Shutting off the outside water is step 1, step 2 is to drain the lines.
Changing your furnace filter should be done a minimum 1 every 2-3 months. I'm kinda anal that way and generaly change it once a month. The winter your furnace is always running so it needs to be changed frequently, in the summer it does not but you usually have your windows open more so more dust gets in, good to change in frequently in the summer as well.
Not a bad idea to drain a bit of water out of your hotwater tank once every few months as well, gets rid of the build of of sediment at the bottom of the tank.
Really, homes aren't that much work, just keep on top of the basic maintenance and you are golden.
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