I dont know, most here have zero concept of how to read air temps and generally need me to school them with the science four or five times till they finally get it.
Then we get to how to actually heat a tent and thats by placing it in a room where the air temps are 20c and above not by releasing heat into the tent and hope it magically dosent woosh outa the extractor fan in a second flat lost to the cold room outside.
If your sure your sure but you seem to want to grow in 45f temps and hope it works by simply heqting the base.
Good luck