I would get the foil insulation package that they provide and make sure your platform is well insulated. If you can afford radiant floor
, that would be the best providing you can power/pay for it. This will save you space so you won't have to have a big heat source in the yurt, like a wood stove. They take up a lot of room, especially if you plan on having multiple rooms inside.
If you over insulate, you WILL have
issues so it has always been my opinion that you put in a more than adequate heat source. For me, the most I would ever insulate beyond what I have now is maybe some insulation along the walls, but we get temperatures here as low as -35 celsius.
I would also suggest at least one glass window so you could at least use a window air conditioner if the heat is too much in the summer months.
Many of the manufacturers offer tinted domes and they also usually have a
shade you can purchase too.