Never heard anything about warming to 100F to be honest but I warm with a hairdryer plugged in next to the vivs so you can offer whilst still warm plus the hairdryer doesn't wash all the rodent aroma away..
This method WORKS if done properly ...
I wait until evening as they're nocturnal of course . I let the rodent thaw out in the reptile room so they get the smell ..
Then I warm up the mouse / rat with a hairdryer and offer with tongs IMMEDIATELY whilst still warm . If refused simply repeat the heating and offering as many times as needed. .
A couple of mine will only strike feed from within their hides so I dangle the warm rodent in front of the hide's entrance - usually works but if it fails simply reheat the rodent with a hairdryer and immediately offer again whilst it's still warm , continue until it's grabbed ...
I always wait until evenings to feed as they're nocturnal of course .
Incidentally , if it shows no interest at all not even a tongue flicker maybe it's best to leave for a week or so.