Arrived on site to preform a 2 system maintenance, gave quote on duct cleaning with blower assembly and coil cleaning at the customer’s request. Upstairs: found filters completely clogged (changed 2 16x25x1). Both blower motors dirty running on 7.5uf capacitors (reading 4.3-4.2uf). Dirty evaporator coils on both, causing coils to start freezing. Outdoor: both units have duel run capacitors reading low and older system has a burnt and pitted contactor. Both units refrigerant systems are reading lower than normal pressure.