The homeowners of a medium-sized house complain of reduced airflow coming from their registers during the summer. Their air conditioner is a 4-ton (48,000 Btuh), R-22 split system with the A-coil in the plenum of the furnace located in the basement. The evaporator has an orifice for a metering device, and the condensing unit is located on the east end of the house.
It has been an unseasonably hot summer, and even though the homeowners try to keep their house at a constant 72°F this time of year, indoor temperatures are reaching 80°. In fact, the homeowners say that temperatures and humidity have been rising steadily in the house over the last two weeks.