On Jun 21, 12:31*pm, "John Grabowski" 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.

*This topic has been mentioned here a few times. *More insulation, an attic
exhaust fan, reconfiguring your ducts, adjusting your vents, or adding
another zone could all help to one degree (No pun intended) or another.

To the above list, I'd add:

Check all the existing ducts and returns. It's not unusual for
joints to be made and held together with duct tape, which dries out,
then the ducts become disconnected or have major leaks.

Make sure there are enough return air vents upstairs. Many times,
you can just cut a bigger opening in the wall and use a bigger grill,
which can improve air flow. Sometimes, with minimal work, you can add
returns too.

There are booster fans available which can go either as hardwired in a
duct that feeds the upstairs, or plug-in type that sit over the
register and have built-in sensor that turns it on when it detects air
flow.

If none of the above is enough, a ductless mini-split system may also
be appropriate