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Spec	Senville Leto 9,000 BTU 115V	MrCool Olympus E Star 4th Gen 9,000 BTU
Photo
Our score	SCORE6.4 / 10	SCORE7.4 / 10
Our take	An efficient 115V cooler for a small room with modest heat, 6,500 BTU/h at 5°F, and a warranty that needs a licensed install.	A 9k that heats like a 12k: 11,500 BTU/h at 5°F and 27.4 SEER2. Contractor install only, sold through HVAC retailers.
Nominal size	9,000 BTU	9,000 BTU
Voltage	115V	230V
Rated heat at 47°F	n/a	12,000 BTU/h
Heat at 17°F	8,000 BTU/h	12,000 BTU/hbest
Heat at 5°F	6,500 BTU/h	11,500 BTU/hbest
Lowest heating temp	5°F	-22°Fbest
Max heat at lowest temp	n/a	5,100 BTU/h
SEER2	21.5	27.4best
HSPF2 (Region IV)	n/a	12.5
Install type	Flare	Flare
Max line run	82 ft	82 ft
Warranty covers owner install	No	No
Warranty, parts	5 yr	5 yr
Warranty, compressor	5 yr	7 yrbest
ENERGY STAR Cold Climate	No	Yes
ENERGY STAR	Yes	Yes
Refrigerant	R-454B	R-454B
Watch out for	Amazon 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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