Not really proven. It's theorized to be possible, but nothing emits cold that we know of in the same way. Microwaves, use waves (citation needed) to heat up the food, cold to our know doesn't work the same way.

I don’t know if it’s a stupid question or not but I have been wondering this myself for years. :)

Given how much about science we still have to learn, I would say it is a distinct possibility. If you want something cheap and easy to use like a microwave to do this though, I highly doubt we'd see that possible for the next 30-40 years at minimum.

'projecting' energy is kinda easy... 'sucking' energy is difficult

https://youtu.be/MHm3fHVZitI?si=mkUIGlaqUUt2NPKs

Furze did it... kinda

i would think not. unless waves can be tuned to cancel out background radiation, but that would only stop it from heating up more.

https://m.youtube.com/watch?v=Cb_s_8aEVuQ

They trial'd something similar on the snowpeircer train instead of treats like ice cream for good behaviour they froze your arm off for being naughty lol

It's a good job they didn't have that when I was at school because I'd be just a head and torso now lol

Besides freezers I don’t think there’s any technology we know that could do this on a wide range of substances. But freezers are neat - they move heat from the inside to the outside and as they are insulated they can reach temperatures 40-50 degrees (Celsius) under their surroundings

I've been wondering this for my entire life