clvlnd- It all epends how warm you want it. I have a 10' X 15' single pane glass greenhouse in Zone 8. I heat my greenhouse with an electric, 900W/1500W oil-filled heater. It's got a thermostat and I keep it on the lowest setting so the temp stays above freezing. You can usually get a decent one for about $50 (e.g., from Amazon). If you get an electric heater that draws more than 1500W, or run more than one, you're going to blow the breaker on a standard 15 amp circuit, especially if you have anything else plugged in. If you want to use something bigger, you're going to have to seriously upgrade the wiring that supplies electricity to your GH. One of the reasons I can get by with a small heater is that I also have 3 seed-starting mats that measure 1.5' X 4', and each one only draws 100W. I just set my sensitive plants and seedlings on that and everything seems to be happy. Since I usually have a power outage a couple of times during the winter, I have a small propane heater for backup.

Thanks for the info Sheri. I am going to have a metallurgist at the company look at the bolts. The base bolts appear to be stainless. I have the FED X number for the replacement parts. HF has been very good about making the shipping damage right, but they would save themselves a lot of money by packaging the houses better. I guess that they are used to shipping tools. As you know the instructions leave a LOT to be desired, so I might be asking for more help. Thanks again!

I'm so sorry to read about this...I can only imagine how upset you are, especially watching it happen. I'm glad it was empty (small comfort I know.) It's good you had the panels screwed down, at least they didn't end up in neighboring counties... I agree with foxesearth, a sturdy foundation and anchoring system is going to be critical when you rebuild. Here's my link too, so you can see how we anchored our foundation to the ground, and then anchored the GH to the foundation. Compared to some foundations you'll find in the archives, ours is very simple. (Do a search for HFGH 10x12 and you'll have tons of reading.) We feel confident we had quite a few 50mph wind gusts this spring, right on the doors of my GH (tightly clamped shut of course) and no problems at all. my HFGH blog I think you'll find Harbor Freight will order almost any part for you, but the problem is their awful record on shipping time. In spite of what they tell you when you order, many members here have had to wait a year (no kidding) for promised replacement parts to arrive. I've emailed Harbor Freight about this terrible record on shipping times, but did not receive much encouragement that they plan to do much about it. So, I'm guessing that might be a bit of a challenge, unfortunately. :-(

Good morning Jeymac, Iâve been happy with the solution of putting wood framing along the inside of the base channel. I do think it strengthens it somewhat (prevents the c-shaped channel from flexing as easily.) Also after years of living with the greenhouse, I think the bottom of that channel would have been a great catch place for bits of gravel, plant leaves, dust, bugs, and other greenhouse debris. Having the wood there makes it look cleaner, and it really does stay a bit cleaner too. Iâm sure my wood does not look as pristine as it did, years ago, after I slobbered water all over the benches, week in and week out. But I never notice it, back there under the benches. Neither my husband or I can recall what Gardenerwantabeâs base braces looked like, although I bet at the time we looked at those photos and considered that. We must have decided they were not critical, along with the wood we used, as we are both drawing a blank on what his braces were. I guess we are getting old? I donât really have any knowledge of anyone else using braces on their base to strengthen it, so I donât think itâs a deal breaker, but I do understand the wisdom of thinking through any options for adding strength as you go. I donât have a great source of larger photos for the details of joining two greenhouses together, although I try to watch for that on the web, since the question of joining two greenhouses comes up fairly often. There have been a few folks who have mentioned doing this on GardenWeb, but I donât think any have posted step by step close up shots. Funnylady has been super nice when we have emailed, and I hope she can give you more specific answers. If you folks do join two together, you might consider doing a thread on Gardenweb with the nitty gritty details of how you joined them....Iâll bet others would thank you, down the road! So many times, I find that everybody who builds one of these seems to find their own way for resolving some of these questions. I know we did, too; we researched everything we could ahead of time, but often ended up finding our own solution, based what seemed practical at that moment...what we could find in the garage to use...and/or what we could find in the aisles of Lowes. In other words, on most any of these modifications, youâll find there is more than one way to skin the cat...and the way you find may well be a better solution than what other folks have done. I didnât make any notes about the length of the bolts we used with the EMT, but since the EMT is ¾â, weâre guessing maybe 1 ¼â bolts. Just enough to slip through the drilled EMT and add a washer and nut. Best of luck with your build!