Check your local building codes.
Where I am there are minimum and maximum fenestration/square footage ratios that are tied directly to energy consumption.
There are different types of glazing systems that are part of this overall equation.
There are also code requirements regarding egress that take into account a minimum opening size, how the windows operate and what room they're in.
Its not as simple as it may seem.
When I die, I want to go peacefully like my grandfather did — in his
sleep. Not yelling and screaming like the passengers in his car.