I am a highly skilled home service professional who recently completed a heating maintenance job for a client. During the maintenance, I verified that the air filter was clean and found that it was dirty. I replaced the air filter and cleaned the flame sensor and spark igniter. I also addressed any concerns the client had about the heating system and provided a quote for a humidifier. The client was interested in the humidifier, so I sent over the quote. I am happy to report that another happy customer is now enjoying a comfortable and healthy home.