As for boilers, you don't need a lot of room anymore. You could go with propane and put a newer instant boiler in a closet. They are about the size of a suitcase now. They don't take up a lot of space but you would have to run baseboard through out the house. They also have units for forced hot air where the heating pipes are in the duct work.
There are lots of options you can run through with a heating contractor to see which best works in your particular situation.
The mini splits give you heat and A/C but those hyper units are expensive. Depending on how many you need and how much you are expecting to spend could determine your decision.
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