coop sq.footage is 5'x4'... right now the only ventilation holes our coop has are two rectangular vents about 4"x8" on the north and south sides of the house (east and west sides are roofed - it's an a-frame). the vents are about 12-18" higher than the highest place they could (and probably will) roost - the top of their nest boxes. i was thinking that it could get chilly with drafts blowing through in the winter. have you guys seen those clear plexiglass heat-duct covers for the in-the-floor heat vents in your house? they're covered at an angle, to blow heat from your furnace in a particular direction. i was thinking of having dh screw a couple of those over the vents, with the open section facing downwards... does that make sense? and if yes, do you think it would be worth doing? or should i just install some higher vents (at the top along the roofline), and make some hinged or sliding covers for the lower vents? i'll try and get pics and post later...... thanks in advance!