If your Maine house has a fireplace, make sure the damper is closed.
If you have storm windows, replace the screens with them before closing up for the winter.
Insulate any plumbing pipes that run through unheated areas and be sure to leave it at at least 55° to prevent burst pipes. (If you rely on propane for heat, make sure your tank is full). Drain your outside hoses and shut off the water valves to them.
Make sure you have your gutters cleaned after the leaves have fallen; blocked gutters often result in ice dams on your roof which can cause leaks.
Put away, if possible, all of your outdoor furniture. If you do not have a place to store it inside, cover it tightly with bungee cords.
Unplug all appliances.
Remove any valuables, especially those in plain sight.
Check that your insurance policy covers a vacant home.
Make sure all smoke detectors are working properly.
To whatever extent possible, don’t make it obvious the home is unoccupied. You might want to invest in programmable lighting timers as well as cameras that can be accessed remotely. An alarm system is also recommended. Homes that are vacant for long periods are the most vulnerable to thieves and, potentially, squatters. Many Maine vacation home owners hire someone to stop by weekly to check on the condition of the home and to make sure it is still secure.
For more information, visit:
https://www.travelers.com/resources/home/safety/snowbirds-winterize-your-vacant-home
https://www.vacasa.com/homeowner-guides/how-to-winterize-a-summer-home