My Sanyo Air Conditioner Model No. KS1211W is not cooling. I've found the filters removed and cleaned them. I've also vacuumed the what I believe is the intake grate on front of the unit. The remote is working after I replaced the batteries. This Air Conditioner has not be used for several years, why is not working what could the problem? My husband purchased this A/C unit many years ago and when we moved it came with us and was installed in his computer room.