if u run 1600 watts of lites on a 120 volt circuit u draw ~13 amps plus 1.1 for existing fan, yore about 15 amps. that leaves 5 amps for 2 more inline fans, a circ fan, and pumps, etc. if youre DWC, totally doable in my opinion. as far as heat, put the EZ8 in the 4x4 and add a carbon filter/fan...