We recently purchased a Marvin Integrity window for our home. We know that some condensation is normal. However, the new window has water dripping in the morning (outside only). The window has a southern exposure and in direct sunlight for most of the day. We lower our thermostat to 68 degrees at night. Our other windows on east and north side of the house have some exterior condensation, but nothing like the new south window. Is this normal?