it looks like campfire does nothin, becus i could get warm near the lava blocks.

Using TAN 3.1.0.140 with Forge 2836. (1.12.2)
latest.log
https://drive.google.com/open?id=1Ib8vPwoBqcOMdLN7kdB1UpROKW-U12R8

btw the biome is Ice Mountains, i think that causes a bit xD

use /tan tempinfo and see temperature.
campfire only add +5, and this dont stacks, it's no use to place multiple heat sources
lava block add +15

LOL, why the hell it doesn't stack? what's the point? more fire=more heatness, so?...