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Performed heat pump check up check electrical low and high ok replace filter check and test electric back up ok check split ok, check outdoor unit capacitor and contactor ok test defrost check 410 pressures ok outdoor temp is 23F 280/60 cycle unit ok would recommend ac renew additive to lubricate internal parts from compressor, and also all valves, this will help reduce noise and all internal moving parts(txv,reversing valve, and compressor) will be lubricated