If you have laid sod before, cut out the dead sod, and cut in to fit new sod.
As you take out the old, check the soil where it died.
Looks like bad sod, sod doe not take well to heat period; I have laid thousands of yard with good sod and cheap crap sod.
Heat kilsl both.
We would lay rolls not used, but would be, out on crushed gravel and kept them wet till we needed them.