I think the best way to save power is to try to fight yourself as little as possible. It seems to me the folks having these problems are trying to grow inside while it's warm outside. They fight themselves by bringing heat in then trying to get rid of it. So before you try to get rid of it, lets first determine if it has to be here to begin with. If you can install some of the heat generating components outside of the envelope of your home, that is less for the AC to handle. This mainly means relocating the power supplies for lights and the air pump to either an outdoor box or your garage or similar. You can also add liquid cooling to your lights and pump the coolant through a radiator again outside/garage. And finally, choose lighting that produces less waste heat, especially waste heat that must be released indoors.
If you are crazy enough you can even bury a 55gallon drum, with a hose for a "snorkle" and put your air pump in there so it pulls air cooled by the earth.
BTW, I don't have this issue, so I just made up a few things that sounded good in my head.
I only run in winter and then it is about 2/3rd of my heating system, hum, maybe I should make it 1/3rd bigger? I do run my air pump in my garage so I can push cold/freezing air into the res and keep it in the 60's.