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A tighter built home means less outside air infiltrating in the home, which means less oxygen to use for combustion within the furnace. As the furnace burns fuel and oxygen for combustion, it "eats up" surrounding air, which has to be "made up" with fresh air. If air cannot type in the home as easily anymore, this can cause serious issues. As the surrounding air is utilized for combustion, rather than substituted with oxygen, a negative pressure inside the space can happen. This could create combustion problems for the furnace, plus burn up fresh air for anybody inside the home. Let me begin with saying I?ve never been a Michael Moore fan. Being a libertarian Conservative all of my voting life, I?ve for ages been in opposition to ?Socialized? medicine. However, firsthand expertise in the healthcare business the past 17 years indicates me our system of health care (comparable to our tax system and education system) is broken beyond repair.