Re: damper adjustment
Even though this sounds like a relatively simple process, I would strongly recommend a professional be brought in to assess the situation.
I cannot overemphasize the importance of proper airflow to the operation and efficiency of your a/c system. As was indicated earlier, if you shut off or attempt to redirect too much air, it can have the opposite effect from what you are trying to achieve, AND can damage the system in a major way.
I would have someone look it over anyway as you should not be getting those types of conditions in the house, i.e. temperatures rising to 82+ degrees. There may be other issues at work, and making adjustments to the dampers or registers may ultimately 'mask' the real problem.
It shouldn't cost you anything to have someone come out and go over your system and make their recommendations based on what they find.
As far as references, ask friends, neighbors, co-workers, fellow church members, for a name or company whom you can trust.
All the best, Irishmist
Live your life as an EXCLAMATION; not an explanation!