My personal opinion, not based on anything but my own observations, is that if the soil is warm, the seedlings can tolerate a little cool air. You might also put plastic or some other kind of buffer around the seedlings to hold some of the heat from the heat mats/soil. It may increase the air temperature around the seedlings by several degrees. If you have artificial lights on the seedlings, putting something like aluminum foil around the lights and seedlings will help hold the heat from the lights.
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