It doesn’t matter the temperature (and you COULD fry at room temperature if you were in a really, really hot room, that’s how!). But you will want to prepare them ahead of time and fry just before serving, so they will probably be refrigerator-temp. In a perfect world, you have 3 Filipino aunties who stay in the kitchen frying and refilling the tray during your party, but I understand not everyone is so lucky.