Keeping pool open in winter in Pennsylvania

I'm a first time pool owner, with a new build on-line since this July. I've been considering the merits of keeping my pool open year around (vs. paying for cost of closing and re-opening in the spring.) Is this a crazy idea?

I live in the suburbs of Philadelphia.

I like the idea of being able to keep an eye on the chemical balance through out the year, and the thought of heating up the hot-tub for occasional mid-winter dips [even if I let the pool drop to a less than civilized temperature]