Even more amazing, the Federal Government is giving back 30% for solar and geothermal in existing homes and new constructions through 2019! Go to Federal Tax Credits for more details! Lennox offers a wide range of energy efficient products ranging from 80% to 98% AFUE (Annual Fuel Utilization Efficiency). Many of which are Energy Star qualified which means significant savings on your utility bills and a tax credit to boot! SunSource Comfort System, the industry's premier Solar Power-Assited Heat Pump!