We have a similar issue in our house.
To avoid hot from 1st floor rof.
Remember all these are minimalist and eco friendly approach to relieve from hot climate.
High temperature during night is not due to atmosphere but the heat radiation from the ceiling that stores all the heat.
Hot air doesn t just rise it actually seeks out colder environments.
Department of energy the surface of a cool roof reflects more sunlight and releases more heat than a so called hot or dark roof.
Keep your blinds closed.
1 put a rubber coating on the top of the roof rubber is an excellent insulator.
The way i see it you have 2 options that will help.
You can even air seal your attic to prevent heat from seeping in.
Painting the roof white will not help during the evening after the sun goes down.
Reduce use of lights and appliances avoid generating additional heat upstairs.
If the upstairs floors have few windows and a lot of hallway space between fenestrations the whole floor s airflow can suffer.
As simple as this tip may seem family handyman notes that up to 30 percent of unwanted heat comes from your windows and utilizing shades curtains and the like can save you up to 7 percent on bills and lower indoor temperatures by up to 20 degrees.
A cool roof is a roof designed to maintain a lower surface temperature in bright sunshine than a traditional roof source.
The less common answer but just as critical as the first one.
In other words closing the blinds essentially prevents your home from becoming a miniature greenhouse which is.
Heat seeks out cold.
While the term cool roof is sometimes used to describe any roofing surface that is cooler than a standard rooftop green certification.
2 add a lower ceiling with insulation material in between the existing roof and new ceiling.