As stated in another post all major brands have their share of problems. Before selecting any system a homeowner should be able to do their own research on the possible units that they may want. This research must include expected life, common mechanical issues, and cost of use. Depending on how old the system is, some problems should be expected, and they will happen once in a while. More on topic, I would suggest looking at a system that has the energy star symbol because it has a lower cost of use. Also take into consideration the amount of use, and the potency needed for your household. Usually aHVAC service expert should be able to tell you that.