This is kind of a general question, but I'm thinking of upgrading my current setup 250w HPS with 850w portable A/C for cooling. I checked with my friend and he said this could overload my circuits. I have a little power meter thing though and its only clocking in at 8 amps right now, on a 20 amp circuit. I do have a guest house connected to the same power as the house, if I upgraded to a 600 watt light, would I be in any danger of circuits overheating?