Hi: I think this topic was covered before, but I can't find it in the old threads. So if you can bear with me. My heat pump seems to short cycle ontly at night when the heat load is low. Recently, I had the heat pump serviced for another matter that I have discussed before so I won't go into it again, but the tech said that the filter that I am useing is pretty restrictive and that I should think about getting another one. He said that when the fan coil was running (Carrier FV4A) he pulled the filter out that I am useing the CFM's really slowed down, indicating the filter is too restrictive. Would some of you guy's let me know what is the best filter to use that will be the least restrictive, yet will keep my evaporator clean.

Thanks so much,