tag:blogger.com,1999:blog-4563487586017212080.post7457390376023797099..comments2023-11-24T03:34:39.766-07:00Comments on Building our Harbor Freight 10' x 12' Greenhouse: Part Seven: Greenhouse Enhancementsmudhousehttp://www.blogger.com/profile/14797472938550347719noreply@blogger.comBlogger147125tag:blogger.com,1999:blog-4563487586017212080.post-9485451270044393532016-06-15T11:17:13.190-06:002016-06-15T11:17:13.190-06:00Hi Michael,
Thanks for letting us know, I did not ...Hi Michael,<br />Thanks for letting us know, I did not know they would email photos to help assist with the assembly. You're also absolutely right about needing the Item Number for the greenhouse (I tell folks to look on the front of the manual.)<br /><br />There are two different versions of the 10x12 Harbor Freight greenhouse in the market currently...with slight differences in some of the parts...although the website is now listing only one model.<br /><br />Thanks for the update on how to get more help!mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-4226002804017622042016-06-15T09:57:18.552-06:002016-06-15T09:57:18.552-06:00Ah, gotcha, Meso! Yeah, I wish we could all find a...Ah, gotcha, Meso! Yeah, I wish we could all find a good, long term solution for the short-term lasting ability of the Harbor Freight panels. Sadly I have just accepted the fact that the (low? or non-existant?) UV protection on these HF panels is part of the reason the kit is so reasonably priced. Polycarbonate panels, with true UV protection, and a ten year warranty, are really expensive. I know because I'm probably getting ready to buy some, and redo our HF greenhouse. I'm getting too old to enjoy replacing the roof panels (again.) <br /><br />This panel problem adds weight to the argument against the Harbor Freight greenhouse. I still maintain that the kit, with all the weaknesses, has been a fit for us. After almost 9 years, the sliding doors are a little fussy in the tracks, and the panels are (as discussed) an ongoing problem. But, the frame is solid, and it continues to house a huge number of plants for me, 24/7. I just wasn't ready, when we bought this kit, to plunge many thousands into a hobby I knew nothing about. The Harbor Freight kit gave me the entry I needed, so I am grateful.<br /><br />And, for what it's worth, the panels on the north side of my greenhouse, protected from the sun by insulation on the inside, and by the shelter of our house on the outside, look like new, after nine years. It's simply exposure to the sun, so how much you get affects how unhappy you will be with the panels.<br /><br />If I was putting up a new HF kit I'd probably still coat the panels with the TS-100 product, two or three coats, because I do think it helps...somewhat. And/or, I'd attack the internet with more research for something similar, because it's been a number of years since I turned up the TS-100 product by the Top Secret company. But I'd also bet that eventually, in a sunny climate, I'd probably be replacing them with something better. Real polycarbonate...or maybe Solexx. (Steely-eyed realist, here.) Who knows, maybe one of our intrepid HF community will pop up with a better solution.<br /><br />I hope things continue to get better for you. We "aged" our kit in the box for a long time too, and it doesn't hurt a thing, as long as you don't leave the plastic-covered panels exposed to the sun or a lot of heat. (The protective plastic can fuse to the panels, if exposed to sun/heat.)<br /><br />To be honest I always encourage folks to try to tackle this project slowly and have fun with it. Most gardeners are certainly "process" people anyway. (I can't think of a hobby that encourages more patience, can you?) The only folks I really worry about are those who contact me and ask, "can I get this up and running in an afternoon?" <br /><br />Yep, that worries me. :-)<br /><br />Best of luck to you!mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-8550343468340232632016-06-15T09:46:39.529-06:002016-06-15T09:46:39.529-06:00I spoke to the folks at Harbor Freight recently ab...I spoke to the folks at Harbor Freight recently about my 10 x 12 greenhouse. I whined about how poor the illustrations are in the manual and they emailed me about 30 photographs which do a better job showing what we need to see for assembly.Make sure that you have the "item number."Maxhttps://www.blogger.com/profile/00272356986250536539noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-55310785100743210122016-06-15T09:31:26.485-06:002016-06-15T09:31:26.485-06:00Hi mudhouse,
