N.H. Rev. Stat. Ann. § 153-A:31

Any person who, in good faith and without compensation, renders emergency care by the use of an automated external defibrillator shall not be liable for civil damages for any acts or omissions unless the acts or omissions were grossly negligent or willful and wanton. Any person, association, corporation or other organization that acquires and maintains an automated external defibrillator for emergency care shall not be liable for civil damages other than for gross negligence or willful and wanton acts or omissions. This section shall not limit civil liability protection provided by any other law.