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SpecDella Serena 24,000 BTU 230VSenville Aura 24,000 BTU 230V
PhotoDella Serena 24,000 BTU 230VSenville Aura 24,000 BTU 230V
Our scoreSCORE7.3 / 10SCORE7.5 / 10
Our takeKeeps 87% of its rating at 5°F, the best retention in the Serena line, for a bigger shop where winters stay above 5°F.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°F22,400 BTU/hbest22,200 BTU/h
Heat at 5°F20,800 BTU/h24,200 BTU/hbest
Lowest heating temp5°F-22°Fbest
Max heat at lowest tempn/a11,900 BTU/h
SEER222n/a
HSPF2 (Region IV)1013.5best
Install typeFlareFlare
Line set in box16.4 ftn/a
Max line run98.4 ft164 ftbest
Warranty covers owner installConditionalNo
Warranty, partsn/a5 yr
Warranty, compressorn/a10 yr
ENERGY STAR Cold ClimateYesYes
ENERGY STARYesYes
RefrigerantR-32R-454B
Watch out forThe listing says "Pre-Charged", but Della's FAQ says the lines are not pre-vacuumed; it is a flare-and-vacuum install. Della's printed manual says the extended warranty is for professional installation; the current web policy gives registered DIY installs replacement parts at Della's discretion. Screenshot it the day you buy. Della also sells Vario, Optima Pro, Hyper Heat and older R410A lines; most owner reports are about those.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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