| The first thing I would try would be to
Make sure all the vents upstairs were open all the way.
Then go down stairs and close all the vents half way.
That should force more air upstairs to help with the higher heat load.
Then if it helps but not quite enough, try closing the downstairs registers
two thirds of the way.
Basically you are trying to divert more cool air to overcome the additional heat load upstairs.
Don't expect to check it 5 minutes later and notice a difference.
Wait a day then see how it is.
If that doesn't help , You may consider having an additional return vent installed upstairs in the hall ceiling. |