an approximation, not a present value.
annual_savings = baseline_HVAC_cost × (percent_reduction / 100)cost_after = baseline − annual_savingspayback_years = project_cost / annual_savingsPercent reduction should reflect the combined effect of your planned measures on HVAC energy.
Tighter envelope, less wind-driven leakage and stack effect loss
Compare insulation payback logic in our home insulation payback calculator.
Get a custom calculator for your platformShare it with homeowners and retrofit programs
Suggested hashtags: #Weatherization #EnergyEfficiency #Home #Savings #Calculator