Interesting! I'll raise the ambient temps a couple more degrees too then... I also just bought a space heater that has a built in thermostat, but I feel iffy about leaving it on all day while I'm away at work. :s And even when I'm home to raise the temps to 78, Cake is still constantly searching/active, so maybe he just needs it even warmer... or maybe just longer term warmth, because I pretty much only turn on the heater and can observe him when I'm at home (and awake) from 8pm~1am every day.
I'll need to buy some kind of shelf or melamine surface for it too. Right now I have it on a plastic bin LOL.