I have this issue in the fall. I generally don't worry too much without heat as long as the day time temps are above freezing and the temperature doesn't get below 20F (about -7C). It is the prolonged cold temps that are the issue.
The biggest concern is the city water connection, which you disconnected. You went further than I do by both draining lines at the low point drains and leaving the heat on. The last two I generally don't bother with unless the daytime temps are below freezing and/or the night time temps drop below 20F/-7C. You'll be fine!
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Al & Karyl
'08 Sunset Trail ST29RL
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