转自：dougtarry
如果您在寒冷的冬季期间要在室内保持40％以上的室内湿度水平，很有可能出现室内空气质量和湿度问题。这里有一些很好的指导方针要考虑：
加拿大肺脏协会建议如下：
•一年中大部分时间的相对湿度为30-50％，因为过多的湿度会促进霉菌的生长。
•如果您注意到窗户上有结露，请考虑用双窗格窗户替换它们，并对您的家进行能量分析。
•同时，使用窗户冷凝器作为加湿器需要关闭的指示器，或者您家需要更多的新鲜空气通风
虽然这个信息是相当不错的，但它更多的是针对现有的家庭，并没有完全反映出更严格的房屋，有HRV和ERV的趋势，并远离需要加湿器的漏水的家园。
CMHC建议湿度保持足够低，以防止窗户结露。为了限制窗户冷凝，您需要降低室内相对湿度。但是什么样的相对湿度水平是需要的，以避免家中寒冷的表面冷凝和结霜？
Doug Tarry Homes客户指南建议在冬季的几个月内保持冬季的湿度在30％到40％之间，在典型的冬季，这个范围会很好地工作。然而，这个范围是我们在安大略省西南部的地区给出的，我们在很长一段时间内很少低于-12°C。这个温度范围没有考虑到天气的-22°C（风寒-38°C），比如我们最近一月初的极度寒冷。
我们发现，在极端寒冷的天气里，试图保持40-45％室内湿度的客户在窗户上积累了过多的湿气。一旦我们改变湿度设置以反映外部空气温度，多余的湿度问题就解决了。在一月初-22°C的一天（有-38°C的风寒），我们必须把家里的相对湿度降到25％以下。一旦我们让ERV运行，水分问题就消失了。随着天气变暖，我们能够将相对湿度水平提高到更为正常的范围。
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Controlling Winter Humidity: What Level of Humidity is Appropriate:
If you are trying to maintain an indoor humidity level over 40% in your home during the cold winter months, there is a high probability that you are going to have indoor air quality and moisture issues. Here are some good guidelines to consider:
The Canadian Lung Association recommends the following:
• That a RH of 30 – 50% maximum for most of the year, because too much humidity can promote mould growth.
• If you notice condensation on your windows, consider replacing them with double pane windows, and getting an energy analysis of your home.
• Meanwhile, use the window condensation as an indicator that the humidifier needs to be turned down, or that your home needs more fresh air ventilation
While this information is reasonably good, it is directed more towards existing homes and does not fully reflect the trend towards tighter homes that have HRV’s and ERV’s and the move away from leaky homes that need humidifiers.
CMHC recommends that humidity be kept low enough that window condensation does not occur. In order to limit window condensation, you need to lower your relative indoor humidity. But what relative humidity level is needed to avoid condensation and frosting on cold surfaces in your home?
The Doug Tarry Homes Client Guidebook recommends maintaining winter humidity levels between 30-40% during the winter months and in a typical winter this range would work quite well. However this range was given for our area in Southwestern Ontario where we rarely go below -12°C for any extended period of time. This temperature range did not take into account -22°C (wind chill of -38°C) for days on end, such as our recent extreme cold spell in early January.
We’ve found that during extreme cold weather, clients trying to maintain their indoor humidity levels between 40-45% were having excessive moisture build up on their windows. Once we changed their humidity settings to reflect the outside air temperature, the excess moisture issue was resolved. On that early January -22°C day (with a wind chill of -38°C) we had to take the home’s relative humidity down to under 25%. Once we let the ERV run, the moisture problem went away. As the weather warmed up we were able to raise the relative humidity levels back up into the more normal range.