Completing the annual maintenance on a 2006 Bryant heat pump. All electrical, mechanical and safety components of the system check out at this time. During testing of the unit the technician found no electrical protection device for the outdoor unit and no water detection device for the indoor unit. Customer declined at this time. Technician recommended customer replace air filter monthly, as the one replaced was very dirty. Customer was under assumption the filters were replaced every three months. No issues at time of departure.