Insulation Savings Calculator
Estimate annual heating and cooling savings from upgrading home insulation based on R-value improvement.
年储蓄额
1,421 USD
Annual Savings vs Annual Heating & Cooling Cost
公式
## How to Calculate Insulation Savings Insulation reduces heat transfer, lowering the energy needed for heating and cooling. ### Formula **Efficiency Gain = 1 - (Current R-Value / New R-Value)** **Annual Savings = HVAC Cost * Efficiency Gain** ### Recommended R-Values (US) - Attic: R-38 to R-60 - Walls: R-13 to R-21 - Floors: R-25 to R-30 - Crawl space: R-25
计算示例
Upgrade attic insulation from R-11 to R-38 with $2,000/year HVAC costs and $2,500 upgrade cost.
- 01Efficiency gain: 1 - 11/38 = 1 - 0.289 = 71.1%
- 02Annual savings: $2,000 * 0.711 = $1,421
- 03Payback: $2,500 / $1,421 = 1.8 years
- 0410-year net savings: $1,421 * 10 - $2,500 = $11,710
常见问题
What is R-value?
R-value measures thermal resistance. Higher R-values mean better insulation. R-value is additive, so you can stack insulation layers to increase the total R-value.
Where should I add insulation first?
The attic is usually the most cost-effective location since heat rises. Air sealing before insulating is critical. Next priorities are walls, floors over unconditioned spaces, and crawl spaces.
What types of insulation are available?
Common types include fiberglass batts (R-3.1/inch), blown cellulose (R-3.5/inch), spray foam (R-6.5/inch for closed cell), and rigid foam boards (R-5/inch).