removing an envsys temperature limit

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

How do I remove an envsys temperature limit?
For a voltage limit, it seems to work to set it to an empty value, but for 
a temperature, I get a syntax error.
No, the answer is not "envstat -S" since the limit I want to get rid of (a 
critical minmal CPU temperature) is apperantly set by the BIOS. I don't expect 
my hardware to suffer from under-temperature.