Replacing furnace filters on a regular basis will prevent compressor freeze-up, dirty ductwork, fan failures, etc.

Putting off repairing a roof leak or a waterproofing project may result in mold infestations that are extremely expensive to restore to useable condition.

Non-functional exit signs, emergency lighting, smoke detectors need to be replaced immediately to prevent loss of life in case of a fire.

You sure don't want to wait long before you address this maintenance item!