Excuse the change of User Name. (at ...Hi mudhouse,<br /><br />Excuse the change of User Name. (at least I hope it now shows Meso) Hubby made a mistake and used his real name...duh. I follow and have chatted with you, mudhouse, on gardenweb, but different user name there. oops.<br /><br />mudhouse, THANK YOU for the update. I agree with your description of the TS-100 and it's website. I have NOT been able to put up my greenhouse yet....only been trying to for over two years...wouldn't want to rush into anything. ( : Reasons for delay are mentioned on gardenweb.<br /><br />I probably won't have a chance of starting on it until October or November, if I even get to work on it this year. Everything is on hold. Seriously, I am still on my Jan. to do list!<br /><br />The blessing in that is that it has given me time to learn more. I'm attempting the SHCS on it. So, if you or Wulf Man find out anything better I can try it. I don't think it would hurt to put something over the panels.Mesohttps://www.blogger.com/profile/13495370977563033067noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-26710850000633588872016-06-12T22:55:53.734-06:002016-06-12T22:55:53.734-06:00Hi Marcus!
The link you posted above, to the TS-10...Hi Marcus!<br />The link you posted above, to the TS-100, is the same product I ordered from that site. It is a confusing website (and I found the ordering process to be a little glitchy too, but it was years ago.) They have the TS-100 listed under different several categories on the site.<br /><br />The TS-100 product is actually not a true epoxy (in my opinion) because it does not involve two parts or two steps. It's a single product you roll or brush on, after thinning with their proprietary thinner. (So, I find the name a little confusing, too.) I found it very easy to apply with a fine nap roller. I did two coats; other folks I read about did three coats.<br /><br />My updated evaluation about the product is that it did seem to help. I think it delayed the deterioration on my roof panels (the only panels I treated.) But in my harsh sunny climate, they still failed; they were getting brittle, and yellow, with tiny holes forming in the outside layer. An October hail storm was the last insult they could handle. These new panels, treated with the TS-100, had been in place about three and a half years, under Aluminet shadecloth year round.<br /><br />So I really don't know what the best solution is, at this point, to protect new Harbor Freight panels. I think some folks in milder climates may have better luck with a variety of protective measures; maybe Wulf Man can keep us posted about how his panels fare. I do wish Harbor Freight could improve the quality of their panel material, but I'm sure that would increase the price of the kit substantially...so I doubt changes are upcoming. Too bad, because this is probably the biggest shortcoming of the kit.mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-79790449943067595582016-06-12T16:57:40.858-06:002016-06-12T16:57:40.858-06:00Hi Wulf Man,
I have been following some of mudhou...Hi Wulf Man,<br /><br />I have been following some of mudhouse's posts because they are so great! Thank you mudhouse. <br /><br />So, I got this last posting and thought I'd share what I found out about protecting the panels from UV on the greenhouse. I think I read it somewhere on GardenWb Greenhouse Forum.<br /><br />mudhouse and other folks recommended Top Secret and some of them had painted it on the panels as long as 3 years (?) ago and the panel still look great. It is a two step (epoxy) process and you really don't want to get it on your skin or breathe it. <br /><br />I sure hope I used the right product..the website is VERY confusing. I went with the one called TS-100 Silicone Epoxy. I was listed under flooring, but one of the Webgarden folks mentioned it by name.<br /><br />http://forums.gardenweb.com/discussions/1607857/hfgh-panels<br /><br />http://www.topsecretcoatings.com/cstore/pc/viewCategoriesFloors.asp?idCategory=66<br /><br /><br /><br />Blessings!Mesohttps://www.blogger.com/profile/13495370977563033067noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-7399055759949824992016-06-12T15:22:02.929-06:002016-06-12T15:22:02.929-06:00Hi Wulf Man,
