Hi Carol, I bet you are loving having the 2 HFGH joined together. The one I have quickly filled up with my tropical plants in no time. I actually have had to overwinter plants at my mom's house because I ran out of room! LOL She's ready for me to get the greenhouse done. :) My husband plans on doing some work on it this evening since it's not raining right now. I think he has it in his mind how he's wanting to join them together, something like you did I believe. I won't be having doors at both ends since we are putting the gas heater and exhaust fan on one end. That was the reason that my DH allowed me a third GH now, so he wouldn't have to move the heater & fan later on down the road when I say that 2 aren't enough. :0) He's knows me well! I'll be sure and ask any ? if we get stumped on joining the three. Thanks for offering. Hi Barb, You will love having a single door on the harbor freight. What a pain those sliding doors were! If they weren't coming off of the track when I was trying to open them, then the wind was blowing them open. And where the doors met there was always a small gap between them. I love my greenhouse now, but it will be even better when it's bigger. Too bad you will have to cut down your maple tree. But in the long run you aren't going to miss it that much. ;) Amber

You have us beat by weeks and weeks! Ah, for those who can't appreciate it....fresh tomatoes on North Coast in June, that's something.

I bought a clear solar pool cover for my 6x8 and wrap the whole thing in it for winter (except the door, of course). I have not tracked energy used, but I do feel it makes a difference. I cut the leftover material into strips which I hung, overlapping, inside the door and that, too, makes a difference. Working out there on a sunny but cold day, I can leave the sliding door open and the strips do a good job of keeping the heat in while allowing me to enter and exit without having to constantly mess with the door. (Especially handy if I have my hands full.) The pool cover was about $100, but we store it away when not in use and so far have gotten 7 winters' use out of it. I also insulated the north wall and the north 1/3 of the east and west walls with 1" thick, foil faced, foam board insulation. Above, on the lower portion of the north ceiling, I place a strip of 2' wide Reflectix insulation. These materials reflect light, as well as heat, back into the greenhouse. The first winter, I learned how important it is to put a draft barrier between ground and wall. I had put in a hardware cloth barrier to keep rodents out, but neglected the draft barrier. Pulled the gravel back and improvised that first winter, but the next fall installed a proper barrier. Of course, these things need not be done all at once. The materials are quite strong so will last for years, allowing you to do it in phases, if you wish. Attaching the solar pool cover: we've trimmed it so it fits nicely over the greenhouse, tape the rear end closed and tape the front, on either side of the door, to the frame and/or polycarbonate. It is secured at the bottom on the long sides with 3 wooden strips on each side. A drawing would be best, but don't have that capability so here goes: Two are secured parallel, horizontally, to the 2x10 treated lumber base with screws, and they stay on all year. They are spaced so as to allow the third strip to be attached between them, sandwiching the pool cover beneath. This has held up well through several winters, including some storms, and is fairly easy to attach and remove.

Insulation on North wall and North top is 1 sheet per top or side of Dow foil foam. The joint is taped longitudinally with reflective 4 inch duct tape material. Top is held in place with the bolts that are pre-positioned in the roof rafter tracks for hagning plants next spring. Sun-side panels are pre cut, sealed with duct tape and numbered to be taken off and put back on during sunny days. Air leaks - anywhere you see outside light, you have an air leak. Use silicon seal to plug every one you can find. ALso check your base plate - if the wood is at all uneven, there may be a leak there unless a leak proff seal was put down before the HFGH was built on the base. If you need more info or better photos, email me privately newfvt@sover.net You are in Portland - same relative zone as we are. Steve Here is a link that might be useful: attached HFGH pics with insulation