Ok, let's hear it!

[mrhasan]

Originally Posted by Aqua-Digital

Again simple reply, set your house AC to 71F and thats that, no extenal heat source to raise the tank temp

I live in Ontario we have sky high temps in the summer and I have no chiller or fan on my tank. No need, the AC does that for me and the LED gives off no heat.

Check out my build on my forum, no fans and no chiller. We had over 90F regularly in ottawa this year.

You would have to have the AC irrespective of whether you are running LED or MH. If you set 71F at the AC, the tank temp without light/heater will hover around that. With MH, it will probably raise the temp by 10F max (if the lamps are raising more, you are probably keeping the lamps too close to the water). So your tank will eventually sit around 80F to 82F. With LED, your tank will need heater to get that up.

And with AC running, you won't need chiller isinit? Unless you are running like 400w MH over a 12sq. inch surface area. (some of these numbers are vague and just came from my mind; please do correct me if I am wrong).