I saw these on eBay & thought they look great for those people who cant build their own glass house, they are built of replaceable corflu material so they insulate quite well i believe, not the same as the good old home made cold frame but they look really good value for money, have roof ventilation trolley size door way & aluminium frame. http://ebay.com.au/itm/… -- Steven : ) Esk Queensland Australia Summer Zone 5 Winter Zone 10