Lennox calls the XC17 the most efficient single-stage air conditioner you can buy. With sound levels as low as 62 dB, it would take 40 XC17s to equal the sound from one air conditioner. The XC17 contains a SunSource ® Solar-Ready option that allows you to add solar modules and create a solar-powered system, generating electricity for your air conditioner and reducing energy and utility costs. Because of this, the system qualifies for a tax credit. The system’s SilentComfort™ Outdoor Fan Motor with Composite Fan Blades provides extremely reliable starting and running performance, even under the harshest outdoor conditions.