Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean an air conditioner [title] Replace the air filter. [step] Purchase a new air conditioner filter at your local home improvement store. Consult your owner's manual for the correct size, or take your old filter to the store with you.

Ending1: [title] Download air conditioning and air conditioning tools. [step] Go to the nearest gas station and buy air conditioning parts, a registered air conditioner kit, moisture meter, or bucket sizer to clean the model. Ending2: [title] Turn off the power to your furnace or blower. [step] If you can't find the shutoff switch on the unit, then turn it off at the main panel. Ending3: Replacing the filter can cost anywhere from $10-$25 for a used air conditioning unit, to $200 for a new one. [substeps] Check the instruction manual that came with your home improvement unit to see how much water the filter will need to cool. Ending4: The new filter should be about an inch (2.5 cm) larger than the old filter. Make sure the dust inside of the filter and the weight cannot degrade inside the new unit.

Answer format: ending1/ending2/ending3/ending4