Two major decisions should guide your purchase of a room air conditioner. Buy a correctly sized unit. Buy an energy-efficient unit. If the room is very sunny, increase capacity by 10%. If the unit is for a kitchen, increase the capacity by 4,000 Btu per hour.
When wiring or rewiring your workshop, consider installing extra outlets in the ceiling, positioned over groupings of power tools. Ceiling outlets can be more accessible and can help eliminate tripping over extension cords. If you are setting up or remodeling your workshop, also plan to install at least one outlet every 3 ft. around the perimeter.