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Della mini-split heat pumps

ENERGY STAR lists 47 Della outdoor units in 68 certified indoor pairings; 65 pairings (95%) carry the cold-climate designation. Refrigerants: R-454B (52), R-32 (10), R-410A (6).

Outdoor unit	Pairings	Cooling BTU/h	Best SEER2	Best HSPF2	Best % at 5°F	Cold climate	Refrigerant	Top record
048-C-TP-9K1V-24S-OUT	1	9,000–9,000	23	9.5	71%	Yes	R-454B	4663297
048-C-TP-9K2V-24S-OUT	1	9,000–9,000	23	9.5	71%	Yes	R-454B	4663296
048-C-TPH-9K2V-25S-OUT	1	9,000–9,000	25	10.5	101%	Yes	R-454B	4663291
048-TL-9K1VB-19S-OUT	1	9,000–9,000	19	9.5	73%	Yes	R-454B	4470787
048-TL-9K2VB-20S-OUT	1	9,000–9,000	20	10	74%	Yes	R-454B	4470788
048-TP-9K1V-23S-OUT	2	9,000–9,000	23	9.5	74%	Yes	R-410A, R-454B	4623910
048-TP-9K1V-24S-OUT	2	9,000–9,000	23	9.5	71%	Yes	R-454B	4470789
048-TP-9K2V-23S-OUT	1	9,000–9,000	23.5	9.2	77%	Yes	R-410A	3436377
048-TP-9K2V-24S-OUT	4	9,000–9,500	23	10.5	78%	Yes	R-454B	4470803
048-TPH-9K2V-25S-OUT	2	9,000–9,000	25	10.5	101%	Yes	R-454B	4470800
048-TP-12K2V-24S-OUT	4	11,000–12,000	24	10	75%	Yes	R-454B	4470792
048-C-TP-12K1V-23S-OUT	1	12,000–12,000	23	10	72%	Yes	R-454B	4663295
048-C-TP-12K2V-24S-OUT	1	12,000–12,000	24	10	72%	Yes	R-454B	4663294
048-C-TPH-12K2V-25S-OUT	1	12,000–12,000	25	10.5	100%	Yes	R-454B	4663290
048-MS-12K1VR-22S-M-OUT	1	12,000–12,000	22	9.5	75%	Yes	R-32	3943017
048-MS-12K2VR-21S-OUT	1	12,000–12,000	21	10	67%	No	R-32	3478160
048-MS-12K2VR-22S-M-OUT	1	12,000–12,000	22	9.5	74%	Yes	R-32	3943018
048-TP-12K1V-22S-OUT	1	12,000–12,000	22	9	72%	Yes	R-410A	3436376
048-TP-12K1V-23S-OUT	2	12,000–12,000	23	10	72%	Yes	R-454B	4470790
048-TP-12K2V-23S-OUT	1	12,000–12,000	23	9.5	76%	Yes	R-410A	3436378
048-TPH-12K2V-25S-OUT	2	12,000–12,000	25	10.5	100%	Yes	R-454B	4470801
048-TP-18K2V-23S-OUT	5	16,000–18,000	23	10	73%	Yes	R-454B	4470793
048-MS-18K-MODU	1	17,700–17,700	22	10	81%	Yes	R-32	4016097
048-C-TP-18K2V-23S-OUT	1	18,000–18,000	23	10	72%	Yes	R-454B	4663293
048-C-TPH-18K2V-23S-OUT	1	18,000–18,000	23.5	10	99%	Yes	R-454B	4663289
048-MS-18K2VR-22S-M-OUT	1	18,000–18,000	22	9.5	75%	Yes	R-32	3943019
048-TCQ-MODU-1D2	1	18,000–18,000	25	10	78%	Yes	R-32	4623919
048-TLP-MODU-1D2	1	18,000–18,000	20	9	79%	Yes	R-454B	4470795
048-TP-18K2V-22S-OUT	1	18,000–18,000	22	9	66%	No	R-410A	3423455
048-TPH-18K2V-23S-OUT	2	18,000–18,000	23.5	10	99%	Yes	R-454B	4470797
048-TPH-MODU-1D3	1	20,000–20,000	27	10	99%	Yes	R-454B	4623904
048-TP-23K2V-23S-OUT	5	22,000–23,000	23	10.4	76%	Yes	R-454B	4470806
048-C-TP-23K2V-23S-OUT	1	23,000–23,000	23	9.5	74%	Yes	R-454B	4663292
048-MS-24K2VR-22S-M-OUT	1	23,000–23,000	22	10	87%	Yes	R-32	3943021
048-TP-24K2V-20S-OUT	1	23,000–23,000	20	9	67%	No	R-410A	3423456
048-C-TPH-24K2V-23S-OUT	1	24,000–24,000	22.5	10	93%	Yes	R-454B	4663288
048-TPH-24K2V-23S-OUT	2	24,000–24,000	22.5	10	93%	Yes	R-454B	4470802
048-TLP-MODU-1D3	1	27,000–27,000	21	9	70%	Yes	R-454B	4470796
048-TPH-MODU-1D4	1	27,000–27,000	26.5	10.5	96%	Yes	R-454B	4623903
048-TCQ-MODU-1D3	1	28,000–28,000	22	10	75%	Yes	R-32	4623918
048-TLP-MODU-1D4	1	34,000–34,000	20.5	10.5	71%	Yes	R-454B	4470798
048-TPH-MODU-1D5	1	36,000–36,000	25	10	83%	Yes	R-454B	4623902
048-TCQ-MODU-1D4	1	38,000–38,000	23	10	74%	Yes	R-32	4623917
048-TLP-MODU-1D5	1	41,000–41,000	19.5	9	79%	Yes	R-454B	4470799
048-TCQ-MODU-1D5	1	42,000–42,000	24	10	74%	Yes	R-32	4623916
048-TPH-MODU-1D6	1	48,000–48,000	24	10	88%	Yes	R-454B	4623901
048-TLP-MODU-1D6	1	55,000–55,000	22.5	9.5	76%	Yes	R-454B	4623915

Best values across pairings; open a unit page (DIY brands) or the ENERGY STAR record for each pairing.

See Della on the manufacturer's site (plain link, not an affiliate link)