I have a 215 Oceanic aquarium with metal halides (750 watts) and power compacts (300 watts). I also have 3 pumps in the 60 gallon sump, plus one closed loop circulation pump outside the sump. Obviously, this setup is making the water temp go up (90 F midday). I also live in Texas, and it ain't even got hot yet! So, I got a 1/3 HP Prime chiller (no controller) and then purchased a ReefKeeper Lite as well. I set the Reefkeeper to keep the temp at 78F (.4 hysteresis). This setup works well at keeping the temp at 78F. Problem is the room is hot. This room is suffering from the heat coming off of the chiller now. My wife says this is unacceptable, so I have to solve this heat issue. All I have accomplished so far is to transfer the heat from the water in the DT to the air in the room! My thoughts about what to do are below: 1) Keep working on the chiller and Reefkeeper settings to get the external temp probe not to work the chiller so much. I have the temp probe directly in front of the return pipe from the chiller. Should I move the temp probe away from the return, to get a more accurate measurement of the temp of the aquarium and not the chiller output? If so, where should it be located? 2) I personally believe, that in the Texas heat this summer, I'll have to figure another way to get rid of the heat. And the only way I can think to remove the heat is to install an exhaust fan around the chiller and remove the heated air out of the room (through the wall/attic). Or, install a central vac that will pull the air out of the room. What if I plumbed the hot air into the central air return line? 3) Go buy a bigger chiller, that won't have to huff and puff so hard? Other comments: The chiller pump can handle up to 1200 GPH, but I have it slowed to about 700 GPH, I believe, if my calculations are right. i haven't played to much around with adjusting the flow up or down. The chiller is the Prime Modular 1/3hp (used). The room has central air and heat, but doesn't get good air flow due to other factors (farthest from the plenum). Room is facing due west, with other electronics in the room as well. If I sit the chiller out in the middle of the room, it doesn't seems to work as hard, or take so long to finish a cycle. It normally sits in a corner of the room. I assume that air flow around the chiller is a big concern. I don't have another room adjacent to the DT to relocate the chiller, so the heat problem has to be solved where it is. I don't have alot of fish or coral load right now. This tank is 3 months old. All residents are ok now, since the temp is staying consistant. Ok, please help me with your suggestions and wisdom. Before we melt here.