Desert Botanical Garden: THE DESERT HOUSE: Windows

Glass windows offer little resistance to heat flow, and according to some estimates account for as much as 50% of the cost for heating and cooling. To reduce heat transfer and therefore money spend on energy, the Desert House uses vinyl-clad wood frames around the windows. Wood frames transfer much less heat than aluminum frames and the vinyl covering protects the wood from moisture and eliminates the need to paint the frames. The windows at the Desert House are double paned with the panes separated by two insulating air spaces, divided by a film that screens out 90% of the sun's heat and ultraviolet radiation yet allows 70% of the visible light into the house. Visitors can experience the heat insulation qualities of this window system by placing one hand on the interior and one hand of the exterior of the patio door. The temperature difference will be quite noticeable and significant. A similar demonstration is available in the Technical Exhibit area.

Light colored interior window coverings, such as shades, blinds, or shutters are effective in minimizing heat transfer. All the non-clerestory windows of the Desert House have white wooden shades or blinds on the interior side. Dark-colored blinds and shutters absorb outside heat and conduct the heat towards the interior of the house. Light colors, especially white, on the inside reflect most of the heat outward.