We are looking for an older house to purchase. Recently we toured a house which had hot water heat. Though my first reaction was negative, I realized I knew very little about this type of heating. How does hot water heating compare to forced air as far as efficiency, safety, etc.? Also, since there is no duct work in the house, I assume central air conditioning is out of the question? I assume they don't build houses with this type of heating any more for a reason, but I really don't have any facts to back it up. Thanks for any help!