I’m going to install two new gas furnaces in a 75 yr old duplex of mine. (1000sf each apartment)The existing furnace (1) has a shared COLD air return three stud bays wide for the upper and the lower pats. For the new installation for the lower apt., my HVAC man is going to use the existing HOT air supplies as COLD air returns(all on inside walls), adding new HOT air supplies under the windows on outside walls. For the new installation in the upper apt. he is going to block off the lower access to the shared Cold air return and use it for the COLD air return and continue to use the existing HOT air supplies. Does this sound like a viable plan? Thanks for sharing your advice
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