Order may be cancelled for a full refund at any time within 7 days. Once installed, order cannot be cancelled or returned. In the event of a manufacturer defect under the warranty period, a Bright Light Air certified technicians will test and verify unit performance. Bright Light Air will replace any malfunctioning unit free of charge caused by manufacturer defect. For questions, please email [email protected] or call us at at 833-44-BREATHE (833-442-7328).