Humans evolved in the conditions of 1200ppm CO2 in air and natural greenhouse effect, when all Earth was green from pole to pole, with average temperature around 20°C with very little difference between day and night.winter and summer and along the latitudes. It was a climate of epoch known as eocene that lasted hundreds of millions years until unknown event a dozen million years ago started relatively short and disastrous ice age we living in.

So, we have to use heating and air conditioning to preserve that natural and comfortable conditions of eocene in our houses, because some evil bastartds are actively trying to prevent natural growth of CO2 concentration to normal 1200ppm and greenhose effect as in our distant past, for some evil reason they want out planet stay half-dead and stuck forever in the unfinished ice age.

So, it is absolutely normal to keep 20°C in your home, because it is normal average temperature of Earth. Now we have only around 15°C with huge gradients between day and night, winter and summer, and along the latitudes, because there are no greenhose effect that greattly reduce gradients and stabilise temperature. This is a consequence of last ice age, very short period in comparison with Earth history, and it is absolutely not normal for our planet.

When CO2 will reach 1200ppm, polar ice caps will disappear, deserts become green fields and only then we will not need any AC and heating to feel comfortable in our houses. For now, AC is a forced workaround to create natural eocene climate in separate places.

Humans developed in the conditions of 1200ppm CO2 in air and natural greenhouse effect, when all Earth was green from pole to pole, with average temperature around 20°C with very little difference between day and night.winter and summer and along the latitudes. It was a climate of epoch known as eocene that lasted hundreds of millions years until unknown event a dozen million years ago started relatively short and disastrous ice age we lining in.

So, we have to use heating and air conditioning to preserve that natural and comfortable conditions of eocene in our houses, because some evil bastartds are actively trying to prevent natural growth of CO2 concentration to normal 1200ppm and greenhose effect as in our distant past, for some evil reason they want out planet stay half-dead and stuck forever in the unfinished ice age.

So, it is absolutely normal to keep 20°C in your home, because it is normal average temperature of Earth. Now we have only around 15°C with huge gradients between day and night, winter and summer, and along the latitudes, because there are no greenhose effect that greattly reduce gradients and stabilise temperature. This is a consequence of last ice age, very short period in comparison with Earth history, and it is absolutely not normal for our planet.

When CO2 will reach 1200ppm, polar ice caps will disappear, deserts become green fields and only then we will not need any AC and heating to feel comfortable in our houses. For now, AC is a forced workaround to create natural eocene climate in separate places.