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I agree with you completely. Having HVAC in my blood and having a 2020 4811ms Montana, there should be a return duct and filter grill at the stairs for complete HVAC recirculation. This would be more energy saving and efficient imo.
The area around the furnace is around 45deg f and that's the air being circulated over the heat exchanger. With a 50 temp rise that's 95 deg supply air temp out the registers. It's not circulating room temp it's circulating basement area temp. Now if it were circulating room temp at say 70 deg F with a 50deg TR, ( my unit has a 50deg f temp rise) that would give you a 120 supply air temp out the registers. 120 very 95. See how much quicker you will maintain and hold a 70deg set point. If I could fit in there I would install a return duct to the stairs and restrict return air flow not needed. But that's me. I winter camp and propane and electric has become a factor. 😁✌️ Happy Camping
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