After checking the AC and furnace, I noticed that the split delta temperature was a bit low. Checking the condenser refrigerant level was at 0.9 subcooling when it should’ve been at nine. Compressor is also overworking itself. There’s definitely a leak somewhere in the system, which is pretty typical for something of this age. The furnace itself is operating flawlessly and all electrical components are operating well within manufactured specifications. The ductwork however, is extremely dirty and there are signs of microbial growth so I would like to clean the ducks and put a UV bulb with germicidal unit inside the transition to purify all air and kill all microbial growth.