I have enclosed my screened porch to create more living space(Florida Room). I am using a single zone mini split ductless heat pump for heating and cooling. It has been calculated that I need a 12,000 BTU unit. However, most of these units are available in 110 volts and 220 volts. The 220 models typically cost $50-100 more. I am trying to determine the advantages and/or disadvantages of each (power usage, unit life, ease of wiring, safety, etc.) in order to choose a unit. Any help is appreciated.

labman

I am not sure the answer is always going to be the same. In either case, it should be on a heavy duty circuit of its own. If the unit is going to be relatively close to the breaker box, the 110 might be just as well. Does your box have 2 adjacent slots to accommodate the 2 pole breaker 220 will take? Who is doing the wiring? With a nearby, but crowded breaker box, it might be just as easy for you to run say a 10-2 with ground cable for 110. The installation instructions will specify the circuit breaker needed and maybe the wire gage. If you are buying 10' off the rack at Lowe's, the next wire size up may only be pocket change more. #10 is harder to work with than #12.

Adding a circuit isn't that big of a deal. If you have never done it, I can help. There are ways of dealing with a full breaker box too.