Indoor climate is the set of environmental conditions inside a building, including temperature, humidity, air exchange and air quality. A healthy indoor climate is essential for the comfort, well-being and health of the people who live or work in a building. Poor indoor climate can lead to health complaints, moisture problems and damage to the building structure.
Key factors
The indoor climate is determined by several interconnected factors:
- Temperature — Room temperature should be comfortable, typically between 18 and 22 degrees Celsius for living spaces. Heating systems, insulation and solar gain all influence indoor temperature.
- Relative humidity — Ideal indoor humidity is between 40 and 60 percent. Too low causes dry skin, irritated airways and static electricity. Too high promotes mould growth, dust mites and condensation on cold surfaces.
- Air exchange — Fresh outdoor air must replace stale indoor air regularly. Insufficient ventilation leads to a build-up of carbon dioxide, volatile organic compounds (VOCs) and moisture. Building regulations typically require a minimum air exchange rate.
- Air quality — This covers the presence of pollutants such as dust, allergens, VOCs from paints and furniture, radon, and combustion gases. Good air quality means low concentrations of harmful substances.
How to maintain a healthy indoor climate
Achieving a good indoor climate requires a balanced approach to insulation, ventilation and moisture management:
Insulation keeps the building warm in winter and cool in summer, reducing energy consumption. However, a well-insulated building must be properly ventilated to avoid trapping moisture and pollutants inside.
Ventilation can be natural (through windows and vents) or mechanical (through a ventilation system with filters and heat recovery). Modern energy-efficient homes typically use mechanical ventilation with heat recovery (MVHR) to maintain air quality without losing heat.
Moisture management involves preventing moisture from entering the construction (through vapour barriers and proper detailing) and removing moisture generated indoors by cooking, showering and breathing.
Home automation systems can monitor and regulate indoor climate by controlling heating, ventilation and humidity levels automatically based on sensor data.
Related terms
- Insulation
- Ventilation
- Home automation
- Air quality
- Moisture
Learn more about building terms in our knowledge base at fredsdiyplans.com.