Cascade Home » Energy Efficiency » Residential Rebate Offerings » Residential Window/Glazing Rebate Program

CNG offers two (2) Residential window rebates for replacement of single pane windows and single pane patio doors.

Please note:  If you are replacing Existing Double Pane Windows, you are not Qualified to receive a Rebate

  1. 0.22 U-Factor $9.00 per square foot
  2. 0.30 U-Factor $5.00 per square foot


  • Must be a current CNG residential customer, Schedule 503
  • You must use CNG natural gas as the primary source of your home heating
  • Windows must carry certification and label from the National Fenestration Rating Council (NFRC)
  • Windows must be installed within the conditioned living areas of the home at the time of installation
    • Garages, unconditioned basements, etc. are not eligible
  • These window rebates do not apply to New Construction
  • Rebate amount is determined by the square footage of the glazing installed


  • You must attach the required documents as specified on the application:
    • Final Installation Invoice from the Washington State Licensed Contractor that installed them
    • Manufacturer Packing Slip listing each Window U-Factor with Dimension/Measurement