…cleaning their gutters. I know you know, but I tell everyone: clean them at least once a year. When I work with first time buyers I tell them over and over it is one of the most important things they can do to for their house.
As long as I’m at it, it is also important to have someone look at your roof every few years to make sure you have enough ventilation, your flashing is in good shape and ensure that a leak isn’t just waiting to happen. Clean your chimney and furnace and cover your outside hose bibs in cold weather.