The contractors listed below have requested to be included in a list of firms providing airtightness testing services for houses and/or duct systems. Many of these contractors also provide air leakage repair services. To access the contractor list, click on the State (or Province) of your choice and click on the "Submit Search" button. The Energy Conservatory makes no representations concerning the work performed by any of the listed contractors, and assumes no risk for their work performance, professional advice or services rendered. Contractors can be removed from the list at any time at the sole discretion of The Energy Conservatory.