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New shorter furnace and what to do with the extra space...
New furnaces I am looking at are 12 inches shorter than my existing furnace. I have the option to raise the new furnace on a box (plenum?), or insert a piece of duct-work (plenum?) between the new furnace and the A/C unit that sat on top of the existing furnace.
Does one have benefits over the other?
Here are some drawings that may help explain. White is the new furnace, blue is the A/C unit, dark grey represents a new part of ducting, yellow/beige are the existing duct-work. Thanks for any replies.