SplitAtlas

Cooper & Hunter / Slim Duct

Cooper Hunter Slim Duct 12k Hyper Concealed Ducted R-454B 208/230V Mini-Split

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

The hyper 12k slim-duct head certifies at 20 SEER2 with a full 12,000 BTU of cooling and 12,500 of heating, rated to -22F. HSPF2 is 10 - a noticeable drop from the 12.5 of the 9k version of the same head.

That heating-efficiency drop is the pattern across this head: it is at its best at the smallest capacities. If the room is borderline between 9k and 12k, the 9k pairing is materially the better machine on both efficiency figures.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Cooper & Hunter 12000 BTU medium-static slim duct indoor unit for an R-454B mini-split system.

Image: Cooper & Hunter official CH-RS06-12MDT-MS product page

Data completeness: 92%
Last sourced
Aug 2, 2026

SplitAtlas score

8.1 / 10

Methodology
Cooling efficiencyBelow average

(20.0 SEER2) among 12k systems

Heating efficiencyBelow average

(10.0 HSPF2) among 12k systems

Cold-weather performanceTop quartile

(94.4% heat retained at 5F; -22 F heating floor) among 12k systems

WarrantyBelow average

(5 yr parts / 7 yr compressor) across the catalogue

Feature setAbove average

(6 verified features) across the catalogue

Documentation & partsBelow average

(6 manuals; spec sheet) across the catalogue

Not evaluated

  • Installation accessibility — not applicable (professional install)N/A

    professional install - DIY-accessibility not applicable

  • Price-to-value — not evaluatedN/A

    This is a professionally installed, quote-only system, so we can't score its price. Get an installed quote to compare real cost.

    Get a quote

Key ratings

Rated cooling

12,000BTU/h[3]

Rated heating

12,500BTU/h[3]

Buyer review snapshot

Install difficulty

Professional flared-line install
  • Electrical: 230V; MCA 12 A; breaker/fuse 15 A.
  • Line set: Flared line connections; precharged 25 ft; max 82 ft.

Alternatives

Availability and price context

We could not verify a current retail price for this model. We do not currently have a verified in-stock offer from a retailer we work with when we last checked on 2026-08-02.

Source date

Model data sourced
Aug 2, 2026
Page reviewed
Aug 2, 2026
Source-backed records
4
Newest source retrieved
Aug 2, 2026

Warranty tiers

Warranty: 5 years parts and 7 years compressor as standard.

Review methodology

Model context

Structured ratings
Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -22 F.

Strengths

  • Full 12,000 BTU cooling and 12,500 heating, with a -22F rating.
  • Completely concealed installation.
  • A point of SEER2 ahead of the standard-outdoor version.

Weaknesses

  • 10 HSPF2, well down on the 12.5 of the 9k version of the same head.
  • Low-static head; duct design determines real-world performance.
  • Concealed servicing is easily neglected.

Climate suitability

Minimum heating ambient
-22 F[1]
Rated heating at 5F
11,800 BTU/h[3]
Rated heating at 17F
9,600 BTU/h[3]
Rated heating at 47F
12,500 BTU/h[3]

