Seasons change, but the functionality of your sunroom does not waver! Winter is here, and your sunroom is still the perfect place to spend time with your family. Sunroom windows, made entirely of CONSERVAGLASS SELECT™, make your sunroom warm and cozy in the winter, even if the snow is falling on the other side of the glass. How is this possible? Here is the story behind CONSERVAGLASS SELECT™. R-Value and Relative Heat Gain R-Value measures how easily heat travels through a material. The higher the R-Value, the greater the insulating effectiveness, and the lower your energy costs. Additionally, this produces an extreme level of comfort in your sunroom year round. Relative Heat Gain measures the heat gained through a glazing. Due to the low relative heat gain of CONSERVAGLASS SELECT™, sunrooms remain cool in the summer and warm in the winter. CONSERVAGLASS SELECT™ reflects interior heated air back into the room, which is why you can stay warm in the winter inside a sunroo