High temperature during night is not due to atmosphere but the heat radiation from the ceiling that stores all the heat.
To avoid hot from 1st floor rof.
You can even air seal your attic to prevent heat from seeping in.
Department of energy the surface of a cool roof reflects more sunlight and releases more heat than a so called hot or dark roof.
Hot air doesn t just rise it actually seeks out colder environments.
Reduce use of lights and appliances avoid generating additional heat upstairs.
A cool roof is a roof designed to maintain a lower surface temperature in bright sunshine than a traditional roof source.
1 put a rubber coating on the top of the roof rubber is an excellent insulator.
2 add a lower ceiling with insulation material in between the existing roof and new ceiling.
Add extra insulation to your roof and attic.
The less common answer but just as critical as the first one.
While the term cool roof is sometimes used to describe any roofing surface that is cooler than a standard rooftop green certification.
Remember all these are minimalist and eco friendly approach to relieve from hot climate.
Keep your blinds closed.
Painting the roof white will not help during the evening after the sun goes down.
Also adding an attic fan will help cool things down by circulating the air up there and decreasing the amount of hot air reaching your second floor.
It s actually the second law of thermodynamics.
If the upstairs floors have few windows and a lot of hallway space between fenestrations the whole floor s airflow can suffer.
In other words closing the blinds essentially prevents your home from becoming a miniature greenhouse which is.
We have a similar issue in our house.