I have been reading on the internet about DIY powder coat ovens for a while now. Just trying to decide on if it is cost effective. One thing I can't seem to find is annual usage cost. Say if you run a home made 4x4x4 oven with 3 elements, what does it cost to run per hour? I know electricity costs vary across the US, but I am just ballparking it. The plan is to start out with the old conventional oven from CL or a yard sale, then move up as the need for a bigger oven grows. A couple of things are holding me back. 1. The shear size of these things. They eat up a lot of space 2. Return on Investment- Not sure how, if any cost savings will ever be realized. Have you actually built your own oven? What would you do different if you had to do it again?