Andy weir

wow I was just looking at how far away some of this advice is coming from and really am shocked. Thanks again to all that have given input.

I live in west Fernie and would love to pick your brain. Contact me through email at weride@weiboondocking.com maybe you would like to stop in for a beer or coffee in the greenhouse on a rainy day.

This last idea, making a draft with pavers sounds great. I look forward to having heat for the real cold nights.

I wounded if going to a thicker walled exhaust would still transfer heat so that we could still put it down the centre. Half the problem is that we have all our soil and bedding in, and after 3 years of working on the soil my wife would not be happy if we dug it up or even made any changes to our productive planting layout. This leaves us with only few options if we want to heat it, and thats why we want to heat under the walk way.
If this still can't work then I think we will need to expand to gain the room for the stove. Ether way I think its going to be a interesting fall when she do the install

This is a awesome start. Thanks for the reply. Why is it that we can't walk over the thermal mass. Ideally I would like the mass to run down the walk way in the middle of the greenhouse. If this isn't possible we will need to look at changing a few things for growing configurations.

First off this is my first post on this site and I really love all the things Ive read on here in the past. Now its time to become involved and start asking for advice.
We live in Fernie bc and its still snowing right now (May7). Our greenhouse provided well through out the winter but on the below 0F days I would love to have some sort of heat in there. The greenhouse kept above freezing most of the winter from just solar.
Although the greenhouse is 20 feet wide by 32 feet long we don't have much room left to put in a Rocket Mass Stove. I was wondering if a person could build the thermal sink ing the ground and have it heat from the ground up?
is this even something that could be possible?

Any thoughts would be great.