Services: At Hart Hearing Centers we carry the world’s most reputable digital hearing aids; most are state-of-the-art technology. Every hearing aid we dispense carries a 45-day risk free trial period. Hart Hearing Centers Refund Policy: Hearing aids are sold on a 45-day trial basis. Payment is due at the time of the fitting. Our goal at Hart Hearing Centers is to make sure you wear and get benefit from the hearing aids you purchase. If at the end of the trial period you feel that is not the case, you can return the hearing aids and receive a full refund. (There is a small charge for custom earmolds, which are not returnable.)