Should i ventilate the attic when the airconditioner is running to cool of the downstairs?

Question

This is a one hundred year old three story house. It has insulation in the walls up to where the attic starts. No attic floor insulation. Attic ceiling is A frame peak with insulation in the sealing. No attic vents, so I put the fan in the window to blow out the hot air. Close the attic door and turn on the whole house airconditioner which really is only effective on the first floor with a little effect in one bedroom.

Answer 1

Yeah, if you can keep the air moving in the attic, it should make things a little easier on the a/c.  You might want to close off the second floor, too, and just use a window a/c at night.

Answer 2

Don't exactly understand the details in the question.  What you want to achieve is the lowest possible temperature in the areas adjacent to the cooled area.  Heat is the enemy so let air flow through the attic as long as the attic is not designed to be cooled by the AC.

Answer 3

you are better off ventilating the attic, not only will it help keep your house cooler, it will also extend the life of your shingles