At VELUX we are proud to be the nation's leader in the leading manufacturer of quality skylights. Using the most modern technologies to make our products energy efficient is a crucial part of our environmental plan. To reap the green benefits associated with top lighting, it’s crucial that we block out heat gain associated with UV penetration, while minimizing air leakage, keeping in place the conditioned air inside your home. We inject argon gas between the panes of all of our glass and use Low Emissivity coatings to make our products the most energy efficient and environmentally supportive in the industry.