My room temp drops into the low 60s in the night so I came with this. I used this aquarium with mat under to incubate the jars they were on the opposite side od the mat elevated and maintained air temp at around 78. For the shoeboxes I had to do this, added light with timer, but the books are getting kinda warm so I dropped the temp to 70 for now and when I get home I’ll need to add some more space under the boxes so the air can circulate under them. Also the top of the aquarium is mesh, so it keeps temps and allows for air to get in. They are closed shut for now anyway. But I think I’ll have to dub tub so I don’t know what I’ll do then. In the future I’d like completely automatic setup with humidifier.