Why Humidity Problems Show Up in Winter

Humidity problems are especially common in winter because cold outdoor air holds very little moisture. When that air enters a building and is heated, its relative humidity drops sharply unless moisture is added back to the air.

Even buildings with properly working HVAC systems can experience low humidity and related issues during the winter months.

Key takeaway: Winter humidity problems are driven by temperature and moisture physics, not system failure.

Cold Air Holds Less Moisture

Cold air simply cannot hold as much water vapor as warm air. In winter:

Outdoor air has very low moisture content
That air enters buildings through ventilation and infiltration
Once heated, the air’s capacity increases, but the moisture does not

The result is very low indoor relative humidity.

Key takeaway: Winter air starts dry and becomes even drier when heated.

Heating Air Lowers Relative Humidity

Heating air without adding moisture is the primary reason indoor humidity drops in winter. This happens because:

The amount of moisture in the air stays the same
Warmer air can hold more moisture
Relative humidity decreases as temperature rises

This effect occurs even when outdoor air temperatures are just moderately cold.

Key takeaway: Heating air lowers relative humidity unless humidification is added.

Increased Outdoor Air Makes the Problem Worse

Many buildings bring in more outdoor air during winter to maintain indoor air quality. While necessary, outdoor air ventilation introduces:

Very dry air
Large moisture deficits
Greater humidification demand

Without adequate humidification, indoor humidity continues to decline.

Key takeaway: Ventilation is essential, but it can worsen winter dryness if moisture is not replenished.

Why Winter Problems Feel Worse to Occupants

Low humidity changes how indoor spaces feel. During winter:

Air feels colder and less comfortable
Static electricity increases
Dry skin, eyes, and throat complaints become more common

Occupants may respond by increasing thermostat settings, which can raise energy use without solving the underlying issue.

Key takeaway: Low winter humidity affects comfort even when the temperature is controlled.

Material and Equipment Effects in Winter

Winter dryness often impacts materials and equipment before occupants notice comfort issues. Common effects include:

Wood shrinkage and cracking
Flooring gaps
Increased static‑related equipment issues
Paper and packaging distortion

Damage caused during winter months can persist year‑round.

Key takeaway: Winter humidity can cause lasting damage to materials and equipment.

Why Winter Humidity Problems Are Often Overlooked

Because winter dryness is seasonal, it is sometimes accepted as unavoidable. However:

Repeated seasonal damage accumulates over time
Comfort complaints increase every year
Equipment and finishes degrade prematurely

Proper humidification can significantly reduce these recurring problems.

Key takeaway: Seasonal does not mean unavoidable when it comes to winter humidity issues.

Next Steps

Contact your local DriSteem representative to learn more about humidity control. Use the Find a Rep tool below to find your nearest representative.