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Basics & Theory

Energy Vanguard: Are You Making This Mistake With Humidity?
Energy Vanguard explains that dew point or saturation has nothing to do with the dry air component. It's all about the water vapor and the temperature of the air, which is a mixture of dry air and water vapor.

Energy Vanguard: Relative Humidity, Cold Air Is Dry Air
Energy Vanguard says relative humidity can be a bit confusing, especially when the temperatures drop.

HVAC School: Impact of Adding or Removing Water From Air
HVAC School says we often add water to the air (humidify) and remove water from the air (dehumidify) as part of our work. they take a different look at what happens when we do that.

HVAC School: Relative Humidity of Air Below Freezing
HVAC School describes how air can still contain water vapor even below freezing.

Building Science: High Interior Humidity Buildings
Building Science experts discuss the issues and considerations for art galleries, museums, indoor pools and other specialized buildings that require high interior humidity.

Building Science: Relative Humidity In A Home
Building Science describes the theory of relative humidity, and how to decide what relative humidity level should be in a home. (PDF)

Building Science: Residential Humidity Control Strategies
Building Science online slide show presentation describes issues and recommendations for residential humidity control. (PDF)

CMHC: Measuring Humidity In Your Home
CMHC fact sheet explains humidity problems, diagnosing, hygrometer selection & use, and provides links to more information. (PDF)

Energy Vanguard: Controlling Humidity in Your Home in Winter
Energy Vanguard describes some issues and considerations for controlling humidity in your home in winter.

Healthy Heating: Humidity Is Important in Indoor Environmental Engineering
Healthy Heating says people installing whole home A/C systems for thermal comfort in high performance homes with the assumption that effective dehumidification will occur, could be sadly disappointed as compressors cycle down or off due to the low and infrequent cooling comfort loads especially associated with shoulder seasons.

Pro Trade Craft: The Psychrometric Chart
Pro Trade Craft explains the psychrometric chart and how moisture behaves in the air as temperatures rise and fallórainstorms, flooding, and glaciers in wall cavities are distinct possibilities.

US DOE: Recommended Approaches To Humidity Control In High Performance Homes
US Department of Energy report on their expert meeting on Recommended Approaches to Humidity Control in High Performance Homes summarizes discussions on residential humidity control to address modeling issues for dehumidification. (PDF)
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