New Aluminum Window
Glass spacers that separate multiple panes of glass in a window also affect energy efficiency. Historically, these spacers had been made of metal, which conducts heat. Modern spacers are made from stainless steel or composite materials that are less likely to transfer heat or contribute to seal failure .The use of argon gas — which has very low thermal conductivity — inside double-paned windows also helps insulate indoor air from outdoor heat.
While new windows require less care than old designs, regular maintenance is important.
Recommends homeowners look for exterior cracks around windows at least once a year. After heavy rain, check for leaks. Comeaux also suggests annual cleaning, but stresses the need to use ammonia-free cleaners, because ammonia can cause window seals to deteriorate. He also advises against pressure washing.