same issues here..the IDE if left running for a while will max out 1 CPU core (on quad core system)..and not goto idle until the process is terminated..this pushes up both temps and fan speed/fan noise
this is defiantly an IDE issue..nothing to do with antivirus, or dustbunnys or any of that BS that screwballbob suggests...its an error in the IDE coding as it never used to do it with an older version (1.8.4 iirc) of the IDE...