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On its own, digital telephone service sounds pretty appealing: unlimited calls, cheaper phone bills, great features and much more. But along with a youtube video phone, digital voice service looks amazing. Video phones let users see the other person in lieu of simply hearing one another?s voice on the line. Though it may seem, or look, too good to be true, most analysts agree that video phones will probably be within the majority of households within the near future. 4. The number of arguments they make 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.