Thank you for posting good details ab...Hi Wulf Man,<br />Thank you for posting good details about your build; I'm sure it will help those reading here in the future. At this time, I'm not adding photos to the blog. However, you could consider starting a thread in the GardenWeb greenhouse forum, and include your photos there. That way other internet readers could see the fruits of your labor! <br /><a href="http://forums.gardenweb.com/forums/strucs" rel="nofollow">GardenWeb Greenhouse Forum</a><br /><br />Sounds like you are well on your way to a good sound structure. I hope you enjoy it for many years to come, and I'm glad the blog was of some help to you.mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-14165430230076912032016-06-11T21:52:00.852-06:002016-06-11T21:52:00.852-06:00Hello Been building my 10x12 greenhouse this week....Hello Been building my 10x12 greenhouse this week. We did a few things different than you did. We poured a 4" perimeter stem wall for the greenhouse. We attached the steel base to the stem wall with angle iron bolted to the concrete with redheads and 1/4-20 bolts with nylock nuts. We decided that just bolts and nuts were a poor choice so we added some lock washers to every connection. Every opening where a panel goes we pop riveted it to the steel base. We have decided to apply lots of extra clips to the panels per your advice as we get very high winds in the spring. I am leaning toward installing 1/4" cables over each end of the greenhouse and securing them to the concrete foundation. We decided to spray all panels before installation with marine urethane spar varnish for UV protection. Only time will tell if that's a good choice. We can reapply more next year if we see a change in the panels. We have taken pictures and can send them to you if your interested in other perspectives on assembly. <br />Thanks for all your information on assembly.Anonymoushttps://www.blogger.com/profile/15047797875406399526noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-55200051857333438352016-04-13T20:59:51.762-06:002016-04-13T20:59:51.762-06:00Thanks!Thanks!Mesohttps://www.blogger.com/profile/13495370977563033067noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-382935537147980522016-04-13T18:19:37.835-06:002016-04-13T18:19:37.835-06:00Hi Marcus,
I have never added UV film to any of my...Hi Marcus,<br />I have never added UV film to any of my panels. I do currently have a big sheet of UV greenhouse plastic stretched over my entire greenhouse roof, because we had a hail storm in October, and I needed a quick way to waterproof the whole roof for the winter. <br /><br />Here's a link to the blog of a Harbor Freight greenhouse owner who did apply 6ml UV greenhouse film to each of his polycarbonate panels. It's written for a 6x8 Harbor Freight greenhouse. If you go to Step 6 of his blog, he does a wonderful job of explaining how he secured the film to his polycarbonate panels, using HVAC foil tape. I hope this helps!<br /><a href="http://www.instructables.com/id/Building-and-Improving-the-Harbor-Freight-6x8-Gree/?ALLSTEPS" rel="nofollow">Building and Improving the Harbor Freight 6x8 Greenhouse</a>mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-21817388832731354532016-04-13T15:11:01.580-06:002016-04-13T15:11:01.580-06:00How did you put the extra UV 6ml film on the plast...How did you put the extra UV 6ml film on the plastic panels? HELP PLEASE ( :Mesohttps://www.blogger.com/profile/13495370977563033067noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-38973852291532831162016-03-04T17:17:11.714-07:002016-03-04T17:17:11.714-07:00One more thing, SilverDollarSaloon. If you do deci...One more thing, SilverDollarSaloon. If you do decide to buy yourself another few years by ordering replacement panels from Harbor Freight, be aware that there are two versions of the 10x12 greenhouse. <br /><br />You can find the model number by looking at the front page of your manual. (It will either be 69893, or 93358.) The HF website only shows one version currently, but you'll need to be sure you specify WHICH version you have, when you call up to order panels. There are some differences in the panel sizes on the back wall, if I'm remembering correctly.<br /><br />Hope this helps a bit. I know it' a huge aggravation and disappointment!mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-51197109561453793412016-03-04T17:10:26.585-07:002016-03-04T17:10:26.585-07:00Hi SilverDollarSaloon,
