Came out today for a no heat call. Upon inspection I found that the RUUD furnace was calling for heat . I observed the system start and run for about then shut down due to high temp. I removed the filter and found that the standard filter size 20x25x1 hasn’t been replaced since I performed preventative on 5-17-22. I explained to the homeowner that this air filter should be replaced every 2-3 months. In addition I highly recommended performing duct cleaning in the home to help improve the air quality. Charged for diagnostics today.