Vinyl is the ideal material for engineering high-performance, energy efficient windows and patio doors that are both beautiful and practical. Vinyl offers outstanding performance in energy and thermal efficiency ratings for windows and patio doors. Vinyl does not conduct heat or cold, and multi-cavity chambers in the window frame create a thermal barrier that blocks heat transfer. Vinyl windows are virtually maintenance-free. They never need painting or refinishing, and they won't rust, warp, decay or blister. Today's vinyl windows and patio doors are by far the material of choice for contractors and homeowners alike.