I used this on a faulty thermostat on a 1953 Frigidaire fridge. It's accurate and gets the job done at an extremely low price. I only use the "cold" side of the heating/cooling relay kit, but after the initial setup it worked fine for several months. In addition, operating costs have been reduced while maintaining a narrower temperature window. It took a few tries to set it up, but I didn't touch it after that. Hooking it up to your system is super easy, I also use an auxiliary fan to cool the compressor. I bought one as a spare and bought another to install on my 1946 GE refrigerator. So of course I would buy again.
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