Don't keep trying to feed after your snake refuses. Wait at least a week before you try again (& after the temps. are fixed!) & if that fails for a couple weeks, go to 2 weeks between tries.
Reason? You'll stress your snake with continuous offers once he has declined, & make him LESS likely to accept food. He won't starve- snakes are 'designed' to eat sporadically, & fast at times.
75* isn't that low, as long as his warm side is about 86-89*. But once a snake feels a significant drop in temperature, ESPECIALLY when the days are shorter (in winter), don't be surprised if they start refusing to eat- their instincts protect them from dying in the wild.
A snake "caught" suddenly with undigestible food in their gut can actually die from that in the "real world"- they simply cannot digest without additional heat to facilitate the chemical reactions (aka "digestion"). This is why those who breed snakes must have them fast for a while before they enter brumation- to make sure they aren't still digesting any food while they're kept cooler.
So while it may not be convenient for you, your snake knows what he's doing- even if it makes no sense to you.
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