Question: what is the best temperature to heat up pizza?
Answer: Preheat the oven to 350 F.
Place the pizza on a piece of foil and put it directly on the rack for even heating on the top and bottom. Alternatively, preheat a sheet pan as the oven heats up for a crisp crust. ... 
Bake for about 10 minutes or until warmed through and the cheese is melted.