I have a 300 sq ft loft above my detached garage which currently is studs only except for basic sewer/water lines, and one circuit from a small subpanel in the garage. The subpanel consists of the following:
-- linked to the house main with 60 amp breaker
-- contains two 15 amp breakers; 1 breaker for garage lights (two)/outlets
(2), and one breaker for loft lights (two)
-- maximum of 4 breakers can be installed in the current subpanel
I want to finish the loft (insulate/drywall, etc) and will need to add a small ac/heat type pump in addition to more outlets, lights, etc. Since the loft will also have a shower/bathroom, GFCI will also be needed.
Question: Can I replace the current subpanel with a bigger subpanel to accommodate the additional wiring
/cirucuits, and also the ac/heat pump (it will require 220)? Or, I need to run/bury a separate line from the house main breaker to the garage specifically for the AC/heat pump? When I was talking to a local AC guy, he thought I needed another line.
Let me know if you need additional information.