I never ran a chiller on any of my MH tanks. I did set my AC to 78 degrees and leave it on during the day. That was enough to keep the tank from getting too hot.
My problem with chillers is every goes and buys one when often they don't need it. I wonder how many people vent their chiller outside? Most setups that I've seen people don't. They have the chiller next to the tank. The chiller kicks on and starts blowing hot air into the already scorching room. Your tanks drops one degree and the room raises 2 degrees. You already have an insanely humid room as is with the high temp your tank has likely lost a LARGE amount of water through evaporation.
Adding hot air to a hot and humid room is the last thing you want to do. Now as your chiller continues to heat the room it needs to work harder to keep the tank cold in this oven you've created.
That was my point about chillers. Keep your curtains closed, top as open as possible and leave your AC at 78. It will use MUCH less electricity than your chiller will (if not vented), it will keep your house cool and keep the humidity low which will allow the tank to cool itself via evaporation.
Ah but I digress
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