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Specifically, do you use two components- a direct evaporative cooler (spray chamber) on the exhaust side and a heat exchanger, and if so, what efficiencies do you typically use? I am seeing one whole-system rating from manufacturers: about 70% (in the Bay area). If winter heat recovery has a lower effectiveness than the IEC rating, how do you set-up/control it? I am specifically using IES<ve>, but any general information would be useful, or how other softwares handle this system.

Specifically, do you use two components- a direct evaporative cooler (spray chamber) on the exhaust side and a heat exchanger, and if so, what efficiencies do you typically use? I am seeing one whole-system rating from manufacturers: about 70% (in the Bay area). If winter heat recovery has a lower effectiveness than the IEC rating, how do you set-up/control it? I am specifically using IES<ve>, but any general information would be useful, or how other softwares handle this system.