It seems that to some degree, if you can dream it, you can do it with a Raspberry Pi.  We are constantly amazed with the uses that people find for the little computers.  And we are big fans of anything that will save someone a trip outside in a bitter cold winter such as we are having this year!  Therefore, we found these articles by alaskanshade interesting:

Home Heating Hacking Part 1 or How to Measure an Oil Tank

Home Heating Hacking Part 2 or How to (Almost) Audit a Furnace

We don’t know if there will be more to come in this series, but you can always check alaskanshade’s blog to find out.  To us, this seems a bit more practical than, say, a Raspberry Pi Power Cat Feeder (yes, someone really built that).