Popcorn has to reach a certain temperature before it will pop, but setting the temperature too high, will likely cause some of the popcorn to burn, although it will speed up the rate of popping.
Warmer the room the faster it will stale=less lower quality popcorn
Warmer the room the faster it will stale=less lower quality popcorn
Should not affect the popping, unless you store it in the fridge.
Yes it does and you can store it in a fridge