Put it in the shade for a while, somewhere where it will only get morning sun, like under an overhang with a wall behind it. Or just under a nice 60% shade cloth, if you have one.

What "tyler la" said. The shrub might need to be shaded, partially, for two months, to give the roots a chance to develop and become capable of supporting the leaves. If you have another opportunity to pick up bare-root blueberry stock, one way to be successful is to simply pot the seedling, and keep it in a more protected spot, out of direct sunlight. We have an open porch on the north side of the house that I use for this purpose. After a few months on the porch, I can transplant the potted seedling in September, around the middle of the month.

blueberries like acidic soil. Heat or no heat they will not thrive and perhaps die if the ph is to high.