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There are companies that sell USB interface devices for your computer. For about $50 you can get an interface with up to 8 digital I/O ports and sample code for C++ and VB.
You can place a thermal sensor on one of the channels and some relays on the others.
Short answer is yes, it is possible.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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