iPower Variable Vent Duct Inline Blower Fan Speed Adjuster with Temperature Controller for HVAC Ventilation System, 750W 6A

I use this to control the pumping of hot air from my computer cluster into my bathroom that was previously always cold. The speed adjustment keeps the fan from being too loud and blow way too hard (200+ Watt fan connected), and it keeps the box the computers are in at precisely the same temperature at all times. That is best for computers (no thermal cycling). It replaced a setup I had built myself out of a snap switch, solid state relay, and wall wart power supply. Way less work, prettier appearance, and it gives me the ability to adjust the temperature and fan speed. My one complaint is that all the labels on the device are all in Celsius, and even if I select Fahrenheit, it reverts back to Celsius as soon as any adjustment is made.

This controller is too sensitive it. Once setpoint is reached it will come on then go off. This can continue for a bit. It really needs a delay of some sort. It would be good to have a heat and cool mode as well so it energizes when it goes below a setpoint, but this review is mainly for the sensitivity and constant cycling issue.

The knobs are hot and get whacked, the plug is scary loose, and this thing only worked for a day. Waste of time and money