Greenhouse: is this a good greenhouse???, 1 by Indi1

Indi1 wrote:
From Z7a, I have had this one for approx 5 years. I don't use it year round, but I do start in February. I use a charmglo propane heater on the lowest setting and it has no issues keeping it warm. On the lowest setting, if its 30 outside, it will be 60 inside. The cover is one piece, so its fairly airtight. I have to open the door a little to keep in oxygen sensor going. Its been sturdy through a few inches of snow and ice as well as 70mph winds. I have included a closeup of the actual material.