Mike Phillipps wrote:I admire your ambition and it's a clever idea but I still think this is rather challenging to do with a smaller greenhouse. It has a very high surface to volume ratio. It requires a surprising amount of insulation and/or heat and there is relatively little space for plants. "Season extension" is one thing, growing year-round is another.
The dimentions arn't dead set yet, and may end up a bit larger but as i mentioned i will be putting in a few different methods for insulating and keeping temperature, such as:
1) The fan assisted 3ft climate battery as mentioned before.
2) Surrounding the lower section in water barrels to increase thermal mass and provide a bench for the plants.
3) Sinking the greenhouse 3ft into the ground to limit wind chill and help insulate.
4) Using double wall polycarbonate to increase insulation vs glass.
5) In winter placing bubble wrap around the walls to further increase insulation.
6) Placing a large insulated compost bin on the north wall and having a metal wall or fencing inbetween it and the greenhouse to provide passive heat.
7) The rest of the north wall will also be insulated.
8) The Rocket Mass Heater for winted heating.
The reason i want it to be year round is because i hope to eventually convert the greenhouse to be aquaponic. (After ive got the whole year round growth sorted).