[eru]

> We'll break even in terms of costs within 4 years.

That means a loan of up to 25% interest could have financed the solar panels. Are interest rates higher than that for your parents?

> The increase in productivity is massive. I no longer have to deal with heat when I go home. > Now imagine this happening for billions of people living in tropical climates

For what it's worth, the GDP per capita of Singapore used to track the introduction of air conditioning. Not sure what's cause and what's effect, or coincidence.