oomis writes: ‘you cannot do it to heat up the room on a cold sukkos day”. Don’t bet on it. Iif you hold that “mitoch’ allows you to do the melochos on yom tov even without oichel nefesh, as is the halocho, then heating up the room on a cold sukkos day would be allowed. It is “zorehc kzas’ for sure and actually, we are all “sick’ when it comes to cold. (hakol cholim eitzel tsinah) So your statement in this context is wrong.
