Carrier. Featuring Greenspeed intelligence, the company’s latest Infinity heat pump offers an industry-leading HSPF heating efficiency rating of up to 13 along with cooling efficiency up to 20 SEER. The unit’s variable-speed scroll compressor provides consistent indoor temperatures while conserving energy. The line includes capacities from 2 to 5 tons. 800.227.7437. www.residential.carrier.com.