Had the same problem for years. All above excellent ideas and in the long run when you get tired of your chiller running (make sure you do get a larger one than recommended, I have a 1/3hp for total water volume of 120) try to attack the sources. Pumps and lights are the big enemies heat wise. Look into the new Vortech powerheads, motor is on the outside of the tank so no transfered heat. I'm putting my return pump outboard of the
sump, should help. I bought a new
skimmer that uses only one pump instead of two and draws 18 watts instead of about 60. And the big ticket item everyone is raving about, including me, is the new LED lighting systems by Solaris and Aqua Illumination. I love my Solaris for the lack of heat alone although it has plenty of other benefits and features too. Good luck and stay cool!
