I have been using one of these for years
https://www.amazon.com/Pangea-Reptile-Heat-Mat-Small/dp/B07MJQ1GWL/ref=sr_1_7?crid=1A2CLRSOB10AC&keywords=4x4%2Bheat%2Bmat&qid=1645571093&sprefix=heat%2Bmat%2B4%2Bx%2B%2Caps%2C94&sr=8-7&th=1
i seen one like that at pet shop thanks CPW ....
