Manufactured homes duct sealing

Ensure the manufactured home qualifies:

• Must be an existing manufactured home; new construction is not eligible

Requirements for duct sealing:

• Work must be completed by a Wattsmart Vendor Network contractor. Find a program-qualified contractor in the Find A Vendor tool. Contractors must be on the list at the time of equipment installation
• Work completed must comply with all building codes and standards
• Must have a minimum of 10 linear feet of exposed duct work located in unconditioned space
• Home’s primary heating source must be either a ducted heat pump or an electric forced air furnace
• Existing ducts must be unsealed
• Duct sealing must be installed according to the specifications outlined in the Washington Technical Specifications Manual
• All physically accessible ducts located in unconditioned living space must be sealed
• A functioning carbon monoxide alarm is required when a combustion appliance is present within the confines of the structure

Information on free duct sealing direct install program:

• Duct sealing free direct install service is available through qualified program contractors on a limited basis
• Please contact the program at [email protected]  for more information and availability

Additional program requirements:

• Incentives are limited to one-time installations within the qualified space of the home and may not exceed the total cost of the project
• Homes that have previously received an incentive through the program do not qualify for additional incentives if replaced
• Incentive application and supporting documentation must be postmarked or submitted online within 90 days of equipment installation.

Required documents:

• Incentive Application, completed and signed *
• Itemized receipt or contractor invoice must include:
  • Date work initiated
  • Date work completed
  • Trade ally business name
• Third Party Payment Addendum (only for homeowners and other third-party entities not listed on account and applying for incentives)
• IRS W-9 Form, if applicable **
  * if mailing, please make copies for your records and note the date mailed on the application
  ** Applicable only to businesses and non-individual customers, including landlords, applying for incentives

Incentives are associated with the Home Energy Savings program January 1, 2022 tariff filing approved by the Washington Utilities and Transportation Commission. All incentives are subject to change with 45 days notice. Additional terms and conditions may apply.

Conditioned vs. unconditioned space – clarification notes:

For the most part, basements are conditioned spaces. Basements are not usually thermally isolated from the main living area and contain space conditioning ducts. Basements are also used for storage and frequently contain laundry facilities and other living spaces. Ducts serving unfinished basements are not always equipped with dedicated supply registers, although single registers at plenums are not unusual.

An unconditioned basement would have these properties: Thermally isolated from the main floor by insulation in the floor. Insulated, weather-stripped door (if above floor plane) and insulated stairwell walls where thermal plane penetrates floor, air sealed (caulked, foamed penetrations) wiring plumbing, sealed duct penetrations and sealed, insulated ducts. No supply registers.

While a crawlspace is unconditioned space, the floor must be insulated prior to or at the same time ducts are sealed and insulated to thermally isolate the crawlspace. Failure to do this will increase the heating load of the home and potentially cause comfort issues.