4 of 8
BACKNEXT
Heating, Ventilation, and Air Conditioning (HVAC)
Heating, ventilation, and air conditioning systems require proper and regular maintenance in order to work efficiently, but even in the best case scenarios most components of such systems only last 15 to 25 years.

Furnaces on average last 15-20 years, heat pumps 16 years, and air conditioning units 10-15 years.

Tankless water heaters last more than 20 years, while an electric or gas water heater has a life expectancy of about 10 years.

Thermostats usually are replaced before the end of their 35-year lifespan due to technological improvements.



NEXT: Paint, Caulks and Adhesives

Last updated October 16 2008: 4:37 PM ET
More Galleries
Yahoo: 20 years of hits and flops The company that once was Google turns 20. We look back at the many, many brands it has cycled through. Remember Geocities? Broadcast.com? More
10 big dot-com flops Remember Pets.com? The Nasdaq is roaring back towards its all-time high. Here are some of the biggest dot-com busts from the last time the Nasdaq topped 5,000. More
The hottest gadgets at Mobile World Congress 2015 Take a look at the devices creating a stir at the world's biggest mobile tech show. More

Special Offer