N.H. Rev. Stat. § 326-F:14
No hearing aid shall be sold to any person unless accompanied by a 30-day written money back guarantee that if the person returns the hearing aid in the same condition, ordinary wear and tear excluded, as when purchased, within 30 days from the date of delivery, the hearing aid dealer or audiologist may be entitled to a cancellation fee of 5 percent of the purchase price. In computing the actual purchase price, all rebates, discounts, and other similar allowances provided to the seller shall be considered. For the purpose of this section, any consumer who initiates the return of a hearing aid within said 30-day period shall be in compliance with this section. The addressing of any claimed deficiency or return shall be resolved within 90 days from date of delivery.
RSA 326-F:14
2021, 91:183, eff. July 1, 2021.