Completed b1 on Ac. Upstairs: filter is clean and temperature drop is 17.3°. All readings are within manufacture specs and system is operating correctly at this time. Downstairs: Filter is clean and temperature drop is 17.8°. All readings are within manufacture specs and system is operating correctly at this time. Condenser coils were slightly dirty. Cleaned coils with water hose. I recommend considering replacement of older condenser due to age and phasing out of R22 refrigerant.