Central Air-annual check up

[dpg]

Originally Posted by swnoel

I'm a HVAC technician and installer.

You might not need to do anything, if the system is not very old, your not experiencing any problems, and you change the filter regularly.

Then again... if you feel that you need someone to look at it.

I'm sure someone will be willing to take your money.

Can you please be more specific for all of us? Are there general "rules" regarding how long a system will go without professional maintenance? What's "not very old" one year, three, ten?? Do you have any tell-tale signs or issues to look for when a technician should be called in?