屋顶通风doesn’t decrease AC load
马丁，在精美的房屋建筑，您写道，屋顶排气不会减少空调负荷（http://www.finehomebuilding.com/2017/07/11/ford-venting-doesnt-aft-cooling-cooling-loads#comment-13202).
Which leads me to ask what roof venting IS good for. Humidity control? Presumably, venting doesn’t increase heating load in the winter.
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Replies
答对了！
Robert,
您应该阅读GBA文章标题为All About Attic Venting.
In that article, I wrote:
“这是人们建议解释排气阁楼实践的四个最常见的原因：
•减少阁楼上的水分堆积的机会，或在屋顶护套的底面上凝结。
• To make roofing shingles last longer.
• To lower cooling bills during the summer.
• To reduce the chance of ice dams.
Although attic ventilation is sometimes able to contribute in a very small way to addressing the problems on this list, there are much better solutions to all four problems than ventilation."
有关这些句子背后的推理的完整解释，请阅读文章。
屋顶通风does decrease AC load, in some houses by a lot actually. Those solar attic fans are amazing.
Have you ever been to a room that is closed off for ages? Your attic/house will smell and feel like that if it's not vented.
Anon3:: Really? Show me the data!
A review the published literature of actual measurements shows attic venting in hot climates usually increases cooling energy use (with but a few exceptional cases to prove the rule.):
http://www.fsec.ucf.edu/en/publications/pdf/fsec-cr-1496-05.pdf
Best case with one of those "amazing" solar fans is yields only a low single digit percentage in energy savings:
http://www.fsec.ucf.edu/en/publications/html/FSEC-GP-171-00/
Show the data? I installed one recently, the difference it made was huge. I should have gotten the bigger version in hindsight. Oh well, on my next house I'll get the bigger version.
阁楼风扇如何有所作为anon3？明智的感觉还是使用的能量的差异？
The AC would struggle when it's 90f outside. With the solar fan, it's now fine into 100f. I was getting massive radiant heat before, now it's mostly gone.
请注意，这是一所较旧的房子。
anon3，
I've asked you before: Can you tell us your name? And perhaps you can tell us whether you work for a product distributor? Many of your posts seem to promote one or two products.
The精美的房屋建筑罗伯特·范卡瑟（Robert Fankhauser）在他最初的问题中提到的专栏涉及大教堂的天花板。任何试图在大教堂天花板的通风通道中安装太阳能阁楼风扇的人都是坚果。这样的风扇无疑会通过天花板裂缝将室内空气吸入通风通道，从而提高房屋的能源费用。
Anon3显然提出了一个新主题，涉及阁楼，而不是大教堂的天花板。
Suffice it to say that solar-powered attic fans have the potential to cause more problems than they solve. They can occasionally be useful, but only in attics that (a) have insufficient insulation, (b) have ductwork located in the attic, and (c) have a very, very airtight ceiling. Such homes are rare.
If you have an older home with insufficient insulation and ductwork in the attic, the solution to your problem is (a) perform air sealing work on the attic floor; (b) seal duct seams; (c) improve duct insulation, if possible, and (d) add more R-value to the existing attic insulation.
If you have a big bank account, an even better solution is to convert the vented unconditioned attic into an unvented conditioned attic.
The steps I have described make much more sense than installing a powered attic ventilator.
Dude I should have installed the attic fan years ago, but thanks to forum like this I was mislead. Oh well, you learn something everyday.
There's another benefit, the incredibly nasty attic air is now almost fresh smelling!
Anon,
除非闻起来弥漫在下面的房屋中，否则您的阁楼空气闻起来有什么区别？在其他线程中，您建议阁楼风扇会使整个房子变得更好，但是如果阁楼空气在下面引起气味，则解决方案是空气密封的天花板，而不是通过泄漏到阁楼上的室内空气。
I wish you would engage in some discussion of the advice you suggest, rather than moving on to a different discussion and just repeating. If you are right, that's how you could convince us. Just making an assertion and leaving it hanging doesn't do that.
我不明白ANON3没有被禁止。他始终发表矛盾的帖子，这些帖子令人困惑和不正确。我敢肯定，您可以处理16美元的打击，以提高内容的质量和一致性。他不想张贴名字有几个原因。巨魔对帮助他人没有兴趣，而是要娱乐自己。我还没有找到一个巨魔，它不是藏在互联网匿名后面的胆小鬼。他会在这篇文章中微笑，因为他知道他是某人的职位，但我希望这是他可以写的最后一篇文章。
埃里克（Eric）：这个论坛不是（也不应该）促进对某些正统观念的同质思考。只要参与者愿意支持除了更不受支持的断言以外的其他事情，就可以进行现实世界的情况进行剖析和分析，这是有用的。
Dana,
如您所知，只要评论部分没有用来侮辱其他读者或作者的个性，我从来没有遇到过矛盾的意见的问题。
但是，当经常的海报显示促销产品的迹象时，似乎无法用有效数据备份断言，Web论坛管理员只要求有问题的人来识别自己，并让我们知道这些是否合理产品建议是出于商业利益的动机。如果这样的人拒绝识别自己，那么网站管理员的权利将是阻止未来评论的权利。
我希望无需纠正压力差的空气密封（通常在夏季阁楼 - >内部）会减少但不会停止气味的运动。
我的区别在于那些询问的人和那些回答的问题。如果向来这里的人们提供的信息不正确，那么论坛将失去对我们所有人的有用性。