WaterFurnace’s 5 Series 500R11 indoor and outdoor split systems both feature the manufacturer’s Aurora controls, which include a microprocessor control to sequence all components for best performance. Troubleshooting features include fault lights and onboard diagnostics. Designed for outdoors, 5 Series outdoor splits are linked to an indoor air handler via refrigerant lines and control wiring. The 500R11 indoor split system is made for indoor spaces such as attics or crawl spaces, making it an attractive option for retrofit. The Energy Star–rated systems feature an energy efficiency ratio of 25.3 and a coefficient of performance of 4.4. WaterFurnace. www.waterfurnace.com