@Samuel_Bucher - Fair enough. Not sure when that got broken, since no one has mentioned it until now. My bad, I don't really use that stuff. I have fridges and fans and stuff from my other mods XD

Anyway, I have changed up things a bit. Given that I also use Replace Stuff , I have added a patch to gate that mod's "over wall cooler" and "over wall vent" behind Microelectronics to coinside with the wall heater from here. I replaced the graphics with the ones previously used for cooler and vent in this mod. Vanilla vents and coolers have been reverted, but I made replacement graphics for those so they match up with the over wall ones.

This was the quickest way to deal with this issue, and also fixes the otherwise redundant cooler and vents having both mods ends up with.

I have run the mod by itself. Nothing but Simple Utilities: Wall Adjusted, Harmony, and all the DLCs. I can't place the cooler and the vent unto a wall or by itself. It just says "Must be placed on a wall and facing a clear space". Regaring the wall heater, the wall light panel, and the fence post lights - those all work just fine. Do the following to replicate my situation:
1) Run the game with only Simple Utilities: Wall Adjusted and Harmony. DLCs are not a factor.
2) In a dev test world, either find a ruin wall or god-mode build a new one.
3) Try to place the cooler or the vent over it and observe the fact that that's not possible.

@Samuel_Butcher - The mod works fine, it's just you.

I have a ridiculous number of additional mods, and it's working fine. The likelihood is that you either misunderstand how the mod works, or have some other mod that is causing an issue for you.

Regarding the former:

You state the wall utilities can't be placed, but this mod adds only the wall heater, and wall light panel, both of which require Microelectronics to unlock. The remaining additions are fence post lighting, and those are mounted on fences, not the walls.

Naturally, both walls and fences have to be built before these items can be place - one can not place them on a planned wall/fence.

Regarding the latter:

Run the mod by itself and you'll see it's working as intended. Go through your mod list and see which mods are likely to cause an issue. Test again until you find the culprit.

This mod doesn't work. The wall utilities it adds can't be placed on walls, or anywhere. And if you also have Replace Stuff running along with it, that mod's wall utilities can't be placed, either. The ones from Vanilla Temperature expanced are not affected, though. As things stand, this mod is unusable.