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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.

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SpecSenville Aura 24,000 BTU 230VDella Serena 24,000 BTU 230V
PhotoSenville Aura 24,000 BTU 230VDella Serena 24,000 BTU 230V
Our scoreSCORE7.5 / 10SCORE7.3 / 10
Our takeFor 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.Keeps 87% of its rating at 5°F, the best retention in the Serena line, for a bigger shop where winters stay above 5°F.
Nominal size24,000 BTU24,000 BTU
Voltage230V230V
Rated heat at 47°F29,000 BTU/h24,000 BTU/h
Heat at 17°F22,200 BTU/h22,400 BTU/hbest
Heat at 5°F24,200 BTU/hbest20,800 BTU/h
Lowest heating temp-22°Fbest5°F
Max heat at lowest temp11,900 BTU/hn/a
SEER2n/a22
HSPF2 (Region IV)13.5best10
Install typeFlareFlare
Line set in boxn/a16.4 ft
Max line run164 ftbest98.4 ft
Warranty covers owner installNoConditional
Warranty, parts5 yrn/a
Warranty, compressor10 yrn/a
ENERGY STAR Cold ClimateYesYes
ENERGY STARYesYes
RefrigerantR-454BR-32
Watch out forSenville'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.The 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.
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