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

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What do you mean by this? A 15-20 degree drop from return to air vents? I understand that, but I don't have a thermometer to reliably measure that right now. But the reality is the thermostat reads 80-82 at hottest parts of the day.

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You can get a $30 infrared thermometer from the hardware store to shoot at your vents. The air should be coming out of them 15-20 degrees cooler than the ambient air. So if your thermostat is set at 72 and your inside air temp is about 72, then the vents closest to the inside HVAC system will have air coming out 52-57 degrees usually.

ETA: If its 82 inside your home, the air should be coming out of your vents at 62-67 degrees.

The blower is a good point, but if that's the issue I'd think you'd potentially be icing up. IDK.

The roof very well could be the issue, idk. But it seems like maybe you have an HVAC issue also, and the roof is just making it worse?

If you have just decent insulation, the attic heat should not be THAT much of an issue. I can see it causing it to not get down under say 72 or 74 degrees during the day. But staying at 80*+ IMO is not just a new roof issue.