Get more life out of your sanding paper. After you've used an abrasive a few times, debris will become embedded in the tiny grit particles. This may reduce the effectiveness of the abrasive, but not necessarily mean that you need to replace it. There is a "abrasive eraser" available that will work to remove the particles and restore sanding power back to your sanding sheets, belts, disks, or drums.
Air conditioners need room to take in and exhaust air and should have at least 18 inches of clearance from furniture, plants, and drapes. If the air cannot circulate around the unit, heat may build up and cause damage to the coils.