So recently I overheard one my friends talking to another person saying, you really need to take that air conditioning unit out of your window it's causing your light bill to go up, so I was curious, does having a air conditioning window unit cause your light bill to go up significantly?

Your electricity bill will go up since it draws power. Case closed :) 

Edited August 29, 201411 yr by ineseri

Your electricity bill will go up since it draws power. Case closed :) 

Thank you based Detective.

my faimly's Central air conditioning system broke and we didnt have enough money to replace it, so we just got 2 AC window units, its just as good and our electric bill went down by about $250   i did expect the bill to go up but nah son i think you're good

As ini said, your power bill goes up if you have an A/C unit; individual window units don't draw anywhere near as much as a centralized unit (for obvious reasons, because they're cooling a room instead of a building), but A/C in general is typically one of the largest uses of power in a house in the summer.

However, if the question is about putting it in a window versus, say, in the middle of the room: A typical A/C unit in the middle of a room draws the same amount of power (if not more, it may well draw more) while heating the room. The reason they're put in the window in the first place is because they need somewhere to transfer heat in the room; this is most often transferred to air outside (in a window unit, right outside, which is why it sticks out the window; in some portable units, it draws air from the room but exhausts it to the outside through a hose; they make units which use evaporating water to cool the room, but the exhaust from that is very humid and you likely don't want it exhausting inside).

Okay so I think I get it now, the window unit does make your bill go up, by not by a lot like a $100 or something.

Okay so I think I get it now, the window unit does make your bill go up, by not by a lot like a $100 or something.

Well its running off electricity so its just another thing in your house drawing power. As with central air it all depends on how much you run it. As others have said it doesn't cost no where near as much as central air. I had one in my first house at college in the window in my room and I honestly don't remember there being any sort of noticeable difference on my bill. If you use it every single day all day long you may see a slight increase but no I would be pretty confident saying it shouldn't be $100