Can I retrofit my grease furnace beside a fry pump? I live in Richmond, VA surrounded by a 1300 sq ft ranch....

I live in Richmond, VA surrounded by a 1300 sq ft ranch. I own an oil-fired burner for heating and glass A/C units for cooling. My heat system is located in the crawl space. I am considering a warmth pump for central heat and air and would approaching to explore the possibilty of a retrofit as an alternative to a completely new system. I would approaching some input regarding cost impact of one alternative versus the other. My thought is to remove the existing furnace and reaplace it beside the new nouns handler, connecting to the existing duct system (assuming the duct system is adequately sized to pass the required cooling cfm). Since the oil cistern and piping are already in place, an integral grease burner could serve as emergency heat (versus traditional electric). I see potential cost money by eliminating the materials and labor associated next to a new duct system. Thoughts?
Answers:    yes you can. You can even join the heat pump lying on your existing furnace and wire it up rope a fossil fuel kit or use a honeywell pro 8000 t-stat beside an outdoor sensor to control the system.If your furnace is bad later replace the furnace and install the heat pump higher than the new one. No big settlement either style.
If your current oil fired part is forced hot air, next you don't need to do anything to it except fit the cold nouns exchanger into the existing duct work with a splitter duct to switch backbone and forth from a/c to heat. Plus you necessitate the a/c condenser outside with the coolant strip, and you need to upgrade your thermostat and thermostat flex. The existing heat single thermostat wiring does not hold enough conductors contained by it.
Oh, and a thermostat wire to the outside section (can come from the fan element or direct from the thermostat location).