Probably should have given the game away and titled it Doom on a Thermostat.
I found this Motherboard article interesting on two levels (three I guess if you include security concerns). It is of course fantastic that someone managed to port Doom across to a Thermostat. It is equally fantastic that a company finds it necessary to have the power of a 1990s PC just to run a thermostat no matter how clever it is. The corollary to this is that Honeywell probably found it a darn sight cheaper just to grab an Arm9 chip and write-off the surplus processing capacity than to develop and fab a made to measure Soc. The security concern is of course that very few people will even think they have a fully fledged PC sitting on the wall of their office. (The Honeywell thermostat is really a SOHO job – Nest are the simpler home equivalent)