My partner & I recently remodeled an enclosed porch, turning it into a guest dining room. We removed all of the screens, closed in the walls & installed windows. We extended the electrical wires of the condo to provide outlets & an overhead light fixture. We added insulation in the walls to prevent energy waste & enhance comfort, & planned to put down carpet. Our largest challenge was figuring out how to heat & cool the space. The room would only be used when all of us had business, officially over the holidays. We easily didn’t want to invest a fortune into heating & cooling. We looked into extending the existing duct system to include the new guest dining room, but this simply wasn’t feasible. Adding on to the air duct was far too high-priced & required too much space in an already small dining room. Plus, all of us doubted our new gas furnace & cooling system could handle the greater demand. After consulting with a local Heating & Air Conditioning corporation, all of us decided on a ductless mini split. The ductless system is permanently installed & combines both heating & cooling capacity. There is a small outdoor compressor which is affixed to slim & lightweight indoor air handler. The affixing conduit required only a 3-inch hole in an exterior wall. The indoor air handler mounted up high on the wall, where it is never in the way of furniture. The ductless component features inverter technology, allowing it to adapt speed to new demand. Because of this, the ductless component is attractively quiet & energy efficient. It is powerful enough to suddenly heat up or cool down the space, & maintains a legitimately even temperature. 
The different types of thermostats