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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 Elite 9,000 BTU 230VDella Serena 9,000 BTU 115V
PhotoSenville Elite 9,000 BTU 230VDella Serena 9,000 BTU 115V
Our scoreSCORE7.6 / 10SCORE7.3 / 10
Our takeSame NEEP heat as the 12K at every temperature with 33.3 SEER2; the efficiency pick if 9,000 Btu/h of cooling is enough.Della publishes no cold-weather figures for either 9K, so we can't tell you how it heats on a cold night. The 230V version is the more efficient heater on paper.
Nominal size9,000 BTU9,000 BTU
Voltage230V115V
Rated heat at 47°F12,000 BTU/h9,800 BTU/h
Heat at 17°F11,000 BTU/hn/a
Heat at 5°F13,500 BTU/hn/a
Lowest heating temp-22°Fbest5°F
Max heat at lowest temp7,500 BTU/hn/a
SEER233.3best22
HSPF2 (Region IV)14.6best8.5
Install typeFlareFlare
Line set in box16 ft16.4 ftbest
Max line run82 ftbest65.6 ft
Warranty covers owner installNoConditional
Warranty, parts10 yrn/a
Warranty, compressor10 yrn/a
ENERGY STAR Cold ClimateYesn/a
ENERGY STARYesn/a
RefrigerantR-454BR-32
Watch out forSenville'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. Senville's 22.0 HSPF2 for the 9K is far above its AHRI certificate (14.6).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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