Andrea Locke wrote:
One of our future projects will be a passive solar greenhouse built into the side of the hill. For that one we would run tubing into the hill for geothermal heating and maybe put in a trench or pit for diverting the cold air. Looking forward to seeing what comes out of the Wheaton Lab greenhouse experiment which should be completed before we're ready to make plans.
thomas rubino wrote:Hey Jimmy; I vote for a RMH!
We have been using one here in northern Montana in our greenhouse for 7 years!
The only way to go!
I just recently switched from an 8" J tube to a 6" batch box makes things even easier.
Are you thinking just shoulder seasons or all winter long?
Dan Chiras wrote:
Personally I’d strongly consider two earth cooling tubes run six feet under ground. I’d recommend run lengths of at least 100 feet and six inch PVC.
As you know, they will heat outdoor air to ground temperature of about 50 degrees F. This will help warm your greenhouse.
I’d also recommend earth sheltering and insulating the greenhouse. Although that may be a project you’ll complete in years to come. At the very least be sure to insulate the structure at night—that is, install Aluminet shade cloth that you can pull into place at night to hold the heat in.
It does a great job of reflecting infrared radiation that’s trying to escape from your greenhouse at night back into the greenhouse.
My book on Chinese greenhouses describes a number of other steps you can take to keep the greenhouse warmer at night.
If you just want to grow lettuce and other leafy vegetables throughout the winter, I’d strongly recommend you employ the Four-season harvest technique. All you need to do is install mini hoop houses over your grow beds within the greenhouse.
Sena Kassim wrote:Hi Thomas and Jimmy, we are in a similar conundrum. We want a greenhous and will likely have to provid supplemental heat for a few days each year.
W be considered diverting rain water to barrels for thermal mass. How about the days in a row that not much sun enters?
Not sure where you be. The above site is something to consider
Looking forward to hearing more solutions.
Michael Quartz wrote:
I will be posting progress and asking questions along the way. Thanks again folks!
Leigh Tate wrote:Jimmy, welcome to the Permies Forums!
I love reading about your place, your goals, and your plans. I agree that documenting is very important, especially photographs. Have you considered mapping out your dream homestead? Sort of a Master Plan? My husband and I found that visual tool to be a huge help as we planned and discussed possibilities.
I have to mention too, that my husband bought a small(ish) portable sawmill a couple of years ago and we have never regretted that purchase. He makes most of our lumber now, which has been a huge savings. Plus there's just something happy about building with your own lumber and timbers.
It will be interesting to follow along as you work toward your goals.