Frigidaire's FFRA0511R1 5, 000 BTU 115V window-mounted mini-compact air conditioner is perfect for cooling a room up to 150 square feet. It quickly cools a room on hot days and quiet operation keeps you cool without keeping you awake. This unit features mechanical rotary controls and top, full-width, 2-way air direction control. The washable mesh filter with side, slide-out access reduces bacteria, room odors and other airborne particles for a healthier, more comfortable environment. Low power start-up conserves energy and saves you money plus, effortless restart automatically resumes operating at its previous settings when power is restored.cooling power:5000. The size of the window unit needed will depend on the size of the room you wish to cool. To determine which size you need, measure the width of the room by the length and multiply those numbers together to determine the square footage.