Our house is too warm upstairs, downstairs is cool, thermostat is set at 67 degress?

We recently had new windows installed in our 65 yr old house. Its very warm upstairs now and very cool downstairs. We had whole house air conditioning installed 15 years ago and cold air returns were installed at the baseboards of each of our 3 upstairs bedrooms at that time. They open and close and directly above... show more We recently had new windows installed in our 65 yr old house. Its very warm upstairs now and very cool downstairs. We had whole house air conditioning installed 15 years ago and cold air returns were installed at the baseboards of each of our 3 upstairs bedrooms at that time. They open and close and directly above them at the ceiling is a vent. Should the baseboard vents be open or closed? Is there any way to maintain a warmer lower level without SWEATING upstairs?
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