I gave 4 stars, until I learn how to use it better. But, it is already saving me money, that’s what it was intended for. The temperature in my house is also much more stable, I’m more comfortable. That truly is a win, win.
I find it difficult to work with. It cannot keep a steady temperature. If the unit is on AC mode and the temperature goes too low, you need to manually switch it to heat mode. This is bothersome.