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SpecMrCool Universal 2-ton R-454B (UHP18024-O + UAH18024-O)Senville Aura 24,000 BTU 230V
PhotoMrCool Universal 2-ton R-454B (UHP18024-O + UAH18024-O)Senville Aura 24,000 BTU 230V
Our scoreSCORE6.7 / 10SCORE7.5 / 10
Our takeThe 2-ton holds 20,600 Btu/h at 5°F (86% of rating) and turns down to 6,600 at 47°F. Strong numbers, but the warranty requires a professional install; DIYers should look at the Hyper Heat 2nd Gen.For a big open zone in a cold climate with a contractor doing the install: 24,200 BTU/h at 5°F. Its high minimum output rules out single rooms.
Nominal size24,000 BTU24,000 BTU
Voltage230V230V
Rated heat at 47°F24,000 BTU/h29,000 BTU/h
Heat at 17°F20,800 BTU/h22,200 BTU/hbest
Heat at 5°F20,600 BTU/h24,200 BTU/hbest
Lowest heating temp-22°F-22°F
Max heat at lowest temp12,100 BTU/hbest11,900 BTU/h
SEER218.6n/a
HSPF2 (Region IV)1013.5best
Install typeFlareFlare
Max line run164 ft164 ft
Warranty covers owner installNoNo
Warranty, parts10 yrbest5 yr
Warranty, compressor10 yr10 yr
ENERGY STAR Cold ClimateYesYes
ENERGY STARYesYes
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. Sold on Amazon by a third-party HVAC supplier we couldn't confirm as an MRCOOL authorized dealer; ask before you buy.Senville's 24k page shows a ceiling-cassette spec table, so these figures come from NEEP only. The Amazon 24k listing (SENA/24HF) doesn't state refrigerant; confirm the model before you pay. The Amazon Aura listings don't state refrigerant. The 12k listing (SENA-12HF-16) shows a 25.5 efficiency figure that matches the older R-410A Aura and a 2 yr parts / 7 yr compressor warranty field; confirm model and refrigerant before you pay. Current R-454B wall pairings are SENA-xxHF-OG + SENA-xxHF-IGG; older R-410A pairings end /OQ + /IQ. Senville's site lists higher HSPF2 and 47°F heat than the AHRI figures on NEEP; we use the certified numbers. Senville's FAQ says no to owner installs, and the warranty requires a licensed HVAC contractor.
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