Deflation, again. I like how the HEAT control says LOW HEAT, MEDIUM HEAT, and HIGH HEAT, just in case you wondered if the HEAT control had anything to do with controlling the HEAT.

How such a dial specifically nails the temp and keeps it seventy, I don't know. It's possible the answer is in the text, but you wouldn't read that unless it was a spring day and you were having a long session in the couthouse.