The basement is partially finished with insulation and drywall,
ie: family room, bath, and two bedrooms.
the furnace is locaten in small room in center of basement, is enclosed and drywalled,
except for ceiling, which is open thru two floor joists to the unfinished area.
the unfinished is in the back side of basement with no drywall nor insulation,
and will be storeroom.
the family room in basement does have cold air return direct to furnace.
the main floor cold air returns thru vents in hallway to duct work belo,
which is open at top, so air circulates into unfinished storeroom,
then thru open area between two floor joists into furnace room,
then available to furnace.
Having the furnace room door open should improve circulation,
but then, if that is neccessary, we dont need the door.
I have been told that this is known as wild cat return,
and that it is acceptable in some areas, but then not in some citys.
another told me it would make the air condition system inefficient.
There is also cold air return vent in master bedroom,
this goes into area above floor joists
which is covered by basement ceiling belo,
so I cant see that this return goes anywhere.
Maybe I should mention that this is a heatpump system
with electric backup.
I'm thinkin that this is just a shortcut to save time and costs,
but am really concerned if it effects the effeciency of the system.
thanks for the help.