If it's hot enough to screw up your bike computer, wouldn't the heat also be dangerous for the component materials of your bicycle helmet? I'd be a bit worried about the foam melting and being in a less than optimal composition for protecting my head in a collision.

I'm glad to hear your worms are still going, and are getting a spiffy new hand-made home! I think too many of my colony died while I was neglecting it, so I need to get a fresh batch and start again.