A combination cooler/heater that goes over a wall. Set a temperature and the Temperature Control Unit will do its best to keep the room that temperature, no matter if it is hotter or colder. It will automatically switch to heating or cooling mode depending on the temperature set. It has the same heating and cooling power as a standard heater and cooler. If cooling it will exhaust heat just like a cooler, and if heating it will not exhaust anything, just like a heater.
It costs 140 steel to build and 4 components, the combined cost of a cooler and a heater, and uses the same amount of power as a heater or cooler.
It is placed over walls like the coolers and vents featured in In-wall coolers and vents and Replace Stuff, so the wall you place it over will not be deconstructed.