How to use the Home Insulation Savings Calculator
The Formula
Composite U-value from wall insulation and window type drives estimated annual HVAC kWh for your climate. The upgrade scenario targets advanced insulation plus Low-E glazing—typical deep retrofit targets.
Practical Example
Lower U means less heat loss and gain. Moving from standard walls to high-performance insulation often cuts HVAC energy 20–30% when paired with better glazing. Results are planning estimates—air sealing and HVAC efficiency also matter.
About Home Insulation Savings Calculator
What we model
Composite U-value from wall insulation and window type drives estimated annual HVAC kWh for your climate. The upgrade scenario targets advanced insulation plus Low-E glazing—typical deep retrofit targets.
U-value and savings
Lower U means less heat loss and gain. Moving from standard walls to high-performance insulation often cuts HVAC energy 20–30% when paired with better glazing. Results are planning estimates—air sealing and HVAC efficiency also matter.
Frequently asked questions
Q: Gas heat? A: Savings scale similarly in BTU terms—enter your blended $/kWh equivalent. Q: Only walls? A: Window type is included; attic work adds savings beyond this model. Q: Climate default? A: We suggest a zone from browser location when permitted.