Estimate your savings
If you are interested in completing a custom project, use these calculators to estimate energy savings and payback
- Residential furnace savings calculator
- Condensing boiler calculator
- Destratification fan calculator
- Tank insulation calculator
- Stack economizer calculator
- Burner replacement calculator
Please note: Savings figures are estimates only and are in no way guaranteed by energySMART, a Nicor Gas program. Estimated savings serve solely as an example of the therm and dollar savings that may be achieved by upgrading to high efficiency. Actual savings will vary, and depend on other factors not considered in these calculations. Rebates are available to eligible Nicor Gas customers for the purchase and installation of qualifying equipment. Additional requirements apply.
**Always consult your contractors and/or engineers for additional project-specific analysis and expected outcomes on energy efficient improvements.