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A tighter built home means less outside air infiltrating in the home, which in turn means less oxygen to use for combustion within the furnace. As the furnace burns fuel and oxygen for combustion, it "eats up" the nearby air, which has to be "made up" with fresh air. If air cannot type in the home as quickly anymore, this could cause serious issues. As the surrounding air can be used for combustion, and not substituted for fresh air, a bad pressure in the space can take place. This could create combustion trouble for the furnace, plus consume fresh air for any person inside home. I've a weight problem my life. My parents bought me "huskies" while I would definitely grammar school. I wasn't an extremely active kid. My parents always provided 3 good meals to me daily. School lunches were actually nutritious in those days. They weren't anything like now with pizza, tacos, hamburgers, hotdogs, chips, sweet sodas and all sorts of types of chips and desserts. I hear french fries include the main course especially with school girls. Today's kids don't have a chance.