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There is no fuel cost benefit to propane. Propane typically tracks the price of oil and (at least around here in NH) has a comparable price per gallon. You should also be aware that propane has ~92k btu per gallon of latent heat while oil has 143K. So even if the propane furnace is 10% more efficient that doesn't make up for the heat content difference.As far as furnace brands go; you're better off to primarily consider the quality/reputation of the installer than to focus on brand. A good installer will use a good product and will be there when you need service.