Second floor wasn’t cooling down. It’s a single system home, zoned. Tenants were turning off the main floor thermostat to save energy, so all of the heat was rising to the second floor. Main floor was 76 degrees and second floor was trying to maintain 68 degrees. Filter was completely clogged, landlord approved changing it. Because filter was clogged, now the blower wheel is dirty. Dirty condenser coil as well. Landlord didn’t want to proceed with my repairs besides changing filter.