This is like a placebo, intended to trick you into perceiving cold or less-cold when it isn't there. But when there's a real matter at hand placebos only work

This is like a placebo, intended to trick you into perceiving cold or less-cold when it isn't there. But when there's a real matter at hand placebos only work very temporarily – then eventually reality catches up to you. So if it's actually hot, and my body needs to react to that to regulate my temperature, this doesn't change that. But I suppose it would let you turn the temperature up a couple degrees.