Everybody laughed when I bought it, but I bought one of the cheap controllers from ebay for like $20 shipped. It only reads celsius, but is a dual control and has a hot and a cold side to it. I found a tutorial on youtube that is great and actually have it set up to where it heats or cools depending on the temperature.
Has worked great for when I am cold crashing and lagering my homebrews.
Figured it was worth it for the cheap price. Have had it for over a year and it has worked great so far.