You could always use a script for this:

function keyclick(key, nkey, modifier, event)
if event == 1 and (modifier%1024 == 1 or modifier%1024 == 2) and nkey == 117 then
sim.ambientAirTemp(tpt.input("Ambient Air Temp", "Enter a new ambient air temperature", "", sim.ambientAirTemp()))
end
end
tpt.register_keypress(keyclick)

Press shift+u and enter a new temperature in Kelvin

If you wanted it to be a button like PROP ... that can be done but the script would be more work.

@tmo97 (View Post)
Probably because it was at 22C and suddenly it's almost 10000C. I think if air did that in real life, there would be lots of explosions :P.