change air filters - quarterly
flush out water heater - annually
clean dryer vent - annually
what else?(http://www.autoadmit.com/thread.php?thread_id=5523580&forum_id=2#47624716)
turn off water valve to hose outside in winter(http://www.autoadmit.com/thread.php?thread_id=5523580&forum_id=2#47627770)
Paint any spots on your siding that are showing wear and tear (annually)
Check all gaskets under toilets for deterioration (annually)
(http://www.autoadmit.com/thread.php?thread_id=5523580&forum_id=2#47627780)