Could Canadian Churches Use Geothermal Heating and Cooling?

There has been a lot of talk in the City of Toronto about the Parkdale United - Green Phoenix Project which began construction in August, 2006 and I believe is still working to 100% complete a green renovation. As I also understand it, the church has installed large solar panels up the side of their apartment building on King St West in Toronto.  You can read a little more about it and their conference on Green Churches in Canada here