For energy efficiency and safety reasons, homeowners should replace the filter in their Rheem air handler unit. I'll show you where it is located and how easy it is to change.
Locate Rheem air handler unit.
The air handler unit will probably be in the basement, garage or some lower level room of the house.
Using a flat head screwdriver, loosen and remove the screws securing the lower lid of the unit.
Remove the lid. Reach inside and pull the filter out.
Wash and clean the filter with soap and water. Let dry. You can also vacuum the filter and replace it immediately.
Replace the filter.
Turn the filter with the side nodules pointing downward. Re-insert in lower opening of the Rheem air handling unit. Replace the bolts and tighten with screwdriver.
Mark the calendar and make arrangements to clean within 30 days.