Welcome
@dangles
First, if you haven't done so already, I would recommend you and your wife read every greenhouse thread in this forum for the past few years. There are a lot of opinions, good ideas, and good advice already here in this forum.
How experienced a gardener and what does she know about greenhouse growing? Before you drop a load of cash on something big and expensive, some people buy a smaller, cheaper one first to see if they will like greenhouse growing, and if they do, they upgrade after a while. My first greenhouse was a less expensive 8x14 greenhouse back in 2016 (@$4000). Last year I put up a 14 x 20 that is "top-shelf" ($23,000+ for greenhouse and extras), more than doubling my greenhouse square footage.
I have sold greenhouses online and have had two greenhouses myself. Be careful! They will advertise a greenhouse to make it sound like the best thing since sliced bread to get you to buy it, but it may not be the best for your plants, zone, wallet, long term heating/cooling costs, etc. They will even tell you it's a 4-season greenhouse when it actually isn't and would be like trying to heat your open front porch during the cold months!
At this juncture, unless you are going to build from scratch like some very talented folks have done here, I can only recommend 3 store-bought 3. They are not cheap and only for the serious and experienced, or new and EXTREMELY motivated, greenhouse growers, but they are the best out there IMHO. Growing in a greenhouse is VERY different from growing outdoors, and there is a real learning curve to be good at it.
RIGA
I currently own a RigaXL6 -14 x 20. They are available in up to 14 x 30. Has just about the highest snow load and wind rating of any greenhouse sold in the US and one of the few that was actually tested under snow/wind conditions. Aluminum Framing with two strong doors and 4 roof window vents. The polycarbonate is 16mm, triple wall, just about the best you can get. It is imported from Germany by Exaco, but only sold through distributors (shop around!). You will need at LEAST 2 people to assemble, 3 or 4 is even BETTER. I built it with one other person, and it was difficult since everything gets locked in, and it is one solid unit.
I installed an automatic 20" exhaust fan in mine with an 24" automatic intake louvre. On hot days, I can vent the entire air capacity in the greenhouse in less than a minute if it gets too hot. I put in a 425-gallon pond for a heat sink in the winter, and a cool sink in the summer. I also installed Phase Change Material Panels on the north wall as a heat sink in the winter and a cool sink in the summer. I grow all year.
https://exaco.com/greenhouse-r...
CERES
Very customized, very expensive. Might be as strong as a house. Probably the best insulated of all three here.
https://ceresgs.com/
Growing Spaces
My favorite greenhouse because of the character, versatility, and ability to grow all year. With that said, I did not buy this greenhouse because the size I wanted was out of my budget and it would not fit where I wanted to place the new greenhouse.
https://shop.growingspaces.com...
Read the threads and take a look at these greenhouses. If you have questions, let us know, and keep us up to date on your progress. Once again, welcome.
Jim
