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When we had that setup on our 2010 we put black foam board behind them in the summer, but took them out in the winter to let the full return air flow to the furnace pass thru. Never had a cold air flow issue. If the air is really flowing, I'd try and determine where it's getting into the basement area and stop it there.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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