Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to install a split system air conditioner [title] Select an unobstructed location on your interior wall to mount the indoor air conditioning unit. [substeps] Avoid direct sunlight and heat sources. Avoid locations where gas may leak or where oil mist or sulphur exists.

Ending1: [title] Place the unit in a convenient location. [step] Set it up high and away from an open window to get an unobstructed view of your inside work area. Ending2: Set the unit head to a temperature between 60 and 230 degrees fahrenheit (49 and 90 degrees celsius) to conserve hot air. [title] Consider mounting the outdoor air conditioning unit on a high surface. Ending3: The indoor unit requires at least 6 " (15 cm) of open space surrounding its top and sides. The unit should also be mounted at least 7 feet (2.13 m) above the ground. Ending4: [title] Connect the car's adjustable water pump to the compressor. [substeps] The ideal location for a split unit air conditioner is inside a roof, which may be partially hidden from warmth and light.

Answer format: ending1/ending2/ending3/ending4