A lot of books make statements that turn out to be incorrect. Just because it got published, doesn't mean it's 100% correct.
I tend to believe it when I read hundreds of people's statements, that they've hatched eggs after refrigeration, or marking with sharpies, or whatever. I just don't believe that all those folks are lying about what they've done.
I also believe my own experience. Having hatched refrigerated eggs, and eggs that have been washed, and eggs marked with sharpies, and eggs that have been left cold by confused hens, and so on, I know perfectly well that these eggs are often a lot more resilient than we give them credit for.
I wouldn't advise sticking expensive eggs in the fridge if you're gonna hatch them. But I've had eggs I saved for hatching get put in the fridge by mistake, and went ahead and set them anyway, and gotten a good hatch.
If you are afraid your eggs may get too warm, here's the deal: If they're kept where it's below 90F, they'll be fine for a few days. If you can manage a bit cooler than that, anything down to about 50F, that's even better.
If they need to wait more than 5 days, and your house is really hot, you may want to see if you can keep them at a friend's house who has A/C. Write on the carton in big black sharpie, "Eggs for hatching, do not refrigerate, do not shake, keep at room temp, small end down!" to avoid an unfortunate incident.
You could also leave the carton open, and cover the eggs with a damp cloth, and keep them cooler by evaporation.