Exhaust Fan

what is more effective to keep my attic roofcooler exhaust fan or radiant barrier foils?

have a big problem with heat build up in my attic and my 2nd floor is always hot when it is sunny and on rainy days its okay . So i know it the heat build up in the roof. So would it be cooler installing a roof exhaust fan or installing radiant barrier foils ?

You need to look at the ventilation before you do anything else. Most attics ventilate by convection. Hot air exits through ridge vents, gable vents, etc., which allows cooler air to be drawn up through the soffit vents (under the eaves). If you have a gable roof you can have a fan installed in one gable that will pull air through from the other gable. If you don't have a gable roof you need to be sure you add enough exit ventilation. You can do that by having a roofer install ridge vents or turbines, which are considered passive. Or, you can have a powered ventilator or two installed which will pull air up out of the attic. Those are active systems. Either way, you've got to have enough fresh air entering the attic to replace what's being drawn out. That's what causes the cooling. BTW, in the winter the ventilation should not be blocked because that's what keeps moisture from building up in the attic and insulation.

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