Hello! I can't find any sort of heating/cooling coils in the game, neither in creative mode in the menu nor using just enough items. I really hope this is a glitch and that they have not been permanently removed, as I find it much less enjoyable to play without being able to heat/cool an enclosed space with them. If you have chosen to remove them please, please bring them back in the next update. Thank you and thank you for your work!

This is not a bug, they were intentionally removed given their poor performance, horrible code, and frankly bad mechanics. Heating/cooling within your house can be achieved simply by placing heating/cooling blocks within it instead.