Just to clarify, are you saying you had no uefi problems, or temps problems with other distros?
Because my suggestion would’ve been to run another distro (any live will do) and check if the temps issue is still present. That way you’ll know if its Qubes-related.
If that’s the case, I also ran into a similar issue and I solved it by installing the kernel-latest iso: QubesOS 4.1 Signed Weekly Builds