I’m one of those customers that observes closely any technician on any service call on my property. I also ask many questions (to add to my knowledge base). While I am not skilled enough to do these services myself, I am sharp enough to know when they are being done well.....or not. My Techs today were meticulous, explained what was being checked, took notes on readings, and performed very professionally. A job well done. Everything was explained clearly afterward, including one recommended future safety procedure.