I am installing a new gas upflow furnace which has an existing cased coil above the old furnace. The new furnace is shorter than the old one. I am looking for advice on how to remove the old furnace without damaging or disconnecting the cased coil. Do I need to lift the cased coil to get it above the lip on the furnace? The cased coil is actually wider than the existing furnace. My plan is to raise the new furnace off the ground the 12 inches to make up the difference in furnace sizes and relocate the filter housing up to the height of the new furnace. Any advice would be appreciated.