My home in upstate New York consists of a cape cod style main house (2 bedrooms upstairs) built in 1940, and a one-story addition that was put on in the late 80's. The house is heated with hot water baseboards in the new section and cast iron radiators in the original part. The new and old sections are separately zoned. The furnace is fired by oil. There are no ducts and no AC. I usually rely on window AC units for cooling.
I just learned about the existence of air to water heat exchange systems. I understand (I think) that this kind of system would provide hot water for the radiators and baseboards for heating, plus it can provide domestic hot water.
I would, however, like to add AC throughout the house. I had been looking into having a mini-split system installed, but then heard about the air to water systems.
My question is: Without ducts to carry cold air, is there some sort of a solution that would enable an air-to-water system to provide AC in my situation?