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IEC: Frequently Asked Questions ...for outside air units (up to 30?F variation in cooling return-air temperature and up to 60?F variation in heating return-air temperature), but often they are not ideal for interior space units (as little as 2? to 5?F temperature variation in cooling or heating return-air temperature).? The low flow rates required for interior units to match the... See #1. 1: http://www.iec-okc.com [c1140813]