I offer a 10year workmanship warranty. But was thinking about it today that why can't i offer a longer warranty? If no one touches my installation i don't see why it wouldn't last longer than 10years. IMO, longer warranty is a good selling point. 
I guess my 2 part question is:
1. How long of a warranty do you offer for your installation?
2. What could go wrong with an installation as it ages?
	
		
			
		
		
	
				
			I guess my 2 part question is:
1. How long of a warranty do you offer for your installation?
2. What could go wrong with an installation as it ages?
 
				
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		