up to 16 SEER & 81% AFUE Performance R-410A Chlorine-Free Refrigerant 2 - 5 Tons / Single Phase ★★★★★ ★★★★★ 4.8 out of 5 stars. Read reviews. 4.8 6 Reviews 5 out of 5 (100%) reviewers recommend this product Outstanding Warranty Protection The heat exchanger in the GPG16M Gas/Electric Packaged Unit is covered by a 20-Year Limited Warranty and all functional parts are covered by a 10-Year Parts Limited Warranty. This unit provides energy-efficient cooling and heating performance in one self-contained unit and is suitable for ground-level or rooftop installations and horizontal or downflow applications. Additional Information Before purchasing this appliance, read important information about its estimated annual energy consumption, yearly operating cost, or energy efficiency rating that is available from your retailer.