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SpecDella Serena 12,000 BTU 115VSenville Elite 12,000 BTU 230V
PhotoDella Serena 12,000 BTU 115VSenville Elite 12,000 BTU 230V
Our scoreSCORE7.3 / 10SCORE7.6 / 10
Our takeThe most 5°F heat of the 115V 12k units we cover, 9,200 BTU/h, with ENERGY STAR Cold Climate status. You still need a vacuum pump or a tech for the startup.13,500 Btu/h at 5°F and 7,500 max at -22°F, the most cold-night heat of any 12K we review. Licensed install required for the 10/10 warranty.
Nominal size12,000 BTU12,000 BTU
Voltage115V230V
Rated heat at 47°F12,300 BTU/h12,000 BTU/h
Heat at 17°F9,500 BTU/h11,000 BTU/hbest
Heat at 5°F9,200 BTU/h13,500 BTU/hbest
Lowest heating temp5°F-22°Fbest
Max heat at lowest tempn/a7,500 BTU/h
SEER22229.4best
HSPF2 (Region IV)9.512.7best
Install typeFlareFlare
Line set in box16.4 ftbest16 ft
Max line run65.6 ft82 ftbest
Warranty covers owner installConditionalNo
Warranty, partsn/a10 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 FAQ says no to owner installs; warranty registration asks for the installing company and invoice. Senville's site lists higher HSPF2 than the AHRI figures on NEEP; we use the certified numbers.
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