I'm an HVAC contractor in Mass and I installed Aprilaire Air Cleaners for years. Unfortunately their replacement filter prices got too expensive and I've since changed to General-aire Filters. Another similar brand name is Trion Air Bear. Both of these are easier to replace the filters and less expensive than the Aprilaire. Once a year replacement is good for many houses depending how you use your system,whether you have shedding animals, and whether you have multiple zones. Check the filter after 6 months. My house in TV came with an Aprilaire and I only change it once per year. Another plus with the filters I've mentioned is that alot of brands share the same generic 20X25X5 filter which is not the case with Aprilaire which probably results in their higher cost.
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