When you take down the basement walls you will find one duct laying on the floor. Take that one and put down at the back of the tanks pointing towards the valves to help prevent freezing.
As far as keeping cold air in, we put Magnetic register covers over the floor registers.
I have also made covers for the stair vents.
We remove these in the winter for the furnace to work.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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