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I've had the original Kendrick Premier controller for many years and it works well. The power cable became brittle over time and I had to open up the controller to fix that but not a big deal. The thing I like about it is it measures ambient temp and humidity and then controls heater output to maintain a fixed heater margin above the dew point so you never have to adjust anything and it only applies heat when it is required. Mine also has a pc interface to allow settings to be changed from the computer however I have found the serial coms a bit flakey more recently - not sure if that is Wind 10 update related.
With what I have learned about Arduino more recently, it wouldn't be difficult to build a similar dew controller at a fraction of the cost however I still use the Kendrick one while it is working.
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