Hi, My home is 3500 sq. ft. and tightly insulated (closed cell foam). I have an existing oil furnace that supplies hot water for radiant distribution (Warmboard). I also have a separate traditional A/C with ducting for cooling in summer. If I were to add in a Geo system, can it tie into both the water-to-water for heating (while leaving the existing oil furnace as a backup if needed), and also tie into the AC ducts (water-to-air) for cooling (while leaving the AC system as a backup if needed)? Thanks for any info and suggestions.