Della / Optima CloudAir Series
Della Optima CloudAir 18k R-454B 208/230V Mini-Split
The Optima CloudAir 18k is a premium 1.5-ton unit with smart controls and strong cold-weather retention. It rates SEER2 23, EER2 12.5, and HSPF2 10, heating 19,000 BTU/h at 47F and holding 13,600 BTU/h at 5F. It fits a medium space where efficiency, connectivity, and cold performance all matter.
1 zoneProfessional install / DIY-marketedCurrent
Refrigerant generation
R-454B - current-generation refrigerant
Paid link
$1,435 / Fresh price - checked Jul 24, 2026
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Image: Della
Data completeness: 93%
- Last sourced
- Jul 24, 2026
SplitAtlas score
8.1 / 10
Cooling efficiencyAbove average
(23.0 SEER2) among 18k systems
Heating efficiencyBelow average
(10.0 HSPF2) among 18k systems
Cold-weather performanceBelow average
(71.6% heat retained at 5F; -13 F heating floor) among 18k systems
NoiseBottom quartile
(34 dBA indoor min / 53 dBA outdoor) among 18k systems
Feature setAbove average
(5 verified features) across the catalogue
Price-to-performanceAbove average
($1,435 median retail) among 18k systems
Documentation & partsBelow average
(3 manuals; spec sheet) across the catalogue
Key ratings
Buyer review snapshot
Best for / skip if
Best for
- High-efficiency shortlists; SEER2 is 23.
Install difficulty
Professional flared-line install
- Electrical: 230V; breaker/fuse 20 A.
- Line set: Flared line connections; precharged 25 ft; max 65 ft.
Alternatives
- Blueridge XS6 Max Efficiency 18,000 BTU R-454B 208/230V (BXS6A18WM0 / BXS6A18UC0)
9.0 score / 18k / SEER2 25.6 / -22 F heating floor / 230V
Exact destination at Alpine Home Air: $2,359.00, checked Jul 24, 2026
- Senville ELITE 18,000 BTU R-454B 208/230V (SENE-18EL-IHH / SENE-18EL-OH)
8.9 score / 18k / SEER2 25.6 / -22 F heating floor / 187-253V
Exact destination at Senville: $1,899.99, checked Jul 24, 2026
- ACiQ Standard 18,000 BTU R-454B 208/230V (ACIQ-18WS-HP230C / ACIQ-18ZS-HP230C)
8.8 score / 18k / SEER2 24 / -13 F heating floor / 230V
Exact destination at HVACDirect: $1,299.99, checked Jul 26, 2026
Availability and price context
- Verified current price: $1,434.96 at Della; availability in_stock; checked Jul 24, 2026.
Source date
- Model data sourced
- Jul 24, 2026
- Page reviewed
- Jul 24, 2026
- Source-backed records
- 4
- Newest source retrieved
- Jul 24, 2026
Strengths
- Keeps 13,600 BTU/h at 5F, a strong hold for a 1.5-ton unit.
- SEER2 23 with HSPF2 10 is efficient in both modes, and it is ENERGY STAR certified.
- CloudAir smart/WiFi control plus low-GWP R-454B refrigerant.
Weaknesses
- Della's newer value-brand status means fewer local service options than premium legacy names.
- Professional install is recommended; DIY refrigerant errors can affect warranty coverage.
Climate suitability
- Minimum heating ambient
- -13 F[1]
- Rated heating at 5F
- 13,600 BTU/h[3]
- Rated heating at 17F
- 15,000 BTU/h[3]
- Rated heating at 47F
- 19,000 BTU/h[3]
Specifications
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- Manufacturer
- Della
- Brand
- Della
- Product line
- Optima CloudAir Series
- Model number
- 048-C-TP-18K2V-C-IN indoor / 048-C-TP-18K2V-23S-OUT outdoor
- Indoor unit model
- 048-C-TP-18K2V-C-IN
- Outdoor unit model
- 048-C-TP-18K2V-23S-OUT
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 18,000 BTU/h[3]
- Rated heating capacity
- 19,000 BTU/h[3]
- Voltage
- 230 V[1]
- MCA
- not published - manufacturer specifies 20 A breaker
- Maximum fuse or breaker size
- 20 A[1]
- Breaker needed
- 20 A[1]
- SEER2
- 23 SEER2[3]
- EER2
- 12.5 EER2[3]
- HSPF2 (Region 4)
- 10 HSPF2[3]
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 1.8 COP[3]
- Minimum outdoor heating temperature
- -13 F[1]
- Minimum outdoor cooling temperature
- not published
- Maximum outdoor temperature
- 131 F[1]
- Indoor noise range
- 34 - 50 dBA[2]
- Outdoor noise rating
- 53 dBA[2]
- Indoor weight
- 30.9 lb[1]
- Outdoor weight
- 90.4 lb[1]
- Refrigerant
- R-454B[3]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 1/2 in suction
- Included line-set length
- Della sells this certified pair with selectable line-set kit lengths, including a no-line-set SKU; no fixed included line-set length applies.
