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Duct Insulation and Sealing

50 percent of cost, up to $100

Upgrading your duct insulation and sealing can help control the comfort of your home and make sure that heated or cooled air isn’t escaping into your attic, crawlspace or walls, wasting energy and money. Testing, sealing and insulating your ductwork can help you save money by ensuring your heating system is only delivering heat where you need it.

Energy Trust offers duct sealing as a free service for residents of manufactured homes.

  1. Establish your eligibility.

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    You must live in Washington and heat your home with natural gas provided by NW Natural.

  2. Select a contractor and have the work completed.

    To receive an Energy Trust cash incentive, contact a qualified energy-efficiency-trained Energy Trust trade ally contractor or any registered Washington contractor with Performance Tested Comfort SystemsTM certification.

  3. Sign and submit your incentive application within 60 days of installation.

    Your contractor may help you complete the application form. Please allow six to eight weeks for incentive processing and payment.

    Download Incentive Application

    Send by Mail

    Energy Trust of Oregon
    818 SW 3rd Ave.,#215
    Portland, OR 97204

    Send by Fax


Energy Trust recommends sealing ductwork prior to insulating to maximize the effectiveness of insulation. There is no longer a standard Energy Trust incentive for duct sealing.


Duct insulation: 50 percent of cost, up to $100

To qualify for this incentive:

  • Ducts must be sealed before insulation is installed.
  • Existing insulation must be R-2 or less.
  • Duct insulation must be installed to R-11.

Encourage your contractor to read our Specifications Manual for our full duct insulation guidelines.

Incentives are subject to funding availability and may change.


Give us a call at 1.866.368.7878.