I am really disturbed about remodelers destroying and recycling perfectly good sliding glass doors simply because they are single pane and energy inefficient . The old slidiing glass doors in good condition can be reused as components for building greenhouses. All you need to do is plop them down the appropriate wood frame work you make. you got yourself a neat greenhouse on the cheap. Or you can use them as solar heat collectors to heat and circulate heated air into your house from outdoors. I just dont understand why remodelers just toss them into the trash bin and shatter the glasss then recover the extruded aluminium frames for recycling . Those sliding glass doors comes in two sections one rolling and another in fixed position that can be removed after unscrewing the retaining brackets.. They are more valuable as reusables than recyclables. I have trouble locating where remodelers are and asking them to remember to save those sliding glass doors for resales instead of shattering them and recovering only a couple bucks worth of aluminium. They are worth $50-$100 as reused glass sections that can be turned into great solar collectors that can deliver 10-25,000 BTUs worth of heat into your house!! Typical wall heaters deliver as much BTUs… Remember, you dont have to turn off solar collectors as sunlight is free and they can be left turned on non stop… Big difference to remember by!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! All you need is 10 watt fan to keep solar heated air circulating that can be powered with a solar panel . Why is it that everyone is so focused on photovoltaics while great stuff can be found and reused as ultra cheap solar home heaters for people on limited budgets!!!!! Havent you read about people not being able to pay for heat????? Lets start a campaign telling remodelers to stop shattering perfectly good old single pane slliding glass doors for a couple of bucks from the aluminium itself alone!!