Heating an Addition on a House?

My husband and I have recently built on a 14' x 24' addition. We are not finished with it yet and we have not broken through to our existing house. The addition is built on sonotubes and is on top of our entrance to our cellar and crawlspace. Once the addition is complete we will have the new entrance into the cellar and crawlspace in the floor.

My question is, since we have not broken through and there is no water supply out there, do we need to heat it? We plan on putting banking around it as we live in cold Canadian climates. Thank you.

By Cyndi