Thanks to everyone for the replies!
 

When I first moved to The Villages I bought a 12 year old manufactured home and never had the A/C serviced. I lived there for five years and never had a problem with it. How much money did I save? In my current home I did the same. It was a nearly new home when I bought it and I never had the A/C serviced. It took about seven years before I needed any servicing. I think the money I saved on servicing paid for the repairs. And the man who did the servicing didn't say that the problems were caused by lack of servicing. For the drain line I suppose you could say it was, but how much would I have paid for servicing if I had done it every year? $75 to $85 X 7 years is a lot of money.

Yearly A/C servicing is like buying an insurance contract on a new TV or microwave, in my opinion. Clark Howard, the consumer's advocate, says never buy an insurance contract on a new appliance.

Be careful, because bleach will make PVC pipes brittle, and cause them to deteriorate rapidly. Use vinegar instead. Needs to be used more frequently, but won't harm the pipes.