HELP!!
My boyfriend and I purchased our first house a few months ago and there are SO many projects we need to start!!

One project I'm starting is in the livingroom. For some reason, only 1 wall (exterior wall) has wood paneling and when I knock on it it sounds hollow. I cut a hole in an inconspicuous area so I could see what's going on. There are studs behind it and it is 4 inches out from the black particle board looking wall that's behind it. I'm not sure what that wall is and I don't want to rip down the wood paneling until I know what's going on with the wall (because my boyfriend would KILL me!! Haha) we have a brick house so I'm wondering if there might be exposed brick on the other side of that particle board stuff, which would be awesome!
My other issue is that the heating runs along the floor in front of the wood paneling so I don't know how to rip down the paneling while dealing with that.
This will be the first of MANY posts I'm sure, since I have a whole lot of work to do on this house!!! Thanks in advance!!!