They do what they say they will do, when they say they will do it and for the price they quote. I have had the pleasure of having Lonnie and Martin working on and doing maintainence on my system in my home for over 15 yrs. I can not imagine calling anyone else. I leave them in my home without a second thought. I would give them a key to the house if I thought they would take it. Probably the most noteworthy trait, beyond their complete honesty, is their ability to communicate in a simple and concise manner what needs to be done and why.