Product review (5 stars): Do it yourself and save $$$
Why pay an HVAC service agent to replace your humidifier filter when it it so simple. I just order this filter each fall before I need to turn on the heat. Go down to the basement to the humidifier attached to the forced air unit (that big thing that runs when the heat comes on), remove the two bolts at the bottom of the humidifier (the plastic tray with the drain line), remove the old filter, clean the inside, pop in the new filter, close that baby up and turn it on so it runs when your heating unit runs. Tip: Note how the old filter was positioned before removing it to make it easier to install the new one. And while you are around that big thing that runs your heat, be sure to check to see if the air filter needs to be replaced.