We operate some seasonal vacation cottages, and shut down for the winter. Temperatures are regularly below freezing in the winter, occasionally dropping below 0°F. Among other winterization tasks, we drain all the plumbing, put antifreeze in all the drain traps, and throw the main breaker... What issues would there be with shutting down any heat pumps we might install (e.g., mini-splits or water heaters) for 6 months each year? (we don't have any, yet...)