On Sun, 21 Jun 2009 11:42:26 -0400, Kurt Ullman wrote:
The upstairs is almost always hotter than the downstairs during the
summer. Noticeably hotter. If we get the upstairs comfortable, the
downstairs is like an ice box.
Any suggestions? The house is about 20 years old. Also, I'm trying
to avoid tearing up the roof.

What are you using for cooling? Separate AC systems for each floor?
An evaporative cooler? Only a fan?

What is your climate? Arctic? Tropical? Desert?

Believe it or not, these are factors that are more important than how
old your house is.