The Lennox HS21 is a discontinued, two-speed air conditioning unit. This series contained six different models ranging from 11.40 to 15.75 SEER, and capacities from 34,000 to 57,5000 BTU/hour. The HS21 features a two-stage scroll compressor for cost-effective cooling, a high-pressure safety switch to help protect the longevity of the unit, a copper tubing/aluminum fin outdoor coil, and a heavy-gauge, galvanized steel cabinet finished with baked-on enamel for maximum unit durability.
A direct drive fan, the two-speed compressor and an insulated compressor compartment were designed to keep noise at a minimum during operation. Sound levels range from 76 to 78 decibels, depending on the model.
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