I have a walkout so we getlots of light but it's still chilly. I basically have a 3 story house so what I do in the winter is close all the floor vents upstairs, close 80% on the middle floor and leave all of them open in the basement (then I do the reverese in the summer). This forces heat in the basement and since hot air rises the whole house gets heated. In the morning when the furnace kicks in the basement is quite toasty!

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