Are there resources for determining what percentage of the earth's surface is occupied by air conditioned spaces? EDIT: My goal with this question was to better understand the impact of cooling systems on local urban environments, but its been pointed out I am asking the incorrect questions for the answer's Im looking for. So this can be disregarded, but I'm not deleting as deleting questions seems to be frowned upon.

I am exploring some ideas regarding the impact of urbanization on the climate and our environment. My basic thought process is that the vast majority of homes and work places have some form of air conditioning(I understand many parts of the world dont, but from estimates I saw the global average is still quite high). And as I understand it air conditioning functions to displace heat(and slight heat generation from the energy usage). Like putting a brick in a bucket causes the water level to rise so too does the outside heat level rise when the heat from inside buildings is displaced.

What I am looking to find out is if there is a way to determine what percentage of the planet's land surface is covered by buildings occupied by humans to determine what percentage of the world is displacing heat from the inside of those buildings(and the area that space occupies) to outside(all the other area)

I understand not every building has air conditioning and will not being using that figure to make a determination(as my previous post had people suggesting). I am simply looking for a good place to start before adding control variables. 

Does anyone have any resources to find out where one might come by these figures? 

Additionally if someone has a possibly better method to find out the information I'm looking for I would love suggestions.
I would dispute the idea that the "vast majority" of the world's buildings have air con; in fact, considering that a large proportion of the world's buildings are either (a) in hitherto cool places; or (b) in undeveloped places, I would imagine that it's probably a minority. But I don't have figures on this.

The main part of the question, though, is about the proportion of the earth's surface that is built on. That could be approached as a GIS exercise, and would be reasonably easy to do in places like the UK that have freely-available maps that show all buildings... and very much harder to do in parts of the world that don't.

This study made an estimate (from various data sources, including nighttime lighting) that about 3% of the Earth's land area is "urban". That certainly doesn't include all buildings, but it also includes urban spaces that are not buildings, so it may serve as a useful first approximation.

Depending on your objective, you might find it more useful to stop thinking specifically about air conditioning and instead ask about heat produced by buildings. All buildings produce heat, whether this is from heating, cooling, or other energy use. As a proxy for this net heat production you could simply look at the buildings' energy consumption.