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I am toying with idea of having my oil fired furnace converted to propane. The smell of the oil and the location of the oil tank are factors prompting this idea. I see that there are gas burners available that can directly replace the oil burner while retaining the existing furnace. I understand that the heating efficiency of the propane is less than that of oil and that changes in the flu would be required and so forth. Are there any major disadvantages to considering this type of conversion?