Ontario heat pump installation cost and possible rebates/programs?

We take possession of our newly built house in late May and I was just trying to figure out a reasonable price for a heat pump installation. For contest the house is a two story detached approx 1949 square feet. I think we can use the existing duct work for the central air. Southwestern Ontario, natural gas furnace already installed so the heat pump doesn't have to excell in the winter. Was looking for advice on price and possible rebates/programs we could take advantage of. All advice is appreciated!