Reduce the humidity and decrease the number of cool surfaces in your home.
Your first step is to find what the humidity level in your home is. This will need to be monitored regularly as the temperature outside varies.
Devices that measure humidity are called hygrometers. They can be purchased at most reliable hardware or home centre stores.
As a guide, the following chart should help:
Outside Temperature °F Inside Relative Humidity
|20°F to 40°F||Not over 40%|
|10°F to 20°F||Not over 35%|
|0°F to 10°F||Not over 30%|
|−10°F to 0°F||Not over 25%|
|−20°F to −10°F||Not over 20%|