Arrived on site to preform a 3 system maintenance, upstairs, replaced a bad 7.5uf capacitor, checked electrical connections and amp draw, cleared drain line and checked media filter. Main: installed a wet switch on the furnace, should have been done during install, cleared drain line and checked media filter, checked electrical connections, amp draw, and capacitance. Basement; checked electrical connections, amp draw, and capacitance. Cleared drain line and checked media filter. Recommend installing water safety and back up to prevent water damage. Outside, cleaned condensers, checked all electrical connections, amp draw and capacitance on all motors. Checked refrigerant levels on all systems, found basement unit low on refrigerant, scheduled for consultation to replace system.