The size is perfect for a small back yard.  The zip up door rolls up and Velcros for easy access.  When the greenhouse is zipped up, it is much warmer inside than outside.  There are two window panels that allow for air flow through the greenhouse on warm days.  The only negative comment I have is that the zip ties that are included aren’t strong enough.  I had to buy a pack of zip ties to complete the assembly, which wasn’t a big deal.