Considering purchasing a 600. It humidifies to a max of 45%, but only at certain temps. Why only 45% at no colder than 10degrees, when the chart on your site shows 50% as the optimal for health?

Monday, November 7, 2011 by Aprilaire Team
Consumer question:

Considering purchasing a 600. It humidifies to a max of 45%, but only at certain temps. Why only 45% at no colder than 10degrees, when the chart on your site shows 50% as the optimal for health?


Aprilaires' response:

Thank you for contacting us with regards to our Aprilaire Humidifiers. As humans, we want the conditions to stay fairly constant year round, and 50% humidity would feel very comfortable across a wide range of indoor temperatures. When outdoor conditions drop to 10°F or lower, maintaining high humidity indoors can stat to cause problems. Humidity can start to condense on windows, sills, walls, and ceilings. The colder it is outside, the easier it is for windows to pull humidity out of the air. To compensate, our automatic controls will recalculate their internal set point to hold a lower humidity level when conditions are too cold to maintain the normal set point. In general, for every 10° drop in temperature, the control should drop 5% RH from its set point. By setting the control to a higher number, it can delay the temperature at which it begins to lower the set point. At a setting of 6, it waits until the temperature drops 10° more before starting to lower set point. At 7 it waits 20° before the initial drop. This is to try to maintain higher humidity for the longest possible time before starting to drop.
If your home starts to show signs of condensation, fogging or frost on your windows, the set point on the humidifier should be lowered by 1 number to let the house dry out a little more. If the humidity reaches the new level and the condensation disappears, the control is now set to the right level for your home. If there is still condensation at the new, lower level, the control should be lowered by 1 more number to let the house dry out further. This process should be repeated until the windows no longer show condensation at any outdoor temperature.
We appreciate the opportunity to be of assistance.

Comments for Considering purchasing a 600. It humidifies to a max of 45%, but only at certain temps. Why only 45% at no colder than 10degrees, when the chart on your site shows 50% as the optimal for health?

Leave a comment





Captcha