I have a two-car attached garage. The door leading into the house from the garage is located in a hallway separating the family room and garage. The hallway is approx 20ft in length. The garage has two vents located on the same wall, both identical in size and both about a foot from the ground. The family room is always about 10 degrees cooler than the rest of the house. Since we don't park our cars in the garage, would it be possible to seal off the vents to minimize the cold air leaking into the family room? I am afraid that if its like this in the winter than the family room might be much warmer in the summer, especially since the thermostat is located in the family room. Your advice is greatly appreciateed.