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SpecMrCool Universal 3-ton R-454B (UHP18036-O + UAH18036-O)Klimaire DIY 5th Gen 36,000 BTU 230V
PhotoMrCool Universal 3-ton R-454B (UHP18036-O + UAH18036-O)Klimaire DIY 5th Gen 36,000 BTU 230V
Our scoreSCORE6.7 / 10SCORE6.7 / 10
Our take37,400 Btu/h at 5°F and 27,600 max at -22°F on NEEP. A strong whole-house size for cold climates if a pro installs it. We don't have a verified Amazon listing for this size.The odd one out: 19 SEER2, 57% of its rating at 5°F and heating ends at -4°F. Skip it for a cold-climate job.
Nominal size36,000 BTU36,000 BTU
Voltage230V230V
Rated heat at 47°F37,000 BTU/h36,000 BTU/h
Heat at 17°F33,000 BTU/hbest23,400 BTU/h
Heat at 5°F37,400 BTU/hbest20,400 BTU/h
Lowest heating temp-22°Fbest-4°F
Max heat at lowest temp27,600 BTU/hbest16,700 BTU/h
SEER21819best
HSPF2 (Region IV)10best9
Install typeFlareQuick-connect
Line set in boxn/a16 ft
Max line run246 ftn/a
Warranty covers owner installNoConditional
Warranty, parts10 yrbest5 yr
Warranty, compressor10 yrbest7 yr
ENERGY STAR Cold ClimateYesn/a
ENERGY STARYesNo
RefrigerantR-454BR-454B
Watch out forThis is the 2nd-gen R-454B Universal (model numbers ending -O); most owner history online is about the discontinued R-410A first generation. MRCOOL's printed warranty requires a professional installer and an authorized dealer; the Central Ducted Hyper Heat 2nd Gen warranty allows owner installs with the Quick Connect line set. NEEP ratings with MRCOOL cased coils on a furnace are lower than with the matched UAH air handler, and some coil pairings aren't ENERGY STAR Cold Climate.Amazon 36K titles say "23 SEER2", but the bullets say up to 19 and NEEP lists 19.0. Believe the 19. The Klimaire Entrada (KIWE/KOIE, -31X, R-32, 17 SEER2) is a flare-and-vacuum unit; the DIY title reads "23 SEER2 Quick Connect". The 4th Gen DIY used the same KIWQ/KOIQ prefixes at 19.0 SEER2; confirm the -45T suffix and R-454B. The warranty page allows DIY installs, but the warranty PDF says licensed contractors only and excludes line sets. Get the DIY terms in writing and register within 45 days. The manual says the EZ-Fast Connect fittings are one-time tightening.
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