Heating and cooling issues: Fireplace chimneys must be cleaned out regularly to prevent he build-up of soot, the presence of large amount of soot can cause a fire risk in the home. Furnaces that have leaking gas supply’s pose a great risk of causing an explosion in your home, and the vent duct from the furnace must be properly secured to the chimney to let the exhaust exit from the home, often where the duct meets the chimney the joint will become unattached and that allows gases to flow into your home. Central air conditioner units must be cleaned, if leaves and other debris build up inside the unit the electrical components can cause a fire.