Honestly, just do a pull string if you are not doing the 3rd now. Save yourself the cost now, but make it as easy as possible to do it when the time comes. Also, do no smaller than 1" sched 40.

I just did this, final electricial was three 20 amp off of a dual 40 amp subpanel from the pool equipment. One is for lights and outlets (four total, one on each wall), one for the lights and networking equipment, and the last for the air conditioner and heater.

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Almost the same size, 14x14