I had this problem a couple months ago, mold was starting to build up there was so much condensation. It is definitely because your house is to humid. Buy a hydrometer at Canadian Tire, they're less than ten bucks. Humidity should be in the 30-40% range. If it's higher you'll have moisture and i guarantee it is. Mine was at 53%. I have an HRV system in my house which is basically a fresh air / dehumidifier tied into the furnace and it wasn't working. Got it fixed and humidity is now in the low 30's and no moisture on windows.
Depending on the size of the house you might need a few dehumidifiers, one for each floor.
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