I live just north of Barrie Ontario and had the same issue. Switch my thermostat to a Honeywell indoor air quality system. It controls humidifier/air exchanger/furnace all at once in winter. With indoor and outdoor temperature sensors, it detects rapid temperature changes, and adapts all setting to avoid condensation. Works perfectly and solved my condensation issues on a house with original windows at 20 years of age. No mold, no condensation and humidity is balanced nicely.
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