Why buy this from the big box store for over $500 plus tax when you can buy a slightly used one for only $275?

We put in a heat pump last year and only used this for about a month. Works great and does a large area (up to 550 sq. ft.)

Here is the description from the big box store:
Maximize home comfort with the Arctic King air conditioner. This window air conditioner has a cooling rating of 12,000 BTU for high performance and maximum coverage of up to 550 ft². 3-In-1 functionality allows air conditioning, dehumidifying, and fan-only modes work together to increase the comfort of your home. Installs easily without significant modification to the existing window frame. Energy saver functionality allows the unit to shut off when it reaches a set temperature to maintain more efficient operation that saves you money Save energy by syncing the 24-hour timer to your busy schedule so it turns on automatically before you get home, and shuts back off when you leave for work Good for room up to 550 sq. ft.
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