SplitAtlas

Cooper & Hunter / One-Way Cassette

Cooper Hunter One-Way Cassette 9k Regular R-454B 208/230V Mini-Split

Certified capacity
9,000 BTU/h[2]
SEER2
22.1 SEER2[2]
Heating floor
-13 F[1]
Voltage
230 V[1]
Install path
Professional install

The standard-outdoor 9k one-way cassette certifies at 22.1 SEER2 and 11.8 HSPF2, rated to -13F, with 9,000 BTU cooling and 11,000 heating - marginally more heat than the hyper version, interestingly.

The hyper version is the better unit on efficiency (24 against 22.1 SEER2) and cold range. This one is cheaper and still heats well at 11.8 HSPF2. In a mild climate it is the sensible pick.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Cooper & Hunter 9000 BTU one-way ceiling cassette for an R-454B mini-split system.

Image: Cooper & Hunter official CH-RSH06-12MCT1W product page

Data completeness: 92%
Last sourced
Aug 2, 2026

SplitAtlas score

8.0 / 10

Methodology
Cooling efficiencyBelow average

(22.1 SEER2) among <=9k systems

Heating efficiencyAbove average

(11.8 HSPF2) among <=9k systems

Cold-weather performanceBelow average

(72.7% heat retained at 5F; -13 F heating floor) among <=9k 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

9,000BTU/h[2]

Rated heating

11,000BTU/h[2]

Buyer review snapshot

Best for / skip if

Best for

  • High-efficiency shortlists; SEER2 is 22.1.

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
3
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: -13 F.

Strengths

  • 11,000 BTU of heating - the highest of the 9k one-way pair.
  • 11.8 HSPF2 without paying the hyper premium.
  • Shallow housing for tight ceiling cavities.

Weaknesses

  • 22.1 SEER2 trails the hyper version's 24 by nearly two points.
  • -13F rating; cold climates want the hyper version.
  • Directional throw makes placement less forgiving than a four-way head.

Climate suitability

Minimum heating ambient
-13 F[1]
Rated heating at 5F
8,000 BTU/h[2]
Rated heating at 17F
7,900 BTU/h[2]
Rated heating at 47F
11,000 BTU/h[2]

Specifications

Show
Manufacturer
Cooper & Hunter
Brand
Cooper & Hunter
Product line
One-Way Cassette
Model number
CH-RSH06-12MCT1W indoor / CH-RES09-230VO outdoor
Indoor unit model
CH-RSH06-12MCT1W
Outdoor unit model
CH-RES09-230VO
Number of zones
1
Max indoor units
not published
Rated cooling capacity
9,000 BTU/h[2]
Rated heating capacity
11,000 BTU/h[2]
Voltage
230 V[1]
MCA
12 A[1]
Maximum fuse or breaker size
15 A[1]
Breaker needed
not published
SEER2
22.1 SEER2[2]
EER2
14.4 EER2[2]
HSPF2 (Region 4)
11.8 HSPF2[2]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
2.18 COP[2]
Minimum outdoor heating temperature
-13 F[1]
Minimum outdoor cooling temperature
-13 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[2]
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[1]
Energy Star status
ENERGY STAR certified[2]
AHRI certification number
215864248[2]
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 215864248, One Way Cassette Installation Manual, Cooper & Hunter Multi R installation manual, Cooper & Hunter One-Way Cassette official product pages for CH-RSH06-12MCT1W, Owner's Manual One Way Cassette, Cooper & Hunter support-material submittal for CH-RES09-230VO + CH-RSH06-12MCT1W
Specification sheet
Cooper & Hunter support-material submittal for CH-RES09-230VO + CH-RSH06-12MCT1W
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 One-Way Ceiling Cassette 9,000 BTU R-454B 208/230V (CH-RSH06-12MCT1W / CH-RES09-230VO) myself, or do I need a pro?
Cooper & Hunter One-Way Ceiling Cassette 9,000 BTU R-454B 208/230V (CH-RSH06-12MCT1W / CH-RES09-230VO) 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 One-Way Ceiling Cassette 9,000 BTU R-454B 208/230V (CH-RSH06-12MCT1W / CH-RES09-230VO) keep heating in a cold winter?
The manufacturer publishes 8,000 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 11.8 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 One-Way Ceiling Cassette 9,000 BTU R-454B 208/230V (CH-RSH06-12MCT1W / CH-RES09-230VO) 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 One-Way Ceiling Cassette 9,000 BTU R-454B 208/230V (CH-RSH06-12MCT1W / CH-RES09-230VO) 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-RHP12-230VO + CH-RSH06-12MCT1WSourced - manufacturer technical document

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

  2. 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

  3. 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