Most heat mats will only heat to 10degrees F above the ambient temperature (room temp) so there is little chance of cooking the seedlings.
I do have an old waterbed heater with a thermostat that needs to be watched or it will go up to 150 degrees. I melted a plastic tray and plastic pots a couple of years ago along with cooking some peppers. It now has 2"X2" boards on top of the mat so there is air space and the temp is kept at low. Great for getting the peppers up to 90.
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there's two things money can't buy; true love and home grown tomatoes.
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