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The bathroom checklists are a collection of tools you can use to make informed decision when you're planning a new bathroom (or bits thereof).
Air conditioners are refrigerative coolers. While these aren't the most efficient coolers available, they are incredibly effective and provide excellent cooling in any climate.
The fine resolution of modern projectors, in some cases, can create an unwanted 'pattern' as it interacts with the texture of your projector screen. See why this happens, and how to deal with it.