Yes, this has been a very d...Hi SilverDollarSaloon,<br />Yes, this has been a very disappointing shortcoming of the kit. Some people seem to get longer use than others, but clearly the Harbor Freight polycarbonate panels do not have the UV protection present in the polycarbonate sold by other companies. <br /><br />We've replaced our roof once already, with more Harbor Freight panels, and I'm getting ready to replace it again soon (along with most of the wall panels, this time.) You can buy more panels individually from Harbor Freight, but you'll have the same problem eventually, so you're really just kicking the can down the road. Some greenhouse supply companies sell 4mm twinwall polycarbonate that you can cut to the same size and shape as the HF panels. However, it's not inexpensive. The upside is, most of this material from other companies has a 10 year warranty. <br /><br />You could buy thicker twinwall polycarbonate to use from greenhouse supply companies, but be aware that the roof ridge will only accept 4mm thickness, so you'd have to figure out a way to deal with that problem, if you use anything over 4mm.<br /><br />There are some recent posts on the topic at the end of my section on Adding the Panels. Click here, and scroll down to the newest comments, for some thoughts about what others are considering. <br /><a href="http://hfgh10x12.blogspot.com/2007/08/part-six-adding-panels.html" rel="nofollow">Adding the Panels</a>mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-61138651371512326462016-03-04T13:02:35.947-07:002016-03-04T13:02:35.947-07:00I have this same Greenhouse with one big problem.
...I have this same Greenhouse with one big problem.<br /><br />What do you do for replacement panels when they all go rotten after a few years from sun damage.They turn brittle and crack all apart.Anonymoushttps://www.blogger.com/profile/04352938008646561995noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-52741265827472912162016-02-04T19:39:17.755-07:002016-02-04T19:39:17.755-07:00Hi Michael, I hope it's not really a scary pro...Hi Michael, I hope it's not really a scary project! Just go slow and enjoy the process (we just took our own sweet time.) And just a note, while you're waiting to start, this is a good time to compare your kit parts to the parts list in the back of the manual...just to be sure everything is there. It's not common but occasionally folks do wind up missing a part, and depending where you are in the build, I guess that <i>could</i> be scary (and surely annoying.)<br />Sherimudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-37308001197354817802016-02-04T13:19:30.835-07:002016-02-04T13:19:30.835-07:00I plan to begin this scary project this spring. I ...I plan to begin this scary project this spring. I am in North Central Nebraska with all known weather extremes. I am so happy that this site is still here and hope you keep it available as without it I don't think I would try this project. So called instructions are a horror. Soon I will order extras on clips, bolts, washers etc. before beginning. Thanks for all of your efforts.<br /><br />Michael SoudantMaxhttps://www.blogger.com/profile/00272356986250536539noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-65057143938857651712015-08-28T16:57:50.872-06:002015-08-28T16:57:50.872-06:00Hello Oscarsmartdog,
If there is one thing I'v...Hello Oscarsmartdog,<br />If there is one thing I've learned, it's that anything is possible. This kit seems to appeal to folks who are willing to do some re-engineering to use it in different ways. <br /><br />I've seen photos of folks joining two 8x10 HFGHs, end to end, for a 24' long single structure. That seems to work fine. I think splitting it in half will be a lot more difficult. You'll have to reinvent the bracing that is designed to go corner-to-corner on both ends. I think you'd also have to discard the top rail at the roof peak (because you only get one of those, and I doubt you can saw it in half) and build something to accept the poly panels at the peak, where it attaches to your house.<br /><br />The sliding doors will also have to be re-engineered, or probably discarded entirely, in favor of building your own hinged door (some folks prefer this anyway, and if you search enough on the web, you can probably find accounts with photos.)