Compare tool

Compare models side by side

Pick two to four models. The best figure in each row is marked, and every number comes from the maker, NEEP or ENERGY STAR. Copy the URL to share a comparison.

All mini-splits & heat pumps ranked →All dehumidifiers ranked →All window, wall & room units ranked →All heating ranked →All parts, tools & supplies ranked →

SpecMrCool Olympus E Star 4th Gen 9,000 BTUGree Sapphire R32 9,000 BTU 230V
PhotoMrCool Olympus E Star 4th Gen 9,000 BTUGree Sapphire R32 9,000 BTU 230V
Our scoreSCORE7.4 / 10SCORE7.5 / 10
Our takeA 9k that heats like a 12k: 11,500 BTU/h at 5°F and 27.4 SEER2. Contractor install only, sold through HVAC retailers.Gree's premium tier in its smallest size: 11,500 BTU/h at 5°F and 30.0 SEER2. Contractor install only.
Nominal size9,000 BTU9,000 BTU
Voltage230V230V
Rated heat at 47°F12,000 BTU/h10,600 BTU/h
Heat at 17°F12,000 BTU/h12,000 BTU/h
Heat at 5°F11,500 BTU/h11,500 BTU/h
Lowest heating temp-22°F-22°F
Max heat at lowest temp5,100 BTU/h7,400 BTU/hbest
SEER227.430best
HSPF2 (Region IV)12.5best11.2
Install typeFlareFlare
Max line run82 ft131 ftbest
Warranty covers owner installNoNo
Warranty, parts5 yr5 yr
Warranty, compressor7 yr7 yr
ENERGY STAR Cold ClimateYesn/a
ENERGY STARYesn/a
RefrigerantR-454BR-32
Watch out for"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.Amazon Sapphire titles show old SEER figures ("21.5 SEER" on the 24K); confirm the SAPxxHP230V1R32AH/AO model numbers. Gree's submittal prints lower 17°F figures than the certified NEEP ratings; go by NEEP. Gree's warranty applies only to installs by a state certified or licensed HVAC contractor, and claims are contractor-only.
More