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Flickr: Jason Bache: Of these, you can also use the Windows Classic theme to set the Start menu and taskbar back to a good old Windows XP default look, should you get bored of all the pretty pictures and artistic touches. Also, remember that Windows 7 Starter and Home Basic will not come with these features. Not that this should be a problem for 99.9% of all users. 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.