I'm pondering purchasing a small 1955 seasonal ranch-style cottage by the shore, that has no furnace. There's also no basement or crawl space.

Its been winterized over the years, and I'm wonder what my options are as to installing either an oil or gas heating system. Right now the owners have electric baseboards they use on chilly evening but I'm not about to heat year round w/electricity.

What are my options w/o breaking the bank? There is a southern exposure.