Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to use an arctic air evaporative air cooler [title] Find a good location for your arctic air machine. [step] Set it up on a flat surface, such as a tabletop, where it can't slide. [title] Prepare the room with alternative cooling methods.

Ending1: [step] Warming up the room is one of the easiest ways to keep the temperature relatively low-particularly at night. Heat up the air by heating and cooling down layers using an air compressor and then adding liquids, or other cooling formulas. Ending2: [step] Arctic air is best used a supplement to other cooling methods; it's not designed to be your primary cooling method. It's a compact, personal system, rather than a whole-room or whole-house air conditioner. Ending3: [step] Though strongly discouraged, using other options to keep the temperature mild can be less efficient than using a cooler, such as putting on insulated layers. [substeps] Use a thermostat instead of walls. Ending4: [step] Leave the air dryer running after you open the air conditioner. If there are other chairs available, put them on so that people can move about freely and avoid bumping into the air vents.

Answer format: ending1/ending2/ending3/ending4