- Maximum line-set length
- 65 ft[2]
- Max line set per indoor
- not published
- Maximum elevation difference
- 49 ft[2]
- Max height between indoor units
- not published
- Wi-Fi support
- supported[1]
- Energy Star status
- ENERGY STAR certified[4]
- AHRI certification number
- 218640160[3]
- Warranty
- not published
- Install path
- Professional install / DIY-marketed
- Marketing install label
- DIY-marketed
- Retail price
- $1,434.96
- Available retailers
- Della
- Manual links
- AHRI Appendix M1 public detail record 218640160, Optima CloudAir Series installation and operation guide, Optima CloudAir 18,000 BTU Della product-page specifications
- Specification sheet
- Optima CloudAir 18,000 BTU Della product-page specifications
- Last sourced date
- Jul 24, 2026
Retail purchase context
Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure
Paid link
Check price at Della
$1,435 / Fresh price - checked Jul 24, 2026
Electrical requirements
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- Voltage
- 230 V[1]
- Voltage range
- 208/230V[1]
- Phase
- 1[1]
- Frequency
- not published
- MCA
- not published - manufacturer specifies 20 A breaker
- Breaker needed
- 20 A[1]
- Maximum breaker size
- not published
- Maximum fuse size
- 20 A[1]
- Maximum cooling current
- not published
- Maximum heating current
- not published
- Manufacturer wire notes
- not published
Installation considerations
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- Liquid line
- 1/4 in[2]
- Suction line
- 1/2 in[2]
- Line connection type
- Flared line connections[2]
- Precharged length
- 25 ft[2]
- Included line-set length
- Della sells this certified pair with selectable line-set kit lengths, including a no-line-set SKU; no fixed included line-set length applies.
- Maximum line-set length
- 65 ft[2]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 43.18 in W x 8.74 in H x 13.07 in D[1]
- Outdoor dimensions
- 36.5 in W x 27.52 in H x 14.96 in D[1]
- Indoor weight
- 30.9 lb[1]
- Outdoor weight
- 90.4 lb[1]
- Drain size
- not published
Related systems and guides
- More Della systems
- Della Motto Series 18k 230V
- Della Optima Pro Series 18k 230V
- Daikin comparison model
- Della sibling model
- Guide library
- Mini split buying guide
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- Troubleshooting
- Do mini splits work in cold weather?
- Della mini split review: is Della any good?
- The best 18,000 BTU mini splits of 2026
- The best cold-climate mini splits of 2026
- The best mini splits for heating of 2026
- Mini split heating capacity in the cold: what your unit actually delivers at 5F
- The mini split defrost cycle, explained
- The best DIY mini splits of 2026
- What "DIY mini split" actually means
- How to install a mini split (DIY overview)
- Mini split not heating
- Mini split indoor unit freezing up
- Mini split remote not working
- Mini split smells bad
- Mini split Wi-Fi not connecting
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Della Optima CloudAir 18,000 BTU R-454B 208/230V (048-C-TP-18K2V-C-IN / 048-C-TP-18K2V-23S-OUT) myself, or do I need a pro?
- Della Optima CloudAir 18,000 BTU R-454B 208/230V (048-C-TP-18K2V-C-IN / 048-C-TP-18K2V-23S-OUT) is built for professional installation: the line set must be flared, evacuated, and charged, which requires EPA-certified refrigerant handling. Installing it outside the manufacturer's requirements can void the warranty, so budget for a qualified HVAC installer.
- Will the Della Optima CloudAir 18,000 BTU R-454B 208/230V (048-C-TP-18K2V-C-IN / 048-C-TP-18K2V-23S-OUT) keep heating in a cold winter?
- The manufacturer publishes 13,600 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 10 HSPF2. Match those numbers against your climate's design temperature - in cold regions, output at 5F matters far more than the nameplate capacity measured at 47F.
- What electrical circuit does the Della Optima CloudAir 18,000 BTU R-454B 208/230V (048-C-TP-18K2V-C-IN / 048-C-TP-18K2V-23S-OUT) need?
- Published electrical requirements: 230 V voltage, not published - manufacturer specifies 20 A breaker minimum circuit ampacity, and 20 A maximum breaker or fuse sizing. Confirm the final circuit against the unit nameplate and local code with a licensed electrician.
- How far can the outdoor unit be from the indoor head?
- The published maximum line-set length is 65 ft, and the included line set comes pre-charged for 25 ft. Longer runs than the included set allows typically mean added refrigerant and a pro visit, so measure the planned routing before ordering.
Data sources
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- Della: DELLA Optima CloudAir Series 18000 BTU 23 SEER2 Ultra Heat Mini Split AC - Up to 1000 Sq.Ft. official product pageSourced - manufacturer product page
Covers Breaker needed, Maximum fuse size, Phase, Voltage, Voltage range, Indoor dimensions and more
- Della: Optima CloudAir Series installation and operation guideSourced - manufacturer technical document
Covers Indoor noise range, Line connection type, Liquid line size, Maximum elevation difference, Maximum line-set length, Outdoor noise rating and more
- AHRI certificate #218640160 - search the AHRI DirectorySourced - AHRI directory
Covers AHRI certification number, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity, HSPF2 (Region 4) and more
- ENERGY STAR: ENERGY STAR exact row check for AHRI 215864147Sourced - Energy Star listing
Covers Energy Star status
Last updated
Jul 24, 2026