try to put louves grill with mesh wire on it, it should improve cross air ventilation

you see, after rain, the upper floor cool down a lot but the lower floor at the center of the house still warm like Oven.

If I install Wind Turbine, I think most probably the wind turbine able to cool down upper floor due to better ventilation at upper floor.
This is similar to circumstance where the upper floor cool down a lot after heavy rain.
But the ground floor at the center of the house still warm like Oven.

So I guess wind turbine only solve the heat problem on top floor and not the ground floor for a double storey terrace house.

theoretically hot air is supposed to rise (through stairway) and the turbine would facilitate it. you may need a couple of turbines.
not sure your house condition.
if not draw hot air upward, then draw it side ways. like do you block the ventilation at the kitchen/back of house. for air replacement there shall be in one side and out another side. or try use the portable fan first if you have.

Usually the lower floors are cool like most condos as they do not get very much direct sunlight.
Active air ventilation (holistic solution) may involve using a KDK exhaust fan or two to suck out the air perhaps at the back. And in the house, use KDK wall fan to funnel the air thru from the front. Why KDK? Their blade tech is superior, wall fan really produce a moving 'tube' of air rather than just random blowing all over.

When you have active airflow it doesn't allow enough time for the air inside ur home to be heated thru IR radiation. The indoor air is changed fast enough. If the air is tupperwared/static, and has noplace to escape to..it warms up.

Effective understanding of all three radiation, convection, and conduction methods of heat transfer in planning your active/passive cooling strategy will work better.

This post has been edited by ceo684: May 18 2021, 01:15 PM

Exhaust fan is important for ventilation purpose esp for intermediate terrace.

My kitchen and bathroom wall exhaust fan is on daily from sunrise to sunset plus all upstairs rooms and hall are also install with ceiling exhaust.

Do not leave the front door and window wide open on a hot day as more hot air will enter the house.