Picture window is the best option for panoramic views and greater glass areas. Although, most of the picture windows are inoperable, one may use operating casement windows on the sides of the bigger picture for ventilation. Because of increased glass area in the replacement picture window we strongly recommend window with lowest solar heat gain possible if the window is directly facing south. Also, it is important that if you live in the climate zone with cooler winters, such states as CT, then it is also crucial to remember about low U-factor. Remember the lower the U-factor the less heat your home is going to lose during winter.