"I have had them out a couple times trying to find a leak in the air conditioning. They have been on time and polite. Fixing the problem each time and cleaning up after themselves. The two today were up and down the basement stairs removing parts and cleaned everything up and turned off the lights when they were done. I was even told ahead of time who would be at my house and their names. Spot on! Will continue to use them for all my heating and air conditioning."