Residential Energy Efficiency Rebates

Residential Energy Efficiency Rebates

The City of Naperville Electric Utility is offering rebates for homeowners who install energy-efficient attic insulation and windows.

  • To qualify for the rebate, applicants must be residential Naperville Electric Utility customers who own or rent their residence.
  • Improvements must be purchased and installed after March 18, 2020.
  • The rebates are limited to 50% of the project, including material and installation, with a $3,000 maximum rebate for each energy-efficient improvement.
  • Customers could qualify for a maximum rebate of $6,000 if they installed both attic insulation and energy-efficient windows.
  • Rebates will end when all funding is allocated.
  • Applicants must provide a copy of their current utility bill showing they are a contributor to the Renewable Energy Program at the $5 per month level or above. Renewable Energy Program contributions are the source of funding for these rebates. For more information and to sign up for the program, visit

Attic Insulation

For attic insulation, the final level of insulation (preexisting and new) must have a minimum R-Value of R49. A final depth of at least 15” is generally sufficient to reach the required R49 value.

Attic Insulation R-value of Materials and Depths: $1 per square foot/$3,000 maximum rebate


R-value per inch

R-value at 15”

Fiberglass (batt)



Fiberglass (blown)



Mineral Wool (batt)



Mineral Wool (blown)



Cellulose (blown)



For attic insulation, the final level of insulation (preexisting and new) must have a minimum R-Value of R49. 

Window Replacement

Windows must have a U-Factor of 0.30 or lower.

  • The grant amount is $300 per window with a $3,000 maximum award.
  • The window must separate a heated space from an unheated space and must replace a single-pane window with a double- or triple-pane window.

According to the Department of Energy, heat gain and heat loss through windows are responsible for 25% to 30% of residential heating and cooling energy use. For windows, the rate of heat loss is indicated in terms of the U-factor. The lower the U-factor, the greater a window’s resistance to heat flow and the better its insulating value.

For more information, please contact Bernie Saban at or (630) 420-6135.