Completed 7 system cooling maintenance. All filters are clean. Upstairs guest house bedroom is low on refrigerant. System is very old and should be considered replaced. Other option is adding a leak seal to fix freon leak. This system should have a inline water safety switch install. Main level guest house system is old but working good. Both system should also have a start kit installed to increase lifespan and efficiency. Main level house system is working good. Along with the Masterbedroom. Main house basement system is old and outdated. System is cooling good.