Mine is 1 per 1500 sq ft of two storey town house, upstairs not heated, downstairs heated by two natural gas space heater, central heat (unreliable) used as a back up, and not used otherwise. I am comfortable, it is single digit now in TN, I start shaking if I go to the garage to pick up kitchen stuff.
3200 sq ft house in Ontario would cost you a bundle to keep it warm in winter. It costs me about $30-40 a month to keep my 2850 sq ft home warm for 3-4 months from Dec through Mar.