Electrical – Trying to make a resistance wire heater to fool an air conditioner’s thermostat.


I am trying to put together a fermentation chamber using a window air conditioner and a Johnson Controls A14 Temperature controller. The on-board thermostat of the AC unit will not let it run as low of a temperature as I need. I was wondering if it was possible to make a resistance wire heater to tape or shrink tube to the AC temperature sensor to fool it into thinking it is warmer than it actually is allowing the Johnson Controls temperature controller to control it instead? I was thinking of using a low voltage wall wart or something of that nature for the power source. Any advice would be greatly appreciated! Thanks in advance

Best Answer

Yes, it should be possible. No, it doesn't sound like a good idea.

Regular residential air conditioners are designed with some assumptions, including a lower limit on the temperature to cool too. The unit might work very inefficiently, or not at all, at a temperature much below what it is intended for. Icing will also quite likely be a problem, unless maybe you are in a very dry environment.

It sounds like you really want a refridgeration unit, not a air conditioner.