re: Ways to keep house cool while waiting to repair AC situation.

We are missing important information to help figure out your problem.

How long have you lived in this house? Has there always been a problem cooling the upstairs or is this a new problem? Has anything changed the would affect cooling load ... such as shade tree now gone? Did the cooling problem start after installing the new roof? Are you sure the "felt paper" and plywood were cut so that the opening under the roof vents allows good flow?

What size is the upstairs A/C unit and how many square feet up stairs? What type A/C filter are you using and are you using something different now? Have the coils in the attic and outside unit been cleaned in the past year?

Have you replace any part of your A/C system that might be causing your cooling problem? Is the air flow coming out good at each vent and is the air cool? Air temperature should be 60 F or less.