[misha]

Thanks Ron. They replaced the knob which is, I assume, the thermostat? Or, is that the heat control valve you are talking about? I have tried to learn everything to lead them by the nose, but they seem to feel, it's normal for this ac to not have much control when you turn the knob. They just aren't getting it, or they don't want to. I can't give up, because I live in the desert and can't have heat on top of the heat.