<br /><br />I worry that splitting it in half lengthwise would cause a large amount of work, because the design of the aluminum frame doesn't make it easy for you. When I add in the poor quality of Harbor Freight polycarbonate panels (almost no UV protection, in my opinion) I'd honestly suggest you also investigate building the structure you need, perhaps out of wood, and glazing it with a better quality twinwall polycarbonate product from a greenhouse supply company. I don't think it would be a lot more work than trying to retrofit the HFGH the way you describe. It would cost a bit more, because the polycarbonate panels (real ones, not HF panels) are not inexpensive, but you might have a much better structure that would last longer, and it might look like a higher quality permanent addition to your house (if that's a concern.) <br /><br />Also, you could then build it the width you'd want. I would find a 5' wide lean-to greenhouse a bit too tight, I think, but this is a matter of personal preference!<br /><br />I hope this doesn't sound too negative; I've seen folks do some very creative things with these kits. This is just a heads up that altering the framing to make this work seems pretty difficult, to me. You might go to the HF website, and download a manual for the 10x12. You can really study the drawings of the framework, to think about what you'd be cutting in half or losing, and it might help you troubleshoot some of the issues above. <br /><br />Brainstorming and thinking outside of the box often lead to very good things, and I hope you have good luck with your venture!<br />Sherimudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-83276926647310538972015-08-28T08:06:57.589-06:002015-08-28T08:06:57.589-06:00Wanted to get your opinion on something I'm wa...Wanted to get your opinion on something I'm wanting to do with this greenhouse. Instead of building it as a stand alone structure, I was wanting to have a lean-to greenhouse on the south side of my house. I was thinking about putting each half fastened to the house, so the ridge, would be fastened to the house.In other words I would be splitting the green house length way,and putting them end to end, making it 24" long. Thoughts, ideas????<br /><br />Thanks,<br />OscarsmartdogAnonymoushttps://www.blogger.com/profile/09962258492317809763noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-69794509890633961822015-01-04T15:17:47.650-07:002015-01-04T15:17:47.650-07:00Kip, I wasn't sure about that myself, when fir...Kip, I wasn't sure about that myself, when first installing the removable Aluminet screens on the south side. It hasn't been a problem at all, however. I think it's probably because our strongest winds hardly ever come from the south; most of the time they hammer the doors on my west end. (I keep the doors clamped shut with two clamps on bad wind days.) <br /><br />So, I can have very bad winds blowing directly on the doors on the west end, but even with the doors shut, I don't seem to have any problem with wind rushing inside through the screens on the south side. <br /><br />Maybe it's partly because I have such a large area screened...four of the six side panels...a larger area for the air to move in and out without much restriction? I'm not sure.<br /><br />A bit of wind/air can also escape through the floppy horizontal louvers of my exhaust fan, on the east end, opposite the doors. Sometimes I notice those little flaps banging open for a second, then falling closed again. I suppose that lets small errant gusts escape too.<br /><br />I'm guessing others might have a different experience, based on their GH orientation, and the direction of the prevailing breezes. But I love those screens, they've worked out very well for me, in this location.mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-21194576592836297342015-01-04T13:35:41.225-07:002015-01-04T13:35:41.225-07:00Mudhouse,
How has adding the 40% Aluminet been fo...Mudhouse,<br /><br />How has adding the 40% Aluminet been for higher winds? Seems the additional airflow in the side of the greenhouse could cause panels to pop out. Really like the additional work you have done to the HFGH. Am considering putting two together.<br /><br />KipKiphttps://www.blogger.com/profile/08586535766651635836noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-17099131171237656292014-09-28T15:12:22.231-06:002014-09-28T15:12:22.231-06:00Thanks Charles. I know there is a lot to wade thro...Thanks Charles. I know there is a lot to wade through here, but if you do you'll see the Harbor Freight greenhouses have some strengths and some weaknesses. However, if folks are willing to do a little brainstorming and extra work, I still maintain they can be an excellent value, especially for those who want to try having a greenhouse, without investing thousands. <br /><br />They are not for everyone, but for some of us, they are still a good