Agreed on 320 watt setup being more powerful and cheaper, but is 150 Watts not enough to keep water temps stable for testing purposes?

If you put the max watts through the TEC then you will get 0c temp drop.

I don't like standing next to a AC all day long. Way to much noise.

I will need at least 300watts to keep things were I want them. Thats why I figured 2 tecs over 300watts and then half the power to each of them. Should work out. I plan on making my heat die variable from 50watts to 150watts. And then the pump it self is like 55watts. I figure 300watts should be enough to drop the temps below room temp if room temp goes above 25C.

I think that will work.

I assume you are going to insulate the system, this should improove efficency by allot if you do a good job :)

Edit - there is a thread on the PSU / controll system here - http://forums.procooling.com/vbb/showthread.php?t=12147

I was able to start moving into my new place and I think I might not have to worry about chilling the water. THe new place not only has an A/C already in the room but the whole place is cool all day long as it is shaded. :) I was in there at prime heat time today and it was about 70F. As were my old place is about 85F this time of day and thats with A/C. I will get the test bench setup and do my first round of testing without the chiller and see what happens.

I am still going to build this chiller though. Just might not do it as soon as I was planning.