As previous answers point to adding proper insulation in the attic, it is also recommended that using a leak barrier under the roof shingles from the eave of the roof back until you reach 24 inches ab ... read more
Hi Glenn,
If they are cloudy between the panes it is almost always and indication of "Seal Failure". If the windows are still covered under a 10 year warranty you should first contact the window manuf ... read more