Hello sir!
I've had two 6" Hyperfans for a few years, I'm in love with them.
I just got a new gadget a few days ago, basically a thermostat that automatically ups the fan speed whenever the probe (put in the canopy) gets above a settable temperature.
You also set a minimum fan speed, so it doesn't turn right down at night or when it's cold.
Sometimes at night, which coincides with their nighttime, I'll have a visitor over and turn the Hyperfan way down to its quietest to have a chat. Then I might get drunk and forget it, the tent getting pretty hot for a few hours in the morning.
This is the ultimate prevention for that, I'll never have to worry - it will always kick the fan up when it starts getting hot in there.
The one downside I've found so far, is that sometimes it will kick my fan to loud levels while I've got the window open. Slightly disrupting to my privacy methods.
Search Ebay for "
PHRESH HYPER FAN HYPER CLIMATE CONTROL HYPERFAN" to check it out