#Storm windows r value during winter keygen#
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What's happening around your windows and doors during all this stacking and reverse stacking? Not a lot, by comparison. This is why your attic gets dangerously hot in July and August! Hot air from the outdoors enters the home through the top and sinking cool air leaves it through the bottom. That's why we call it the reverse stack effect.
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The warmer air rises and eventually makes its way out of your home. Cool air from the outdoors is pulled inside. During winter, the warm air produced by your furnace escapes through your attic. It's all about air pressure.Ĭonsider how air enters and leaves your home. But when you add up all the air leaks above and below you, leakage around windows and doors almost never comes close. Replacing your windows? Not so much.Īren't there gaps around your windows and doors, too? Definitely. In other words, plugging the holes in your attic and crawlspace is a much more effective investment in energy efficiency. The most significant pressure differences are at the top and bottom of a structure - not the sides.When air leaks out of your home (positive pressure), an equal amount of it enters your home from the outside (negative pressure).Most of these are located in your attic and - if you have one - your crawlspace. Conditioned air leaks out of unsealed gaps and cracks in your home's envelope.Energy efficiency improvements start with what's above and below you, not with your windows. Feeling the stretch in your neck yet? Ok, good. To figure out why your energy bills are so high (and why your home is so uncomfortable at certain times of year), look up at your ceiling. There are much bigger holes to plug, and you should take care of those first. How could that be? Aren't old, drafty windows the weakest link between the great outdoors and the conditioned indoors? It might seem that way - especially when you feel cold air coming through a drafty window in winter or feel heat penetrating the glass on a hot summer day.īut in most homes, windows are rarely the biggest sources of air leakage. Unfortunately, replacing your windows probably won't lower your overall energy consumption. Ever thought about replacing your windows to save energy? A lot of homeowners have, and many of them drop thousands of dollars on the latest and (supposedly) most energy efficient replacement windows in an attempt to save money on their utility bills.