If the ACiQ heat pump works down to -22 degrees Fahrenheit why would you have optional heater coils?

Heat Pump technology is making rapid advances in recent years. But any heat pump system is still subject to the basic physical facts - the colder it gets outside, the longer it has to run to collect heat. You can run this model efficiently in far colder weather than a traditional style heat pump, but the efficiency and heat capability reduces with the outside temperature. The BTUs start to decrease below 17 degrees, and by the time outside temps reach -22 it is operating at just above 50% capacity. Below that, the heat pump turns off. Resistance heat provides electric heat no matter the outdoor temperature, and is sometimes referred to as 'emergency' or 'aux' heat. The climate in your area may mean that you don't need one, but at the price, it is good to have the second stage backup. If you have any further questions please feel free to give us a call! Thanks.