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SpecSenville Leto 18,000 BTU 230VMrCool Olympus E Star 4th Gen 18,000 BTU
PhotoSenville Leto 18,000 BTU 230VMrCool Olympus E Star 4th Gen 18,000 BTU
Our scoreSCORE6.4 / 10SCORE7.4 / 10
Our takeMatches the Aura 12k at 5°F on paper, but upsizing a Leto for heat gets you a bigger unit that short-cycles and still stops at 5°F.Full rated output at 5°F, the size we'd take for a cold-climate room or garage if a MrCool contractor quotes it fairly. Plan backup heat for -22°F nights, where it tops out at 8,000 BTU/h.
Nominal size18,000 BTU18,000 BTU
Voltage230V230V
Rated heat at 47°F18,800 BTU/h18,000 BTU/h
Heat at 17°F14,000 BTU/h18,000 BTU/hbest
Heat at 5°F11,500 BTU/h18,000 BTU/hbest
Lowest heating temp5°F-22°Fbest
Max heat at lowest tempn/a8,000 BTU/h
SEER2n/a21.4
HSPF2 (Region IV)n/a11
Install typeFlareFlare
Max line run98.4 ft98.4 ft
Warranty covers owner installNoNo
Warranty, parts5 yr5 yr
Warranty, compressor5 yr7 yrbest
ENERGY STAR Cold ClimateNoYes
ENERGY STARNoYes
RefrigerantR-454BR-454B
Watch out forAmazon Leto listings don't state refrigerant; current R-454B pairings are SENL-xxCD-OL + SENL-xxCD-ILL, older R-410A ones end /OY + /IY. Senville's FAQ says no to owner installs, and the warranty requires a licensed HVAC contractor."E Star" and the O-ES prefix also appear on an older R-410A Olympus (-230B condensers); confirm R-454B and an outdoor model ending -230C-O1. The Olympus listings on Amazon are the legacy R-410A Hyper Heat, not this unit. MrCool's FAQ says an HVAC professional must install it; the warranty's softer "may be necessary" wording doesn't change that.
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