SplitAtlas

Della / Serena Series

Della Serena 12k R-32 115V Mini-Split

Certified capacity
12,000 BTU/h[3]
SEER2
22 SEER2[3]
Heating floor
5 F[1]
Voltage
115 V[1]
Install path
Professional install / DIY-marketed

The Serena 12k on 115V sits just below Della's premium tier, offering high efficiency and rebate eligibility on a household plug. It rates SEER2 22, EER2 12, and HSPF2 9.5, heating 12,300 BTU/h at 47F and 9,200 BTU/h at 5F. It is a strong efficient-and-certified 1-ton option for a standard circuit.

1 zoneProfessional install / DIY-marketedCurrent

Refrigerant generation

R-32 - current-generation refrigerant

Paid link

$800 / Fresh price - checked Jul 24, 2026

Check price at Della

Need this installed?

Get installation quotes
Error Codes
Della Serena 12,000 BTU R-32 115V (048-MS-12K1VR-22S-M-IN / 048-MS-12K1VR-22S-M-OUT) mini-split heat pump indoor wall unit and outdoor condenser

Image: Della

Data completeness: 93%
Last sourced
Jul 24, 2026

SplitAtlas score

8.2 / 10

Methodology
Cooling efficiencyBelow average

(22.0 SEER2) among 12k systems

Heating efficiencyBelow average

(9.5 HSPF2) among 12k systems

Cold-weather performanceBelow average

(74.8% heat retained at 5F; 5 F heating floor) among 12k systems

NoiseBelow average

(23 dBA indoor min / 53 dBA outdoor) among 12k systems

Installation accessibilityTop quartile

(DIY-marketed; 25 ft precharged; 16 ft included line set) across the catalogue

Feature setAbove average

(5 verified features) across the catalogue

Price-to-performanceTop 10%

($800 median retail) among 12k systems

Documentation & partsBelow average

(3 manuals; spec sheet) across the catalogue

Key ratings

Rated cooling

12,000BTU/h[3]

Rated heating

12,300BTU/h[3]

Buyer review snapshot

Best for / skip if

Best for

  • High-efficiency shortlists; SEER2 is 22.

Install difficulty

Professional flared-line install
  • Electrical: 115V; breaker/fuse 25 A.
  • Line set: Flared line connections; precharged 25 ft; included 16 ft; max 65.6 ft.

Alternatives

Availability and price context

  • Verified current price: $799.96 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

Review methodology

Strengths

  • SEER2 22 with EER2 12 is efficient cooling for a 1-ton unit.
  • ENERGY STAR certified, so it can qualify for utility rebates.
  • Runs on a standard 115V circuit with low-GWP R-32 refrigerant.

Weaknesses

  • Della is a newer DIY-oriented value brand with a thinner service network than premium legacy names.
  • Higher startup current on a shared 115V circuit can be an issue on a loaded line.

Climate suitability

Minimum heating ambient
5 F[1]
Rated heating at 5F
9,200 BTU/h[3]
Rated heating at 17F
9,500 BTU/h[3]
Rated heating at 47F
12,300 BTU/h[3]

Specifications

Show
Manufacturer
Della
Brand
Della
Product line
Serena Series
Model number
048-MS-12K1VR-22S-M-IN indoor / 048-MS-12K1VR-22S-M-OUT outdoor
Indoor unit model
048-MS-12K1VR-22S-M-IN
Outdoor unit model
048-MS-12K1VR-22S-M-OUT
Number of zones
1
Max indoor units
not published
Rated cooling capacity
12,000 BTU/h[3]
Rated heating capacity
12,300 BTU/h[3]
Voltage
115 V[1]
MCA
not published - manufacturer specifies 25 A breaker
Maximum fuse or breaker size
25 A[1]
Breaker needed
25 A[1]
SEER2
22 SEER2[3]
EER2
12 EER2[3]
HSPF2 (Region 4)
9.5 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
2.1 COP[3]
Minimum outdoor heating temperature
5 F[1]
Minimum outdoor cooling temperature
not published
Maximum outdoor temperature
125 F[1]
Indoor noise range
23 - 41 dBA[2]
Outdoor noise rating
53 dBA[2]
Indoor weight
18.3 lb[1]
Outdoor weight
52.9 lb[1]
Refrigerant
R-32[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
1/4 in liquid / 3/8 in suction
Included line-set length
16 ft[1]
Maximum line-set length
65.6 ft[2]
Max line set per indoor
not published
Maximum elevation difference
49.2 ft[2]
Max height between indoor units
not published
Wi-Fi support
supported[1]
Energy Star status
ENERGY STAR certified[4]
AHRI certification number
216760019[3]
Warranty
not published
Install path
Professional install / DIY-marketed
Marketing install label
DIY-marketed
Retail price
$799.96
Available retailers
Della
Manual links
AHRI Appendix M1 public detail record 216760019, Serena Series installation and operation guide, Serena 12,000 BTU Della product-page specifications
Specification sheet
Serena 12,000 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

$800 / Fresh price - checked Jul 24, 2026

Electrical requirements

Show
Voltage
115 V[1]
Voltage range
115V[1]
Phase
1[1]
Frequency
not published
MCA
not published - manufacturer specifies 25 A breaker
Breaker needed
25 A[1]
Maximum breaker size
not published
Maximum fuse size
25 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
not published

Installation considerations

Show
Liquid line
1/4 in[1]
Suction line
3/8 in[1]
Line connection type
Flared line connections[2]
Precharged length
25 ft[2]
Included line-set length
16 ft[1]
Maximum line-set length
65.6 ft[2]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
32.56 in W x 11.77 in H x 7.87 in D[1]
Outdoor dimensions
27.76 in W x 20.87 in H x 10.98 in D[1]
Indoor weight
18.3 lb[1]
Outdoor weight
52.9 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Della Serena 12,000 BTU R-32 115V (048-MS-12K1VR-22S-M-IN / 048-MS-12K1VR-22S-M-OUT) myself, or do I need a pro?
Della Serena 12,000 BTU R-32 115V (048-MS-12K1VR-22S-M-IN / 048-MS-12K1VR-22S-M-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 Serena 12,000 BTU R-32 115V (048-MS-12K1VR-22S-M-IN / 048-MS-12K1VR-22S-M-OUT) keep heating in a cold winter?
The manufacturer publishes 9,200 BTU/h of heating output at 5F. Rated heating operation extends down to 5 F. Certified heating efficiency is 9.5 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 Serena 12,000 BTU R-32 115V (048-MS-12K1VR-22S-M-IN / 048-MS-12K1VR-22S-M-OUT) need?
Published electrical requirements: 115 V voltage, not published - manufacturer specifies 25 A breaker minimum circuit ampacity, and 25 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 65.6 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

Show
  1. Della: DELLA Serena Series 12000 BTU 22 SEER2 Mini-Split Heat Pump AC - Up to 550 Sq.Ft. official product pageSourced - manufacturer product page

    Covers Breaker needed, Maximum fuse size, Phase, Voltage, Voltage range, Included line-set length and more

  2. Della: Serena Series installation and operation guideSourced - manufacturer technical document

    Covers Indoor noise range, Line connection type, Maximum elevation difference, Maximum line-set length, Outdoor noise rating, Precharged length

  3. AHRI certificate #216760019 - 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

  4. ENERGY STAR: ENERGY STAR exact row check for AHRI 215864147Sourced - Energy Star listing

    Covers Energy Star status

Last updated

Jul 24, 2026