Consumers and inspectors and other professionals advising their clients should note that these life expectancies have been determined through research and testing based on regular recommended maintenance and conditions of normal wear and tear, and not extreme weather (or other) conditions, neglect, over-use or abuse.  Therefore, they should be used as guidelines only, and not relied upon as guarantees or warranties.     

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Appliance life expectancy depends to a great extent on the use it receives. Furthermore, consumers often replace appliances long before they become worn out due to changes in styling, technology and consumer preferences.  

APPLIANCES         

YEARS  

Air Conditioner (window)  

5 to 7  

Compactor (trash)  

6  

Dehumidifier   

8  

Dishwasher  

9   

Disposal (food waste)  

12  

Dryer Vent  (plastic)  

5  

Dryer Vent  (steel)  

20  

Dryer (clothes)  

13  

Exhaust Fans  

10  

Freezer      

10 to 20  

Gas Oven  

10 to 18  

Hand Dryer  

10 to 12  

Humidifier (portable)  

8  

Microwave Oven  

9   

Range/Oven Hood   

14   

Electric Range   

13 to 15   

Gas Range      

15 to 17  

Refrigerator  

9 to 13   

Swamp Cooler  

5 to 15  

Washing Machine  

5 to 15  

Whole-House Vacuum System  

20  

  

Note : Life expectancy varies with usage, weather, installation, maintenance and quality of materials.  This list should be used only as a general guideline and not as a guarantee or warranty regarding the performance or life expectancy of any appliance, product, system or component.    

Source: http://www.nachi.org/life-expectancy.htm