I have a 2 story house with an open starcase. The bottom floor is always cool and but the top floor is always a bit harder to keep cool. Recent 100+ temps have caused the second floor to stay warmer for longer. Second story unit runs constantly to keep the second floor cold.
My heat load on the second floor is high due to heat rising as in most houses there are no doors to stop the airflow.
The first story unit is oversized and cools the house quickly -- 20 degree drop
The second story unit is slightly oversized and working fine - 17 to 20 degree drop.
So can I fix my issues with something other than a new unit???
Any thoughts on these ideas?
1 -- Add or move first floor return to the middle or top of the staircase? The thought is that I would pull the hot rising air back down to the first floor unit.
2 --Place a duct in the staircase from the first floor unit? I guess a large one? Second floor return is at the very top of the staircase
3 solar attic fans remove heat from the attic not a house fan.
4 Install a ceiling fan in the staircase.
5 add a portable A/C unit for master bedroom