In my ignorance, I always thought that the world spends more energy heating than cooling. All the western world use house heating almost 7-8 months(at least in my understanding) than heating it. 

So my ignorance is what makes my world! What I know and believe may not be the truth. 

All these thoughts came from watching this interesting video:

Further from this video, I wanted to know how magnetocaloric cooling works

1) Here an old 2014 explanation of the science

2) A working cooling system

More information in the Wikipedia

Another interesting reading from Gardian(which have an indication of my earlier ignorance was not out of nowhere haha)