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There will very likely be dust in your return duct work if you don't put a filter there (and there probably will still be some even if you do). This doesn't matter, since anything that gets picked up by return airflow is going to get caught by the main filter any way. You don't need a filter there, and you don't need your return cleaned.


For the record, I tried it out myself. I installed the Cool-N-Save system on a 4-ton A/C unit that was scheduled to be replaced in three months. After that three month period in the middle of the summer, the positive effects of the system were negligible at best, and probably detrimental. There were no detectible savings in cooling costs nor increase in ...

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