Replaced all filters. 1st floor system blower wheel is clean evaporator coil is clean. Eletracal connections are tight. Getting 20 degree heat rise voltage enhancement system read within factory spec. Eletric heat strips are working. Eletracal connections are tight condenser coil is clean operation normal at this time. 2nd floor system getting 22 degree heat rise blower wheel and evaporator coil are clean. Eletracal connections are tight. Heat strips are working. Condenser coil is clean eletracal connections are tight no rub outs. Voltage enhancement system read within factory spec. operation is normal at this time. 3rd floor furnace getting a 24 degree heat rise. Blower and evaporator coil are clean. Blower and evaporator coil are clean eletrical connections are tight Checked heat strips. Outdoor coil is clean eletracal connections are tight