Marge, Can You Set the Oven to 'Cold'?

Back in the Midwest, where the summers are so hot and humid that, in the words of Bill Bryson, "you don't sweat sweat, you sweat oil"; where my one fashionista classmate wondered what the prehistoric Indians did during the summer since they didn't have air conditioning; and where the apartments I lived in had only unreliable window A/C units, I wondered to another classmate about the effect on A/C heat output on weather.

It's known that cities can affect weather because of urban heat effects. My question was much more small-scale, both in terms of development and human density, to wit: does A/C contribute in any significant way to the intensity and/or duration of hot spells? My reasoning is that, 1., A/C operates by moving heat from inside to outside, and 2., A/C units generate their own waste heat in addition to the inside heat they move outside.

We never reached an answer, mainly because we didn't have data or know anything about atmospheric heat dissipation. But it seems that I wasn't totally insane to wonder about it in the first place.