Consumer reports did a review of various air cleaners some time back. We have an electronic air cleaner at the inlet for our heat-pump. We were told that an ultraviolet light further downstream in the main duct is also recommended but we do not have this. The electronic filters do create negative ions and some amount of ozone as a by-product. I believe that some quantity of ozone is inevitable, but the amount created varies with the charge on the electronic plates in the cleaner. Better cleaners also come with heppa filters (not to be confused with heifer filters which only keep out cow-sized particles. In general, we were told that whole house filters are more effective than most of the smaller room filters. I'd recommend looking at the Consumer Reports article if you can find it. I have a vague memory that at least one of the smaller cleaners for specific spaces like a single room was considered acceptable to many were not. Ron Denis
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