Why do people change their Filter not so often? how they should? Why do they wait so long for dust, pet hair and everything else to interfere with the filter and then blame the air conditioner? Filters need to be changed at least once a month - longer if you don't have a ball of German Shepherd fur. These filters are perfect - they fit my unit right where it clearly says the 20x25x1 filter size matches the filter size. The filter should have some "recoil" - enough rebound that you can slide it in and out for easy replacement. I've had no problems with these filters - installation and performance issues. I don't take out my tape measure to see if they're exactly 20x25x1 because they're not supposed to be. They are made to fit a 20 x 25 x 1 opening - and they do! They are much cheaper than local shops. I'm so glad I finally got rid of the 4" filter. I will be buying more of these in the future and really hope they don't change the price.
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