by 
The Curious Bag
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<h4 class="dechead">On One Hand: They Can Save Money Over Time
Roof shingles with a 30-year warranty are fiberglass reinforced asphalt shingles, which are sturdy and last longer than other types of shingles. Some are also Energy Star qualifying, which will help hold heat in, cutting your energy bill. As of 2010, Energy Star 30-year shingles can mean a federal tax break.
On the Other: Warranty Coverage Prorates
After the first five years, the warranty on 30-year shingles prorates, meaning you will not get full replacement cost. Wind coverage on 30-year shingles may also prorate after only five years. If you sell your home, you may not be able to transfer the warranty or may have to pay a transfer fee.
Bottom Line
Consider your budget and future plans when choosing shingles. If you have the extra money to buy 30-year shingles now and you do not plan to sell your home, the extra upfront expense may be worth it. Otherwise you should consider asphalt shingles with a shorter warranty.
Source:
Rosie on the House: Pros and Cons of Asphalt Roofs
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