1:5:10:365 EcoTip Blog

October 27, 2008

:301 Indoor Dew Point

Filed under: :301 Indoor Dew Point — Tags: , , , , , , , — John Banta @ 12:17 am

Take the 1:5:10:365 challange: Do one thing – for 5 to 10 minutes – 365 days a year to make our home and planet environment better.

1:5:10:301 EcoTip: When using a set back thermostat the minimum indoor temperatures should be kept well above the dew point temperature. The dew point is the temperature that results in condensation forming. For example if you have the indoor temperature set at 68 degrees F and the indoor relative humidity is 50%, setting the thermostat back ten degrees would cause the relative humidity to go up to approximately 75%.  If the relative humidity goes a little higher than this for a short period – it should be okay, but if the humidity stays over 70% for a couple of days dust mites and microorganisms may find favorable niches to begin growing.

You can use the surface temperature of your windows to predict how far you can set back your thermostat. If the temperature of the window gets cold enough to reach the dew point (100% relative humidity) and condensation begins to form on the surface, you should try to keep the minimum set-back temperature of the room at least ten degrees warmer than the temperature of the window when the condensation first starts to form.

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 Additional Information:

Suggested Review: :116, :300

Tomorrow’s tip is about window condensation.

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