Hypothermia!
Power cost is rather crazy to keep it that cold with doors open to the outside world, but as you can see, it's very effective. Though, Scythers are too fast to freeze at this level of cold, but they're easy enough to kill through other means.
Also, have you ever wondered what would happen if mechanoids could get back up after losing their weapons? Well you can totally do that by shutting the coolers off before they die, though I wouldn't recommend it. They wander around (semi) harmlessly, though they'll break any doors laying around and will punch colonists in the face if they get too close.
Note: Should you want to try this, keep in mind that the outside temperature drastically affects how effective the coolers are in this setup -- The map I made this in generally ranges from -10 to 10C, which makes the temp range from -110 to -90. So colder maps have it easier with freezing mechs, and hotter maps have it harder. Also, there's a turret placed to the left of the maze that is covered by the health menu, to give raiders/mechs something to target rather than deciding to poke my wind turbines.
Power cost is rather crazy to keep it that cold with doors open to the outside world, but as you can see, it's very effective. Though, Scythers are too fast to freeze at this level of cold, but they're easy enough to kill through other means.
Also, have you ever wondered what would happen if mechanoids could get back up after losing their weapons? Well you can totally do that by shutting the coolers off before they die, though I wouldn't recommend it. They wander around (semi) harmlessly, though they'll break any doors laying around and will punch colonists in the face if they get too close.
Note: Should you want to try this, keep in mind that the outside temperature drastically affects how effective the coolers are in this setup -- The map I made this in generally ranges from -10 to 10C, which makes the temp range from -110 to -90. So colder maps have it easier with freezing mechs, and hotter maps have it harder. Also, there's a turret placed to the left of the maze that is covered by the health menu, to give raiders/mechs something to target rather than deciding to poke my wind turbines.