I added a room to our house for sewing/crafting and put in a Mitsubishi Mr. Slim inverter. No ducting/venting etc. just the cabling run up the side of the house from the outside unit and a 3" hole in the wall from the outside to the unit on the wall inside. It's on a thermostat and WONDERFUL!!! Can put the fan to silent mode and don't even know it's running. Heats and cools beautifully.