My air conditioner sits out back of the house on a hard plastic base. Over time the base and unit are now slanted toward the house and we would like to get it re-leveled but have no idea as to how to lift up the unit to do it or who we should call to have it done if it is one of those things best left to professionals. Right now the unit functions perfectly well so we don't feel we need to be calling a repair person. The house is a ranch with a basement and the house and unit are about 9 years old. Would appreciate any thoughts on how we can correct this before it gets any worse. We are 2 senior citizens but still in good shape so can do some work ourselves.