On 18 Jun, 13:44, "HotRdd" wrote:
-- I open the door that contains the furnace filter this grabs the
cool air
-- from downstairs and pushes it upstairs, most days we don't even
need to run
-- the air just the furnace blower.

Thanks, but there is no door on this unit. I know what you mean
though...my old furnace had a door on the compartment that housed the
blower and filter.

On my new unit, the filter just slips into a slot in the ductwork just
before the blower. If any basement air is going to be sucked into the
system via the filter opening, it's already happening.