I just wannted to comment on this story, but there's no button to do it. I discovered a 'Johnson Controls A19AAT' which is a mechanical refrigerator override (no electronics = no batteries or AC phantom load). Set the dial, plug this in, and plug the refrigerator into it. No technical guru stuff.
A PDF describing the device: http://cgproducts.johnsoncontrols.com/MET_PDF/2476642578.pdf
The original article: http://mtbest.net/freezer-to-fridge-thermostat.html

Welcome to Green Hacks, where our passion is getting more for less (legally, of course). Here you will learn how to make ordinary household systems run cleaner and more efficiently. First hack: a super-efficient fridge, easily.