When using a screwdriver, the most common mistake people make is to use the wrong size driver. You should always try to match the size of the screwdriver blade to the size of the screw as closely as possible. Mismatches will frequently result in the screw stripping, excessive wear on the screwdriver blade and a more difficult and time consuming job for you. Fortunately, finding the correct match is easy because screwdrivers are available in a complete variety of sizes and types.
Change the filters regularly. Dirty filters restrict air flow, reducing efficiency and worse case, can cause the evaporator to ice up. Disposable fiberglass filters should replaced. Electrostatic or electronic filters need to be washed regularly.