Electrostatic Filters

We have discussed disposable filters, pleated filters, and washable filters. Now I want to address the electrostatic filters. There is much hub-bub about these filters. One school of thought says they are too restrictive, while the other praises their efficiency in removing particulate from the air. Here is my experience: I have found the electrostatic filter to be very efficient (90%) in removing particulates and pollen from the airflow, however they need to be washed frequently--sometimes every two weeks because of the larger dust that will clog the surface and cause air restriction. This can be very harmful to furnace heat exchangers and cause freezing on air conditioning coils. The electrostatic filter needs to be washed frequently and sized in such a way to allow plenty of air flow through the return air ducting. I used Lifetime Filters in many installations and had great success with them. I was also able to get free replacement if the filter malfunctioned, clogged or came apart.
Bottom line check your filters, or better yet schedule changes based on filter type and use.
The best solution is of course a maintenence program from a reputable HVAC contractor.
Next time we'll look into electronic air cleaners.