I have one in my HFGH. My house is set up for starting bedding plants so I have shelves along each side so it doesn't get in the way for me. You can see my original installation in the pictures I posted a few weeks ago in the thread about my construction and north wall insulation here http://forums2.gardenweb.com/forums/load/strucs/msg121339449284.html?8 I had problems getting it adjusted so that it would open and close at a higher temp so I have since added an aluminum angle, attached a redwood 2x4 block to the aluminum angle and attached the univent to it. It works much better that way. I'll try to take a picture and post it this weekend.

Update on January 1 (Happy New Year folks!) in response to a question by Baileybear in another thread... I wanted to add a photo of how we added a drape of Aluminet shade cloth to the interior roof. I think the Aluminet is probably more effective on the outside of the greenhouse, but I knew the wind would be a constant battle here, so we're trying it inside first. First we attached a 10' steel tube to the inside of the roof peak. (We had a piece of stainless tubing sitting around, but EMT would work fine.) My husband formed three hook shapes by doubling a length of plumbers strap (that flat metal strapping with holes) and bending it into a hook shape. Then he removed the nut from one of the bolts at the peak, slipped the hook in place, and replaced the nut. You can see the hook in the center of this photo, holding the bare rod. I laid the Aluminet cloth out flat in the yard, then folded it in half, and slid the rod into the fold. I secured the Aluminet to the central rod with wire twisty ties about every foot. (Classy, huh.) Then we carried the whole thing into the GH and hung it on the three roof hooks. (You have to make little holes in the Aluminet to poke the hooks through.) After securing the sides, it looks like this: On each side, we wrapped the Aluminet around another 10' piece of EMT tubing. If I decide to keep this set up, I'll put a hem in the shadecloth to slip the tubes in. Since this was a "temporary" experiment, we just rolled the edge of the Aluminet around the rod until it was taut, and secured it with more twisty ties and baling wire. The rod was then anchored to the top of the greenhouse wall with baling wire, looped around the bolts on our three central EMT ceiling braces, because they were handy. (The EMT ceiling braces are the three horizontals you see in the lower part of the above photo.) I just cut a small slit in the Aluminet so I could stick my hand through to operate the roof vents. The Aluminet does not unravel when you do this (it's cool stuff.) So far I like it. If I want less shade, I can unfasten the rod on the south side and slide it all the way across the greenhouse to the north side, riding along the tops of our three central EMT braces. That way the south side of the roof is fully exposed to sun, and the north side of the roof has two thicknesses of shadecloth in place. Although, I haven't done it very often...I'm learning that sunny days even in December can heat up the GH so fast that I just leave the roof shadecloth in place...but that may be a quirk of our desert climate, and I'm still experimenting. One more update...because of the cold nights, I have all of my poly panels back in place on the south side. But, I figured out I can put the screens back in place OVER the poly panels by holding them in with clips installed backwards. Looks silly, but it provides just enough snugness to keep my screens in place. I've also made a triangular piece of Aluminet to go over the inside west gable, over my doors. I just cut it to size, hemmed it by hand, and it's attached with velcro to the aluminum frame. Our west sun is brutal even in late afternoon, especially in summer. I can take a photo if it would help anyone. If any of this is unclear, let me know. That's where I am so far in my learning curve! Sheri

I have a HFGH that was put up in April of 2007. There's a small wall type propane heater that does a nice job. Now I have an idea for a "Greener Heating System". What I'm thinking of doing is burying 4" PVC pipe in the floor with one end extended up to the peak of the greenhouse and the other end at floor level. The plan is to have a small fan blowing the hot air from the roof area into the PVC piping in the floor. The floor, that is now dirt with a layer of crushed stone on it would act like a big heat sink. Has anyone out there ever tried this? Any comments or suggestions would be appreciated. Thanks in advance. Joe Here is a link that might be useful: My HFGH

Shelf supports: 2 2x4's set on edge (8 feet long) supported in a "sandwich" of 2 2x4's 32" high at either end of the HFGH. This brings the great covered grating exactly to standard kitchen counter height. Shelves are easily removed in 2 four foot sections. I used untreated 2x4 because with the plastic drip pans underneath we can let excess water drain off - and I did not want the chemicals in treated wood dripping on any plants we might set below. We have the 2 6' greenhouse benches that HF sells for the 6x8 HFGH as well. They are "spares". Insulation: Exterior panels are simply wedge fit. They have been in daily on/off use for over a month and are working perfect even in 20-30 mph wind. Our HFGH is protected by a Northside 8' fence and the house. Interior insulation. North wall, bottom - wedge fit 4x8 insulatin trimmed to (I think) about 44 inches tall. North wall ceiling - the extra bolts you are instructed to add in some of the Garden web HFGH construction posts are simply popped through the insulation at the ridge rafter. Bolts: The underside of the roof rafters has a track in it. If you ever want to hang plants inside, during construction you need to slide a nut with abolt attached down that channel before assembling the roof rafter to the ridge and side walls. We used 2" x 13/16 eye bolts which will take the hooks from most hanging baskets. These eye bolts are popped through the insulation and turned 90 degrees to the face of it - hold it up fine. For "personal or detailed responses" please include your personal email - it is a pain finding this thread on Gardenweb! Hard to add photos to the photobucket series as doing so will knock the logical order of the slides all to simthereens Happy thanksgiving Steve & Kathy Wisconsin