What is Reddit's opinion of JUMP START Heat Mat, 3" x 20" Inches MT10004 Waterproof Durable, 7.3 Watt UL Certified Seedling, 3"x20", 7.3W?

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I actually use these for my windowsills. While I have both, you can get the temperature controller separately. I put them under the pot and the temperature sensor on top of the soil.

https://www.amazon.com/Jump-Start-MT10004-3x20-Seedling/dp/B0044U4F5I

I got 2 of them. Work great. Originally, I wrapped them directly around my jars, but it was raising it 20°-25° which put it too high for my liking (~85°). I then put it under a piece of Styrofoam and it did ok but being heated from beneath seemed to slightly alter my brew taste. I now just wrap a towel around my jars, then wrap the mat. Keeps the light out and keeps my jars at a relatively steady 72°-76°.

Barely take any electricity as well, which I love.

I use these. Maybe it's cause I keep my house so cold, but I care barely tell mine are on.

You should also get a thermostat which will toggle the heating mat on and off and keep it at an ideal temperature. You set it to 72, put the probe at the top and it'll do the rest.

https://www.amazon.com/MT10004-Waterproof-Certified-Hydroponic-Germination/dp/B0044U4F5I