The cost to heat the house at 55-60 degrees isn't that much. Nobody home, no outside doors being opened. You be surprised how much savings there is in lowering the temp 10-15 degrees. Did this for a number of years with our cottage, never winterized it.
We have a WiFi thermostat that will send an email if the temp drops to 45. It will also email if the temp drops 5 degrees during a heating cycle. We have a well so turn off the pump, relieve pressure and drain all lines into basement laundry tub. Neighbors have a key and our son only lives 7 miles away. I can turn the heat up during our trip home so the house is comfortable when we arrive.