so ive been beating around the idea of getting into a bit of metal smithing for fun and i built myself a pit foundry. i fired it up today using just some dried wood i have stacked in the back yard and by my estimate i managed to get the temperature up to around 1400 degrees (conservative estimate) ; this is considering the glow of the steel i placed inside. because im only interested in casting copper and bronze right now its still not hot enough for that. with that said i can get to my question. i know that i can get it hotter just by using charcoal instead of wood but will it increase it to the 2000 degrees i will need to get it to melt and the excess i will need for casting? or will i need to consider better insulating materials?