Performed customer hvac inspection. This is a rental house customer is tenant who made appointment. Landlord not on site. System has a (16x20x1) filter, no filter rack installed, filter inside the equipment. Furnace has no data information is 16+ years old the ac and coil is 16 years old r22 refrigerant. Checked over all operations of system, upon arrival tenant explained to me that they were having air flow issues to the left side of home. Stated that they run a portable ac unit all day due to system not being able to keep up until night time. Found that there are a lot of air leaks in the supply plenum. Duct runs were taped using duct tape and are falling apart from system. Duct system is in poor shape and old. There is not enough return air vents In home and instead of being in deleting they are installed in the walls towards the floor. Thermostat sits in the hot area of the home. Blower wheel has a lot of biological growth build up, blower capacitor is bad, a lot of biological gro