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The front wall of my house is really, really cold. When you sit near it, you can feel a cold draft coming in around electrical outlets. The wood shutter enclosures are cold. The closet in the garden floor is cold. There is cold air moving inside the walls.

Here’s the thing:
There are NO gaps, cracks, openings, etc. on the front wall of the house. I checked it myself. I also caulked the windows myself.

Here’s the other thing:
I had blown in fiberglas insulation put in my cockloft last year – I was told by the energy audit I had performed beforehand that this would cut down on cold air in the walls (since the walls are all lead up to the cockloft).

Here’s my theory:
I think the cold *interior surface* of the *exterior wall* (the surface inside the little airspace inside the wall) is radiating cold, which is creating convection currents, which explains the constant draft.

Here’s my question:
What are my options for insulating the space inside my walls?

I already got a quote for air-krete, but it’s really expensive. Does anyone have other suggestions of materials which can be injected into the space inside the wall? What are the pros? What are the cons?