We have used A STAR Air Conditioning for several years, and on some things, they do an excellent job for us. However, we have a couple of mini-splits that they have not been able to get back to working status for us. When we call them about the problem, they seem to spend much of their time conversing with the manufacturer. They have narrowed the problem down to a communication issue between a box, and the unit itself, but they have not progressed beyond that point. But at present, we still have some units that are not functioning, and we are not sure where they are at in the process.