fit. Best of luck to you,<br />Sherimudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-50325690056415056882014-09-28T14:33:07.985-06:002014-09-28T14:33:07.985-06:00Thank you for the great step by step and photos. ...Thank you for the great step by step and photos. I had the misfortune of attempting to use one of those "tent" type greenhouses. It folded in the first rain. So did it's replacement. I've been looking at the HFGH and stumbled across your blog while researching. GREAT STUFF! You've done a great service for this novice grower.Anonymoushttps://www.blogger.com/profile/03869281508315200535noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-34348345940160458552014-09-24T13:32:39.083-06:002014-09-24T13:32:39.083-06:00Hello Darren, my heaters are just inexpensive Hone...Hello Darren, my heaters are just inexpensive Honeywell 1500w heaters (Walmart I believe.) <br /><br />Because I pack my greenhouse floor so tightly with plants in the winter (it's pretty ridiculous) I don't think I could use an oscillating heater, since I avoid having the hot air blow directly on my plants. I move the heaters out of place when I'm watering, because water and electricity don't mix. I put them back in position later. Once I forgot, and left a heater blowing right on a Gasteria overnight, and it fried the poor plant on one side. <br /><br />I have the heaters pointed towards my open walkways between the benches, so they are just facing open air. Again, this is just my take, and might not fit your needs. We all structure our greenhouses differently inside.<br /><br />If you're thinking of using the same thermostats I show in this blog, you will need one for each heater. An electrician can help you sort out your needs in this area. Hope this helps!mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-10144211572750162192014-09-24T11:55:04.323-06:002014-09-24T11:55:04.323-06:00Thanks so much mudhouse for your answer. After mor...Thanks so much mudhouse for your answer. After more thoughts, I think I'm gonna get a 3-speed 16" fan (like yours), 2 motorized shutters, 3 plug-in thermostats (1 for the fan, 1 for the 2 heaters, 1 for the 2 shutters), and 2 electric heaters. What heaters do you have? I used littlegreenhouse's BTU calculator, and found that to maintain 60F inside, with the outside average temp of 40F, I'd need about 11000 BTU. I checked Amazon, and found a Lasko 5307 oscillating ceramic electric heater (1500 W, 5100 BTU), so I think I'll get 2. Do you see anything in my plan that can be improved?<br />Have a great day!Anonymoushttps://www.blogger.com/profile/01400288883932965435noreply@blogger.comtag:blogger.com,1999:blog-4563487586017212080.post-62843497678326521992014-09-22T15:04:30.501-06:002014-09-22T15:04:30.501-06:00Hello Darren, I suspect everyone does these things...Hello Darren, I suspect everyone does these things differently. <br /><br />I had the outlets installed above my bench tops, for convenience. Each one is on a different wall. You may also want to consider how and where you will water your plants, when considering location of electrical outlets. Also, electric heaters pull a lot of current, so the input of a good electrician is important. (Your local codes may require that, too.)<br /><br />My two heaters sit on the concrete paver floor, about six feet apart, but I think others may locate them differently.<br /><br />There are two basic reasons for fans in a greenhouse. One is to exchange the air (exhaust fan) and the other is to keep the air moving (circulation fans.) I use one exhaust fan that runs when temps go above 90F inside the greenhouse, and two cheapo oscillating fans that run 24-7, all year long, to always keep the air moving inside the greenhouse. One cheapo fan sits on a shelf close to the back wall, and the other is mounted on the wall over the doors. This is just the arrangement I've ended up with; I'll bet everyone has their own set up, after trial and error, and depending on how they use their greenhouse.<br /><br />Good air circulation helps plants grow better and reduces the chances of plant disease problems, so I always want the air in there to be moving, even when the greenhouse is closed due to cold weather.<br /><br />I would recommend looking for The Greenhouse Gardener's Companion by Shane Smith. It's been beloved for years by greenhouse owners, and it covers a lot of very helpful basic information. You can buy it on Amazon.mudhousehttps://www.blogger.com/profile/14797472938550347719noreply@blogger.com