that's pretty broad, do you not have insulation to deal with the temperature changes.

Yes,it will be insulated. It will be central heat and cooling but plan not to keep it on went not present. I afraid expansion and moisture problem will occur using Sheetrock?

its not a good idea to shut off air conditioning and heating units and let them sit there, especially the condenser out side, they can freeze up from non usage. at least that's how it is where we are because of the ocean air. but its best to keep all the parts working.