All the coolant would leak to one side and not be as good at air conditioning the home.
Landlords are never honest with you. When I moved into my rental home the landlord told me that the HVAC was serviced and he didn’t want me to call and complain about it later on. That automatically seemed odd to me. I did some investigating and found out that it was in no way serviced. The air filter had pounds of dust, dirt and hair in it. The inner workings were dirty and moldy. It looked like nobody had touched the HVAC machine for a very long time. Thankfully I am a HVAC contractor. After work one day I brought my tools home and did a proper tune up on the machine. I lubricated the fan motor belt, put coolant in the AC and changed out the air filter. The machine worked great. I see where people would complain about improper heating and cooling. When the machine is trying to work through pounds of dust, it cannot function as well as it should. I also noticed the outdoor unit was sitting at an angle as well. All the coolant would leak to one side and not be as good at air conditioning the home. I just bought a few blocks and righted the outdoor unit. It was a simple job but the AC was so much better afterwards. I stayed in that rental for about two years and I know I made the place better. I fixed a ton of things and that HVAC machine was working like a champion when I left.