First of all - yes, AC heats up outside as much as it cools down inside. But the temperatures get equalised over time (the moment you open windows, or hot air g

First of all - yes, AC heats up outside as much as it cools down inside. But the temperatures get equalised over time (the moment you open windows, or hot air gets back in through poor insulation), so the overall balance is exactly zero. But more importantly, even if we put all the energy produced by humanity into space heaters, we wouldn't be able to increase the planet's temperature by any measurable amount. To give you a sense of perspective - Humanity produces 4 TW of electricity on average at any given moment. Sun delivers at that same moment 170,000 TW of energy.