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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. 5. The concentration of their language Despite being often considered as mercenaries by the other characters within the show, the A-Team always acted assisting good and helped the oppressed. The show ran for five seasons around the NBC television network, from January 23, 1983 to December 30, 1986 (with one additional, previously unbroadcast episode shown on March 8, 1987), for a total of 98 episodes.