Try ARAY - or maybe subframe CRAY to quickly create and delete 22C parts.

I think very good and easy idea is to just use sparked PSCN. When PSCN is sparked, it will quickly cool down and stay at 25 - 40C.

(It's a bit long. Sorry) This probably isn't what you're looking for, but if you really wanted to, you could use the lua console commands for ambient temp themselves...

You could use either:

sim.ambientHeat(x1,x2,y1,y2,Temp)

This will overwrite ambient air temperature in the rectangle from the coordinates (x1,y1) to (x2,y2) with the given temperature. It has to be in Kelvin though.

sim.ambientAirTemp(Temp)

This will adjust the temperature of the 'air' that flows in from the edges of the screen. It won't immediately make any difference on anything in the simulation, but if you want to cool something down fast in 'natural' way, this is how you'd do it. This temperature also has to be in Kelvin.

Its also worth noting that the sim.ambientAirTemp command is NOT constrained by the by the standard temperature limits in TPT (or the universe, for that matter!). You can set temperatures well above 10000K, and well below 0K. -- THERE IS NO TEMPERATURE CAP --

While actual particles in the path of the ambient heat won't pass the limits, they will heat/cool far faster than normal.

If you're just looking for fun after all that, try this:

Open a city save, and type in the console sim.ambientAirTemp(100000)

The city will liquify.

------

Reload. Type sim.ambientAirTemp(100000000)

The city will vaporize, then get ripped apart by the pressure created from the ambient air.

-----

Reload... Open the Console...

Type: sim.ambientAirTemp(10000000000000000000000000000000000000000000000)

1. Yes, the game will let you do that.
2. The ambient temp indicator in the top right will two things: 
   1. It will first read "inf C". The game thinks the temperature is infinite and acts accordingly. 
   2. The next frame, the temperature will read "nan C" (that is possible). The air gets so hot that it loops back around to cold, and the entire city will freeze to -273.15C, while still melting at max temp around the edges.

At that point, everything pretty much falls apart, but hey, who doesn't love utter destruction?

(Back to your original question, setting ambient temp to (250) would be equivalent to around -20 C, and should cool down your VIBR nicely! If you create an INSL box that can open/close, then you can expose your alloy to the frigid breeze, then seal it up tight when you have a temp you like.)

There are heaters in jacob1's mod, but there is also a cooler which will always be at 0K, but if you place it right, it will not get in the way, but also prevent a meltdown.