Welcome to NGA,
@MrL ! I totally agree with Thomas about the N-S orientation; you will not only get more even sunlight, but much better natural ventilation.
Is this the type of GH you're getting ?
I bought 2 of these several years ago (mine are 15 x 7) in 2010 and they have worked very well for me - unfortunately, the ones I got did NOT have UV-protected covers and the plastic deteriorated after just one season. So, one of the frames morphed into a "hoop trellis," by covering it with concrete reinforcing mesh, and the other has been recovered:
I also have an 8x16 Rion greenhouse and the hoop houses have worked just as well for me, for about $2000 less money! They have withstood our snowy winters and some pretty strong winds -- just be sure to anchor it down well, and if you're expecting a lot of wind, close it up.
Happy gardening!
