New Furnace & Plenum Install Question
I recently removed an old (25 yrs) gas up-flow single stage furnace. The furnace sat on a very firm plenum base with a side opening return and this base raised the unit about 24 inches from the ground. There was an evaporator coil mounted in the standard top of furnace position. The plenum base set-up seem to be moderately lacking some efficiency and filtering in its design.
Will it make much of a difference if I install the new furnace on the floor and place a 24 inch plenum to connect the evaporator coil to the new furnaces heat exchanger top opening? I am basically eliminating the old furnace base type install and substituting a plenum on top to make up the distance. I am not in a position to move the coil and I really did not want to go back to the plenum base design.
Suggestions / Opinions please...