Check more often in cold weather. Cool down boiler, open flush valve to drain out sediment - add water to proper level. Do this about once a month. Clean or change air filters on warm air furnace and air conditioners.
Spring Take down storm protection on windows and doors.
Put screens on windows and storm doors. Install air conditioner. Summer Enjoy cool breezes. Change or clean air filters in air conditioner once a month. Use air conditioner only when necessary.