Please Enter the Information Based on Your Home

System Efficiency:

Please Select A Method of Heating

Natural Gas


Load Factors:

C-factor reflects seasonal heat gains to the home combined with thermal storage by the building materials. These gains come in multiple forms, including solar gains as well as internal gains from such sources as lighting, appliance heat, and occupants. The C-factor should be greater in colder climates, and in homes that are more energy efficient than typical.

Fuel Costs of

Estimated annual percentage increase in residential fuel costs

Statewide residential fuel cost average based on EIA, last updated

Use "Submit" to update the calculation for the fields above. If you make changes in Advanced Options (below) update the calculation using the "Update Options" button near the bottom of this page.

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Disclaimer This calculator is based on ACCA Manual J v8.0. Actual costs and savings will vary depending on weather conditions, usage and construction details. This information is intended as an example for comparison purposes only. Your actual cost and savings will vary.


5 Year Savings

10 Year Savings

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