Specifications

Show
Manufacturer
Cooper & Hunter
Brand
Cooper & Hunter
Product line
Slim Duct
Model number
CH-RS06-12MDT-MS indoor / CH-RHP12-230VO outdoor
Indoor unit model
CH-RS06-12MDT-MS
Outdoor unit model
CH-RHP12-230VO
Number of zones
1
Max indoor units
not published
Rated cooling capacity
12,000 BTU/h[3]
Rated heating capacity
12,500 BTU/h[3]
Voltage
230 V[1]
MCA
12 A[1]
Maximum fuse or breaker size
15 A[1]
Breaker needed
not published
SEER2
20 SEER2[3]
EER2
12 EER2[3]
HSPF2 (Region 4)
10 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
1.9 COP[3]
Minimum outdoor heating temperature
-22 F[1]
Minimum outdoor cooling temperature
-22 F[1]
Maximum outdoor temperature
122 F[1]
Indoor noise range
not published
Outdoor noise rating
52.5 dBA[1]
Indoor weight
not published
Outdoor weight
62.17 lb[1]
Refrigerant
R-454B[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
1/4 in liquid / 3/8 in suction
Included line-set length
C&H cassette and slim-duct systems are professional-install equipment; the installer supplies the refrigerant line set within published piping limits.
Maximum line-set length
82 ft[1]
Max line set per indoor
not published
Maximum elevation difference
49.2 ft[1]
Max height between indoor units
not published
Wi-Fi support
supported[2]
Energy Star status
ENERGY STAR certified[3]
AHRI certification number
215864217[3]
Warranty
Standard: 5 yr parts / 7 yr compressor (licensed-technician installation and registration terms). 7-year compressor and 5-year parts limited warranty with licensed-technician installation and registration terms.
Install path
Professional install
Retail price
We do not currently have a verified in-stock offer from a retailer we work with when we last checked on 2026-08-02.
Available retailers
not published
Manual links
AHRI Active public directory row 215864217, Installation Manual - Medium/High Static Duct, Cooper & Hunter Multi R installation manual, Cooper & Hunter Slim Duct official product pages for CH-RS06-12MDT-MS, Owner's Manual - Medium/High Static Duct, Cooper & Hunter support-material submittal for CH-RHP12-230VO + CH-RS06-12MDT-MS
Specification sheet
Cooper & Hunter support-material submittal for CH-RHP12-230VO + CH-RS06-12MDT-MS
Last sourced date
Aug 2, 2026

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
12 A[1]
Breaker needed
not published
Maximum breaker size
15 A[1]
Maximum fuse size
15 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
Field wiring per C&H support-material submittal and local electrical code.[1]

Installation considerations

Show
Liquid line
1/4 in[1]
Suction line
3/8 in[1]
Line connection type
Flared line connections[1]
Precharged length
25 ft[1]
Included line-set length
C&H cassette and slim-duct systems are professional-install equipment; the installer supplies the refrigerant line set within published piping limits.
Maximum line-set length
82 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
not published
Outdoor dimensions
30.12 x 11.93 x 21.85 in[1]
Indoor weight
not published
Outdoor weight
62.17 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Cooper & Hunter Slim Duct 12,000 BTU R-454B 208/230V (CH-RS06-12MDT-MS / CH-RHP12-230VO) myself, or do I need a pro?
Cooper & Hunter Slim Duct 12,000 BTU R-454B 208/230V (CH-RS06-12MDT-MS / CH-RHP12-230VO) 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 Cooper & Hunter Slim Duct 12,000 BTU R-454B 208/230V (CH-RS06-12MDT-MS / CH-RHP12-230VO) keep heating in a cold winter?
The manufacturer publishes 11,800 BTU/h of heating output at 5F. Rated heating operation extends down to -22 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 Cooper & Hunter Slim Duct 12,000 BTU R-454B 208/230V (CH-RS06-12MDT-MS / CH-RHP12-230VO) need?
Published electrical requirements: 230 V voltage, 12 A minimum circuit ampacity, and 15 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 82 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.
What warranty does the Cooper & Hunter Slim Duct 12,000 BTU R-454B 208/230V (CH-RS06-12MDT-MS / CH-RHP12-230VO) carry?
The manufacturer publishes these warranty tiers: Standard: 5 yr parts / 7 yr compressor (licensed-technician installation and registration terms). Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. Cooper & Hunter: Cooper & Hunter support-material submittal for CH-RES12-230VO + CH-RS06-12MDT-MSSourced - manufacturer technical document

    Covers Frequency, electrical_spec.guaranteed_voltage_range, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase and more

  2. Cooper & Hunter: Cooper & Hunter support-material submittal for CH-RES12-230VO + CH-RS06-12MDT- MSSourced - manufacturer technical document

    Covers Wi-Fi support, Form factor

  3. Air-Conditioning, Heating, and Refrigeration Institute: AHRI Active Cooper & Hunter form-factor row 215864231Sourced - AHRI directory

    Covers AHRI certification number, performance_spec.cold_climate_designation, Rated cooling capacity, COP at 5F, EER2, Energy Star status and more

  4. Cooper & Hunter: Cooper & Hunter Multi R installation manual limited warranty sectionSourced - manufacturer technical document

    Covers Legacy compressor warranty value, Legacy warranty value, Standard compressor warranty, Standard warranty conditions, Standard parts warranty, Warranty notes

Last updated

Aug 2, 2026