I just recieved a Johnson A419 digital temperature controller, but I think I was mistaken in my expectations. I was under the impression I could plug both a heater and cooler into the controller; however it has just a single plug leading me to assume it can only heat or cool, but not both.
Is this correct? If so what comparable controllers would support both heating and cooling? Also, what is the correct term for each type of controller (single/dual-mode?)?