Responded to no ac call. Found breaker off to outdoor unit. Once power was turned on checked pressures. Found pressure slightly off. Traced problem back to old humidifier, bypass was dumping cold air directly into return. Removed humidifier, patched up ductwork. Found dirty indoor blower wheel and some biological growth. Also noticed condensation drain line was pitched bad and reduced to 1/2 in. Removed gravity drain and added a condensation pump. Made all repairs necessary to restore the unit to full health and eliminate all other concerns. As a courtesy cleaned outdoor condenser