Originally Posted by GotGarlic
I've never covered fried food with a lid. The steam would soften the crispy crust and ruin it. I just use a spatter screen.
This sounds right to me.
If the temperature is just right with the lid off, then you don't have to adjust the heat. If you put a lid, it will slowly get hotter (less heat escaping) and you will have to fiddle with the heat setting and take the lid off to check the temp. I hope that made some kind of sense.