Most homeowners think about temperature every day. Few think about humidity. Yet humidity may be one of the most important factors affecting comfort inside your home.

The Hidden Health Variable in Your Home: Humidity

Introduction

When people talk about home comfort, they usually focus on temperature.

Is the house warm enough in winter? Is the air conditioner keeping up during summer? Are certain rooms too hot or too cold?

But temperature is only part of the story.

Humidity—the amount of moisture in the air—plays a major role in how comfortable your home feels and how effectively your indoor environment functions.

According to building science and indoor environmental quality research, maintaining indoor relative humidity within an appropriate range can support comfort, protect building materials, and contribute to a healthier indoor environment.

For most homes, experts generally recommend maintaining relative humidity between 40% and 50% whenever conditions allow.

The problem is that many Alberta homes spend significant portions of the year outside that range.

Why Humidity Matters More Than Most People Realize

Humidity affects much more than comfort.

It influences how warm or cool a room feels, how effectively your body regulates temperature, and how your home responds to seasonal weather changes.

Research from Harvard’s Healthy Buildings Program identifies thermal health and comfort as important components of a healthy indoor environment. Temperature and humidity work together to influence how occupants experience a space.

When humidity falls too low, indoor air can feel dry and uncomfortable. When humidity rises too high, rooms may feel heavy, sticky, or damp even when temperatures appear normal.

Many homeowners unknowingly compensate by adjusting their thermostat when humidity is actually the underlying issue.

The result is reduced comfort and often higher energy consumption.

What Happens When Humidity Falls Below 40%?

Low humidity is one of the most common indoor environmental challenges faced by Alberta homeowners.

During winter, outdoor air contains very little moisture. As furnaces heat incoming air, relative humidity levels often drop dramatically.

In some homes, indoor humidity can fall below 20% during prolonged cold periods.

Common signs of low humidity include:

• Dry skin and chapped lips
• Dry eyes and throat irritation
• Static electricity shocks
• Cracked wood furniture or flooring
• Shrinking trim and millwork
• Increased dust circulation
• Frequent nose irritation or dryness

While these symptoms can have many contributing factors, excessively dry indoor air is often associated with household comfort complaints throughout Alberta winters.

Many homeowners simply assume these conditions are normal because they occur every year.

The reality is that many can be improved through proper humidity management.

What Happens When Humidity Rises Above 50%?

Although Alberta is generally known for its dry climate, excessive indoor humidity can still occur.

Modern homes generate significant amounts of moisture every day through cooking, showers, laundry, breathing, and everyday household activities.

If ventilation systems are not adequately removing moisture, humidity levels can rise beyond recommended ranges.

Common signs of elevated humidity include:

• Condensation on windows
• Persistent musty odors
• Damp-feeling rooms
• Visible moisture accumulation
• Basement humidity concerns
• Reduced comfort during summer

Building science research suggests that excessive indoor moisture can contribute to conditions that may affect building materials and overall indoor environmental quality.

This is one reason humidity control is considered a foundational element of a healthy home.

Why Alberta Homes Face Unique Humidity Challenges

Few places experience seasonal swings quite like Alberta.

Winter temperatures can plunge below -30°C while summer temperatures can exceed 30°C.

Those dramatic shifts create unique challenges for homeowners.

During winter, furnaces run continuously and indoor air becomes increasingly dry.

During summer, moisture generated indoors can accumulate if ventilation systems are not functioning properly.

Tightly sealed modern homes further complicate the equation by reducing natural air exchange.

As homes become more energy efficient, proper humidity control becomes increasingly important.

For many families, the issue is not a lack of heating or cooling equipment. It’s a lack of visibility into what the home’s humidity levels are actually doing throughout the year.

How Your HVAC System Controls Humidity

Your HVAC system does much more than heat and cool your home.

It plays a central role in managing moisture levels throughout the year.

Humidifiers

Whole-home humidifiers add moisture to dry winter air, helping maintain more comfortable indoor conditions during heating season.

Ventilation Systems

Heat Recovery Ventilators (HRVs) and Energy Recovery Ventilators (ERVs) help manage indoor air exchange while supporting humidity control.

Air Conditioning Systems

Air conditioners naturally remove moisture as part of the cooling process. Properly sized equipment can help improve comfort by controlling both temperature and humidity.

Smart Controls

Modern thermostats and indoor air quality monitoring systems provide homeowners with greater visibility into humidity trends and environmental conditions throughout the home.

Five Steps to Better Humidity Control

1. Measure Before You Guess

Use a hygrometer or indoor air quality monitor to understand your home’s actual humidity levels.

2. Monitor Seasonal Changes

Humidity needs change throughout the year. What works in July may not work in January.

3. Maintain Your HVAC Equipment

Properly maintained systems operate more efficiently and support better indoor environmental control.

4. Improve Ventilation

Kitchen fans, bathroom exhaust systems, HRVs, and ERVs all contribute to healthier moisture management.

5. Consider a Whole-Home Assessment

Humidity problems are often symptoms of larger ventilation, airflow, or building performance issues. A comprehensive assessment can identify root causes rather than treating symptoms.

Summary

Humidity is one of the most overlooked aspects of home comfort. Too little moisture can leave a home feeling dry and uncomfortable. Too much moisture can create conditions that affect comfort and indoor environmental quality.

For most homes, maintaining relative humidity between 40% and 50% provides an ideal balance of comfort and performance. The challenge is that many homeowners don’t know where their humidity levels actually sit throughout the year.

Understanding your home’s humidity is one of the simplest and most valuable steps you can take toward creating a healthier, more comfortable indoor environment for your family.

Ready to Breathe Easier? Start with a Free Home Wellness Assessment.

Alberta Indoor Comfort’s WellnessByHome team evaluates your home’s indoor environment, including humidity levels, ventilation performance, airflow, air quality, radon considerations, and water quality.

Instead of guessing, you’ll receive objective measurements and practical recommendations designed specifically for your home.

Book your free assessment:

• (403) 329-6400
• albertaindoorcomfort.com/wellness-by-home

Serving Calgary, Lethbridge, Red Deer, Airdrie, Cochrane, Okotoks, Chestermere, and communities throughout Alberta.

Verified Sources:

• Harvard T.H. Chan School of Public Health — Healthy Buildings Program
• Allen, J.G. et al. (2016). Environmental Health Perspectives.
• Wang, J. et al. (2023). Science of the Total Environment.
• Bosonea, A.M. et al. (2020). Allergy, Asthma & Clinical Immunology.
• Additional humidity and indoor environmental quality references from WellnessByHome research library.