If I remember correctly, when using a HP, the evap coil is on the return side of the blower? So as to act like a draw-thru?
If so, why is this? Perhaps so that it doesn't get affected by aux heat?
Secondly, If someone wanted to just use a HP as only AC, using a gas furnace as the primary heat source, would the evap coil then go on the supply side of the furnace? Disabling the HP function.
Just researching options