Condensation results from moisture in the air that appears on a surface that is cooler on one side than the other. This can happen on the outside of a cold beverage glass on a hot day, or on the inside of your window on a cold day. Causes vary, but the most common cause is a temperature differential within a humid environment. A well-sealed home with limited natural ventilation can also increase humidity and cause condensation. So will activities like showering, cooking and doing laundry.
To minimize moisture in the air, you can open your windows a crack or turn on your bathroom fan during a shower. Make sure to vent your dryer outside, not inside. If you want to invest in resolving a moist air problem, consider using a dehumidifier or installing an air exchanger or a heat recovery ventilator (HRV). A good, long-term investment is to invest in high R-value, sealed windows such as dualpane or tripane windows with argon gas.
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