Yep, we humans need air -- and not just to breathe.  We like fresh air that's moving around and isn't stagnate.  That's why you need to keep your home's vents and air return registers clear of obstacles.  Because if they're hidden behind chairs or under rugs, your heating & cooling system's fan must work harder and you'll use more energy trying to heat or cool your home.  Nice job, Divine Providence!

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