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Compare the best high efficiency gas furnaces in Canada, including prices, installation costs, best furnacends, efficiency, and more. Get free quotes!.How much a furnace should cost. Average costs and comments from CostHelper’s team of professional journalists and community of users. Replacing a gas furnace can cost.Consider these tips to estimate the cost of a new furnace..HomeAdvisor’s Furnace Cost Guide lists pricesociated with installing or replacing a furnace including labor and materials, as reported by HomeAdvisor customers..