According to the company, the Tempstar SmartComfort 2400 Series split-system heat pumps can achieve 15 SEER when matched with appropriate coils and blowers, offering homeowners a good investment in long-term operating cost savings. Available in capacities from 2 to 5 tons, these heat pumps provide ultra-quiet operation with efficiencies ranging from 8.5 to 9.0 HSPF when in the heating mode, says the manufacturer.