Many hotels list 'air conditioning' as a feature in the room.

How many people would be OK if the hotel said "Yes, the room HAS air conditioning- but there is a fee of $50 to actually USE it"

IMO if a hotel lists a fridge as a feature there cannot be an additional fee to use it. (Note listing a 'mini bar- fee applies' is a different story.)

Finally, I have stayed at a few hotels that will bring a second fridge to the room, no charge- if you need it. If you want, tell them you have medications that require refrigeration....iver never had to.