98.5% efficiency, best sound level , low on gas and electricity usage, modulating and variable speed and ECM motors ,tighter temperature control, comfort fan and heat technology, insulation cabinet
96.7% efficiency, better sound level, 90% time working with low stage in two stage furnace , ECM blower fan motor, SmartEvap and fan and heat technology, insulated Cabinet
95.5% efficiency, good sound level, single stage, economic and fair price, fixed speed blower motor
