Winter Humidity Management and Cleaning in Ontario
Ontario winter creates a specific indoor humidity challenge: forced-air heating dries the air to uncomfortable and damaging levels (below 30% relative humidity causes dry skin, wood shrinkage, static electricity, and increased airborne virus transmission), while the temperature differential between indoor warmth and outdoor cold causes condensation on windows that can damage window frames and create mould growth on sills and surrounding walls.
The Humidity Range to Maintain
Ontario homes in winter should target 35–45% indoor relative humidity. Below 30%: add humidity (whole-home humidifier or room humidifiers). Above 50% in winter: ventilate to reduce (excess winter humidity indicates a structural issue — typically inadequate ventilation — that causes condensation, frost on windows, and mould in wall cavities).
Window Condensation Cleaning
Condensation on interior window surfaces is normal in Ontario winter — at some level. The cleaning task: wipe condensation regularly (daily if severe) with a dry cloth to prevent the pooling water from sitting on wood sills and frames, which causes warping, paint failure, and mould growth. If condensation is severe (running down the glass, pooling on the sill), the humidity is too high or the window's thermal performance is inadequate — address the source rather than just wiping.
Humidifier Cleaning
Whole-home humidifiers on forced-air systems must be cleaned and inspected annually (typically at the start of the heating season). Drum humidifiers: replace the water panel/evaporator pad. Flow-through humidifiers: inspect the water panel for mineral buildup (replace if heavily scaled) and check the drain tube for blockages. Room humidifiers: clean the water tank weekly with a diluted white vinegar soak to prevent mineral buildup and bacterial growth.