The 551J packaged rooftop air conditioner with electric heat is available in 3 to 25 ton models that are ASHRAE 90.1 energy compliant and Energy Star® certified. These units offer up to 15.6 SEER cooling performance and can be customized with a full line of factory options or field-installed accessories. Single- and multi-stage cooling models are available with a variety of heating sizes for each unit size.