rmoltis
The Beast Slayer
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a veriac is a voltage controller. Better than a fan controller and as you adjust the veriac you use less power. Eg at 50% the fan uses 40 of the 80 watts instead of a cheap controller that always uses 80 watts and interrupts the power to reduce fan speed.
In the picture the red thing is the veriac. It has a dial that shows voltage from 0 to 120. So 12 volts is 1/10th full speed. I love it. And the fan doesn't make that whining noise with a veriac like it does with a fan controller.
I've never had a fan make noise from my multi function fan speed controller. it is always whisper quiet.
It is also temperature probe based. So it adjusts the fan speed via temp feedback. just set your max temp and let it do its thing. heat in the house comes on it speeds up, a/c drops the house temp it slows down. it works tirelessly to maintain temps.
On my kill-a-watt meter it shows the voltage drop if the fan speed drops. you can also adjust the idle speed for when temps dip below your setpoint.
Can also have it shut off completely if the temps in the tent drop below 10° of the setpoint. which in turn can help hold in heat for a temp rise before it kicks back on (good for colder environments). very nice unit.
http://www.titancontrols.net/shop/p...eed-controller_1?categoryId=titan-ventilation
I think the problem is that you've experienced only "cheap fan speed controllers"
I'm not a fan of how the variac has only one set speed. so if the temperature of the environment changes you have to manually adjust it based on the day.
Its strong point is like you said you can adjust the voltage very precisely. Just one setting of your choice. a nice unit for sure.
Each choice has its pros and cons.
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