Does anybody know of a good HVAC supplier/installer in Winnipeg, MB.  Or even a good brand of HVAC systems that would be suitable in an SIP house. (2,000sq ft)

Have you looked at Radiant wall panels?

They are not only efficient but also can enhance your decor.

At present I am heating my office with the units and it is 26 below outside. The opeating costs are the same or less than natural gas. Check out www.redwell.ca. There is minimal or no installation factor as you hang them on the wall and plug them in.