I live in central NY, they say its zone 5, but its really 4. I have a glass 8 by 12 foot gh. I don't use it in the winter as it is free standing and would cost too much to heat. I do use it to grow up my seedlings. I put them in around April 8th, and have to heat it at night for about 2 weeks, until it warms up enough. I then put those plants outside, and put my orchids in it. When I heat it those first few weeks in April, I go through a 20 lb. propane tank every 3 days or so. After that, it mostly stays just on the pilot light and that seems to be enough for another few days. At that point, I turn it off during the day. I also have two, 50 gal. water barrels for solar heat and another couple of 30 gal. containers. It has a cement paver floor that helps hold some heat. My goal is to move it and attach it to the house. Then I would just get a 100 gal. propane tank for heat and keep my orchids in it all the time. I would have to raise it up 3 feet to match a door to the house, so I would gain even more room. Sterling

Of course! I have 3- 30 gallon pots with ALocasia "Purple Prince", Alocasia loweii Grandis, and Alocasia "Polly" that have been houseplants for many years...the Grandis almost 10 years! They have always been happy in the house, the occasional outbreak of mealies controlled by dishsoap and oil or Neem. These are large multi trunked plants. They have never been outdoor plants. I have a collection of Anthurium andreanums, about 12 off the top of my head, different cultivars, that live inside all the time. They bloom all the time. I have a huge 36" planter with a very large Monstera deliciosa that stays in by the dining room table year round. This plant is truly a "monster" no pun intended. Now, as of last month, I have a nice planter with Anthurium scandens hanging in my bathroom window, cuttings I took from my mother plant which is huge in a 20 gallon pot. Also some pothos (green and white variegated and green and yellow variegated) growing in the window. Also some huge pots of long trailing epiphytic jungle cacti sitting on the top ledge of my shower and trailing down about 4-5 ft on either side of the shower enclosure. Then I have three philos...a "Lemon Lime", an "Autumn" and a "Prince of Orange" that grow in the windows in the sunroom and den. These are year round houseplants. All do very well. I also maintain a very large sansevieria collection indoors year round.

Just a suggestion that you may not like but my cherry types keep producing in higher temps whan many other heirloom varietys just drop blossoms. Picking Black Cherry is more labor intensive but harvests are continuous and dependable. If you don't like the cherry fruit option the next best producers are the smaller fruited types. Pink or Red Ruffled, Japanese Black Trifele, or Eva Purple Ball are reasonable choices. I'm growing close to 200 heirloom varieties in a greenhouse setting where summer temps. often reach 100F in the daytime and they all produce fruit, most at levels that meet my satisfaction, some less. I shy away from anything with "Brandywine" in the name.

We will be having radiant in-floor heat throughout the house, so I would just run it out in the greenhouse too. I will also probably do some sort of air circulation system. Be sure to insulate the heck out of the slab it sits on! I would imagine that the extra humidity from it will be welcome in the main house in the winter, but problematic in the summer. I presume you will have a set of weather-tight doors (perhaps a double set, forming an airlock) between main house and this space, so that you can prevent warmth or coolth from travelling between the two when you don't want it to? --Steve