Ideal Indoor Humidity in Winter in Ontario: Levels, Condensation and Fixes
The ideal indoor humidity in winter in Ontario is often 30–40%, lower in deep cold. How to measure it, stop window condensation, and choose a humidifier wisely.
, 5 min read
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Electricity prices updated November 1, 2026
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Last reviewed November 2, 2026
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The ideal indoor humidity in winter in Ontario is often 30–40%, lower in deep cold. How to measure it, stop window condensation, and choose a humidifier wisely.
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Set back the thermostat 2–3 °C at night and when away
For gas-heated homes, a consistent 2–3 °C setback typically saves roughly 5–10% on heating. A programmable or smart thermostat makes it automatic.
Keep heat pump setbacks small
Deep setbacks can trigger electric resistance backup heat during morning recovery, which is much less efficient. Keep setbacks to 1–2 °C or skip them.
Install a smart thermostat
A smart thermostat automates setbacks and can be controlled remotely. HRS has offered a $100 rebate on qualifying models; confirm current terms.
Check the furnace filter monthly in winter
A dirty filter restricts airflow, makes the blower work harder and can shorten equipment life. Replace it every one to three months depending on the filter type and household.
Book an annual heating tune-up
A licensed technician can catch problems early and keep efficiency up. Gas appliances should be serviced by a TSSA-licensed G1 or G2 technician.
Keep vents and cold-air returns clear
Furniture, rugs or drapes over registers block airflow and leave rooms uneven. Clear returns are just as important as supply vents.