im only putting the chiller on to help the AC. if i was gonna use it as primary than i would probably go with 3/4hp. but our house is all stucco and even when it get up to 100 outside
its still around 76-78 in the house. so im just looking for something to keep the tank stable.
my 150rr had a 1/3 or 1/2 drop in chiller and it rarely came on and that was in a mobile home with MH lighting. i also wont be running MH lighting on this tank so that will help allot.

thank you for your input an concern though