I have an HG Burrow/Incubator 30*F, 40 degree with 30 degree baffle mods (LOVE IT!!!) setup that I added a folded down throw blanket that gives me an additional, at minimum, 1" more loft. I'm thinking 0 degrees F ??? (-17.78 C)... Sound about right? (I'm a nerd, so please show your math!)