Humidifier with a flash-and-batt house?
你好。我们正在弗吉尼亚建造一所房子，外墙的建设是：硬嘴，Tyvek，OSB，1英寸闭孔喷雾泡沫，牛皮纸面临R19 BATT和干墙。
Our HVAC contractor is not installing the humidifier as he says tight homes don’t need them. His comment was we might be calling him to install a Dehumidifier in all probability.
真的吗？
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答复
我同意，紧张的家园不太可能需要加湿器，更有可能需要良好的通风系统来维持室内空气质量。他安装通风是什么？
I do not think that flash-and-batt insulation means the house will automatically be tight. If you want to build tight, there are quite a few things that need air-sealing attention in addition to the exterior walls.
我们的房子有2个单位。一个在无条件的阁楼中，是热泵和AC，并将得到一个ERV。该系统提供我们的二楼，拥有所有卧室。
地下室中的第二单元具有天然气炉。这将提供我们的地下室和主要层面。他说，由于我们的厨房排气有一个相关的空气，因此没有必要在本机上通风，并在开启或关闭时，将进气量打开并关闭阻尼器。
Susan,
Your HVAC contractor gets a big thumbs-up for giving you excellent advice about humidifiers. Humidifiers are dangerous. The use of humidifiers is associated with wall rot.
Your HVAC contractor gets a big thumbs-down for installing an air handler and other equipment in an unconditioned attic. That equipment should have been installed inside of your home's thermal envelope. For more information on this issue, see创造一个有条件的阁楼.
马丁，也许在阁楼安装上一个小拇指，它是近100％的时间完成的。
What needs to be done is someone has to post the exact install cost difference to install the upper system in conditioned space. Then know the added savings in utility costs.
Guesses...
Conditioned install add $6,000
每年节省，节省300-600美元
Risk of getting bad foam job.... 1%
屋顶泄漏的风险未被发现1％
房屋平均拥有5年，回报可能会在每月较低的账单中出售。
Biggest cost annually, mortgage, property taxes, cell phone, cable tv with 800 channels
least cost.... utilities
强硬卖imo.
There is a niche... for those like us... but it is a small niche...
AJ - 您将靠近条件空间安装的数字。它就像4.5 K更多，以便在我们的地下室机械室内运行额外的管道工作和其他东西。在所有公平的他身上，他将其作为一种选择！
我们擅长通风吗？
“它就像4.5克一样，运行额外的管道工作和其他东西，以便在我们的地下室机械室内获得它。”
What other extremely low risk investment could you possibly find that would have annual after-tax payments in double-digit percentages (or mid-to high single-digits, worst case)?
If it's not too late, it's worth the up-charge to bring it all inside of conditioned space, which will limit the possibility of air-handler driven air infiltration. It's infiltration that makes wintertime air dry, and summertime air sticky. Leaks or imbalances between supplies & returns get amplified when the ducts penetrate the pressure boundary of the house- it's not just an insulation thing.
Too late :(.
虽然我可能会同意回报良好，但我也必须考虑资本配置和优先事项。此外，由于设计师没有设计房屋，因此我们的HVAC承包商必须切入我们的一个生活空间。
返回原创主题，我们通过在无条件的阁楼中安装一个ERV，我们擅长通风，这些设备在无条件的阁楼里供应我们的二楼拥有所有卧室。地下室和一楼不会得到ERV。
苏珊，当这些家伙谈论房子内部带来暖气时，他们的意思是绝缘阁楼空间而不是地板的屋顶，而不是在其他地方物理地移动设备。它留在最初的意图的地方，绝缘是移动的（并且可能从玻璃纤维变为喷雾泡沫）。
If your house turns out truly tight, then you will want a comprehensive ERV system that serves both floors. Ask your builder if he has had blower door tests done on other houses and what the results were.
Also, if you install an ERV, it should have its own separate ductwork rather than being tied into the ductwork for the heating/cooling.
Susan,
除非您的房子非常大，否则单个HRV或ERV应良好服务。但是，ERV应该具有专用的通风导管;您不应该尝试使用设计用于提供空间加热或空调进行通风的管道。
This ductwork usually supplies fresh outdoor air to your living room and bedrooms, while exhausting stale air from your bathrooms, laundry room, and sometimes your kitchen.
For more information on these topics, see:
Designing a Good Ventilation System
管道和ervs
There are many ways to bring it all indoors in new construction,. but as a retrofit insulating at the roof deck is usually a more viable (but not super cheap) option. It's usually cheaper to frame the upper floor a bit taller to accommodate the ducts & air handlers above a finished ceiling, but below an air barrier & thick fiber insulation layer, or run the trunk ducts laterally in a conditioned crawlspace, serving second floor rooms with duct chases. Whether a roof deck insulation solution is at all viable here depends, but it's a long shot. (I'd expect it to cost a lot more than the $4500 the HVAC contractor quoted for the alternative installation.)