I'm installing air conditioning, heater and ventilator for my home garage. Probably 3 separate units (unless you know of a unit that will do all three functions). To limit the amount of holes into my 100 amp garage sub panel, and since I will only use the above one at a time, can I run wire for the largest of the three loads to a junction box. And the power for each will be taken from this junction box (split). An air/vent/heat thermostat will control all three so that it's only possible to run one of the three at a time. Can I run the control wires thru the sub panel in the garage? Is this all ok with the NEC? If not, please site source.
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