We're about 75% through our renovation project, with the most looming task left is drywalling an upstairs addition. We had an A/C unit installed, and other than grates over the returns and vents, it is completely ready to go. Is there any reason to not run the A/C at this point? It's getting awfully hot and would be nice to have some relief, especially at night. Our contractor said we'd be ok - just not run the A/C while we are sanding the drywall and to replace the filter when all the renovations are complete. Does that sound right to folks out there?