>>16136487
>Mass may be an irrelevant concept in GR but OP is probably thinking about rest mass
Why do you believe that he was thinking about rest mass? OP did not even mention mass. He inquired on the effects of temperature on weight. Weight is a gravitational phenomenon, and GR is the most accurate description of gravity we have.

>you even admit is still a relevant concept in other areas of physics
Oh yes, but irrelevant to OP's question though. Weight does not depend on rest mass, and it should be rather obvious that a freezer would not affect it anyway.

>pedant
Kind of a lame comeback now. What you said is categorically false. Even the notion of heat being photons is plain wrong, I just ignored that as it's hardy relevant to the topic. In relation to something that you would have in a freezer, thermal energy is effectively kinetic energy

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If heat is energy and energy is equivalent to mass and you bring a freezer to freezing temps, does it weigh less than at room temperature?