I've been thinking about a Sanyo 24,200 BTU Heat Pump Air Conditioner, Item# 24KHS72, as a heater for the downstairs of my 100 year old 2 story 2,000 sq. foot house in north central PA. The heat now is gas fired hot water baseboard and a 36,000 btu gas vent less wall heater that I put in last January to save money on the gas bill. The 36,000 btu vent less heater heated the house, the upstairs too with unused rooms doors closed, well enough until the temperature got below 10-15 degrees when I'd start the upstairs zone of the baseboard heat system. I've been told that the ductless mini splits are 2-3 times as efficient as other a/c or heat sources because of inverters, electric valve, etc. use in them. Is that true? An idea I had for the installation of a Sanyo 24,200 BTU Heat Pump Air Conditioner in my house is to put the outside unit in the cellar where the temperature is in the low 50s in the winter so that the cold air from the unit running in heat mode would further cool parts of the cellar for food storage as a root cellar while keeping the air circulating through the outside unit higher than ambient when it is colder outside than in the cellar. The cellar is over 1000 sq/ft and has 6 windows as well as outside doors. Is this a dumb idea? Thanks for your help.