Draining the water.
It really depends on your setup. If you're pipes are well protected, my guess it's not an issue. If they are exposed to the air, you're at some risk. 2 nights down to 27 degrees is pretty cold. Moderates again after that per Weather.com.
We drain the pipes Columbus Day weekend every year and fire it back up when we come up through Thanksgiving so long as overnight temps don't go much below freezing and daytime temps come up to the 40's. Our pipes are completely exposed under the house so we err on the side of caution.
If you have the time to get out there, I'd drain the system soon.
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