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They way to tell if your system needs cleaning is to have a look at the grills/registers. Are they dusty or is there accumulated dirt on them?
Shine a flash light through the grill/register, do the ducts behind the grill/register look dirty?
If so, then you should get your system cleaned.
As a general rule of thumb, we say every 5 years.
If you live in a dusty place or close to a freeway then maybe as soon as 3 years. If you change the filters regularly and you live in a clean environment then it could be fine for 7 years.
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