This mid-sized model from Black + Decker has everything you need in a terrific air conditioner that is both efficient and cost-effective. It can chill rooms up to 350 square feet, so it’s perfect for bedrooms. Best Jhs 8000 Btu Portable Air Conditioner 1.LG 6,000 BTU (DOE) / 8,000 BTU (ASHRAE) Portable Air Conditioner, Cools…