I've tried several different ones and this is the best I've found: http://www.qcsupply.com/commercial-...mount-variable-speed-controller-110-volt.html. Automatically adjusts the fan speed to maintain the set temperature. Stay away from the CAP ones. I had two fail right out of the box, returned for new ones and one of those also failed within a week.
I bought this unit when I copied a Cab Cooler to control the converted dehumidifier. You will be surprised at the quality and sophistication of this thing. Mine is in Fahrenheit. There's only one power out connection so if you run more than one fan you will need to split that..
Just put the out wires to a receptacle strip or even a multi receptacle surge protector. It should run as many as you have room for but all to the same parameters.
The key to it is reading the instructions all the way thru before trying to program it. They start out ok but get murky if you try to just start pushing buttons step by step. There is a confusing glitch in the translation that gets clarified towards the end. At least in the US edition.
I just edited out a line directing to a more detailed description that I forgot never got posted. Sorry if you saw it and looked for it.
I've been using it for a couple months and am very pleased. If you have any questions about it just ask.
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