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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. Unfortunately, about 5 % of those women can have frequent infections. Recurrence has several possible causes -- incomplete treatments for a yeast infection, chronic medical conditions, and medications such as steroids. It may be also something more important entirely, which explains why you must confer with your own doctor whether or not this happens to you.