I have a 15x22 room that is roughly 50' from the main panel, that I am converting from a 3 season room, into a conditioned space (heating and cooling, enclosed with windows and doors, etc.).
Currently there is a single 110 outlet in this room. This will not be sufficient as I want this to be a fully functional room that I can use most of the year. That said, I want to put in one of those split wall heating/ac units, maybe a ceiling fan, lights and enough outlets to fill the room while still meeting code.
I live in upstate New York. I plan to put a back-up fridge (which I know is supposed to be on its own circuit for starting amps), maybe a plug in lamp, tv, and a few other small items that won't necessarily all be on at the same time.
I looked at Home Depot and found a 6awg 3 wire cable with ground that says the max amperes are 55. So my question is, basically, on the proper amperes for this room, a proper sized sub panel and the correct breakers, so that I don't overload the sub panel and catch the wire on fire from overheating.
As I looked around HD's website, I began feeling like I would need a 100 amp sub panel at a minimum as the available slots for what I need don't seem to come on a panel that is rated for the 6awg wire specs. Do I need a larger (4awg) wire and a minimum of a 4 slot panel? I figured I could put lights one 1 slot, outlets one 1 and a double pole breaker for the heating/ac unit on one. Any help mapping this out would be pretty great.
p.s: The main panel is pretty full, but I had installed an electric tankless water heater that took 6 spots for 3 double pole breakers for each heating element that I can steal the space from since the wife doesn't like that the 27,000kW makes the lights in the house flicker, so we went back to a standard tank water heater.
Panel is a Square-D Homeline HOMC30UC Series S01.