Performed semiannual maintenance on one heat pump heating system. Inspected all Performance, Mechanical and Safety systems. Changed out one AprilAire 210 filter that the homeowner provided. Also cleaned and cleared the primary drain line that ties into the downstairs hall bath sink. Added a new fresh layer of JS insecticide at the outdoor unit to help deter ants from getting inside the outdoor unit and damaging electrical components. Verified everything was operating within manufacture specifications for operation. Everything is working at this time. Also cleaned and cleared the primary drain line that ties into the downstairs hall bath sink. Added a new fresh layer of JS insecticide at the outdoor unit to help deter ants from getting inside the outdoor unit and damaging electrical components. Verified everything was operating within manufacture specifications for operation. Everything is working at this time.