For spaces between 100 and 300 square feet the proper small air conditioners will have a BTU range of between 3000 and 8000 BTU. 6000 BTU 115-Volt Touch Control Window Air Conditioner with Remote in White The Toshiba 6000 BTUh window air conditioner The Toshiba 6000 BTUh window air conditioner has the power to cool up to 250 sq. The Sharp Portabale Air Conditioner Portable Air Conditioner Air Conditioner Units Tent Air Conditioner . The smallest central air conditioning unit is 18000 BTUs 15 tons while the largest is 60000 BTUs 5 tons. An air conditioner works by absorbing the warm air and moisture inside your home and running it through a cooling process until it reaches the temperature youve set on your thermostat. Small ac for home . Its easy to retrofit a tiny home with a window unit and you can pick one up for as little as a few hundred bucks. 5 Signs of an Undersized Air Conditioner. Designed specifically for horizontal slider or casement windows this unit is the perfect sol...