The thermostat stays stuck at 76, even after lowering the temperature. The a/c doesn't blow a lot of cold air, but seems to run. The a/c unit freezes up even after replacing the motor 3x already. Replaced the thermostat 2x already. Freon is OK. Not sure what else to check. The a/c company has been to my house 5x already and they don't know what is wrong with the unit. They stopped answering my calls. Help, please.