Cooper & Hunter / One-Way Cassette
Cooper Hunter One-Way Cassette 17k Hyper R-454B 208/230V Mini-Split
The largest hyper one-way cassette: 16,700 BTU cooling and a substantial 20,000 BTU of heating, at 20.6 SEER2 and 12.2 HSPF2, rated to -22F.
The heating figures are the reason to buy it - 20,000 BTU and 12.2 HSPF2 down to -22F is serious cold-climate capability from a single directional head. Cooling efficiency is the weakest of the one-way range, so this is a winter unit.
1 zoneProfessional installCurrent
Refrigerant generation
R-454B - current-generation refrigerant
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Data completeness: 92%
- Last sourced
- Aug 2, 2026
SplitAtlas score
8.4 / 10
Cooling efficiencyBelow average
(20.6 SEER2) among 18k systems
Heating efficiencyTop 10%
(12.2 HSPF2) among 18k systems
Cold-weather performanceAbove average
(87.5% heat retained at 5F; -22 F heating floor) among 18k 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.
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Key ratings
Buyer review snapshot
Install difficulty
Professional flared-line install
- Electrical: 230V; MCA 19 A; breaker/fuse 20 A.
- Line set: Flared line connections; precharged 25 ft; max 98.4 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
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.
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
- 20,000 BTU of heating with 12.2 HSPF2 and a -22F rating.
- Covers a long space from one end where a four-way head cannot.
Weaknesses
- 20.6 SEER2 is the weakest cooling efficiency in the one-way range.
- Cooling capacity is 16,700 BTU despite the 18k head.
- Directional throw over a long room is placement-sensitive.
Climate suitability
- Minimum heating ambient
- -22 F[1]
- Rated heating at 5F
- 17,500 BTU/h[2]
- Rated heating at 17F
- 14,500 BTU/h[2]
- Rated heating at 47F
- 20,000 BTU/h[2]
Specifications
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- Manufacturer
- Cooper & Hunter
- Brand
- Cooper & Hunter
- Product line
- One-Way Cassette
- Model number
- CH-RSH18MCT1W indoor / CH-RHP18-230VO outdoor
- Indoor unit model
- CH-RSH18MCT1W
- Outdoor unit model
- CH-RHP18-230VO
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 16,700 BTU/h[2]
- Rated heating capacity
- 20,000 BTU/h[2]
- Voltage
- 230 V[1]
- MCA
- 19 A[1]
- Maximum fuse or breaker size
- 20 A[1]
- Breaker needed
- not published
- SEER2
- 20.6 SEER2[2]
- EER2
- 12.5 EER2[2]
- HSPF2 (Region 4)
- 12.2 HSPF2[2]
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 1.89 COP[2]
- 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
- 57 dBA[1]
- Indoor weight
- not published
- Outdoor weight
- 99.87 lb[1]
- Refrigerant
- R-454B[2]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 1/2 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
- 98.4 ft[1]
- Max line set per indoor
- not published
- Maximum elevation difference
- 65.6 ft[1]
- Max height between indoor units
- not published
- Wi-Fi support
- supported[1]
- Energy Star status
- ENERGY STAR certified[2]
- AHRI certification number
- 217656829[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 217656829, One Way Cassette Installation Manual, Cooper & Hunter Multi R installation manual, Cooper & Hunter One-Way Cassette official product pages for CH-RSH18MCT1W, Owner's Manual One Way Cassette, Cooper & Hunter support-material submittal for CH-RHP18-230VO + CH-RSH18MCT1W
- Specification sheet
- Cooper & Hunter support-material submittal for CH-RHP18-230VO + CH-RSH18MCT1W
- Last sourced date
- Aug 2, 2026
Electrical requirements
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- Voltage
- 230 V[1]
- Voltage range
- 208/230V[1]
- Phase
- 1[1]
- Frequency
- 60 Hz[1]
- MCA
- 19 A[1]
- Breaker needed
- not published
- Maximum breaker size
- 20 A[1]
- Maximum fuse size
- 20 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
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- Liquid line
- 1/4 in[1]
- Suction line
- 1/2 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
- 98.4 ft[1]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- not published
- Outdoor dimensions
- 35.04 x 13.46 x 26.50 in[1]
- Indoor weight
- not published
- Outdoor weight
- 99.87 lb[1]
- Drain size
- not published
Related systems and guides
- More Cooper & Hunter systems
- Mitsubishi Electric 230 V option
- Senville AURA 16.7k 230V
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- Cooper & Hunter Ceiling Cassette 16.8k 230V
- Guide library
- Mini split buying guide
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- Troubleshooting
- Do mini splits work in cold weather?
- Cooper & Hunter mini split review: is Cooper & Hunter any good?
- 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
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- What "DIY mini split" actually means
- How to install a mini split (DIY overview)
- R-32 vs R-454B: the mini split refrigerant change explained
- Mini split not heating
- Mini split indoor unit freezing up
- Mini split remote not working
- Mini split outdoor unit not running
- Mini split not cooling
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Cooper & Hunter One-Way Ceiling Cassette 17,000 BTU R-454B 208/230V (CH-RSH18MCT1W / CH-RHP18-230VO) myself, or do I need a pro?
- Cooper & Hunter One-Way Ceiling Cassette 17,000 BTU R-454B 208/230V (CH-RSH18MCT1W / CH-RHP18-230VO) 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 17,000 BTU R-454B 208/230V (CH-RSH18MCT1W / CH-RHP18-230VO) keep heating in a cold winter?
- The manufacturer publishes 17,500 BTU/h of heating output at 5F. Rated heating operation extends down to -22 F. Certified heating efficiency is 12.2 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 17,000 BTU R-454B 208/230V (CH-RSH18MCT1W / CH-RHP18-230VO) need?
- Published electrical requirements: 230 V voltage, 19 A 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 98.4 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 17,000 BTU R-454B 208/230V (CH-RSH18MCT1W / CH-RHP18-230VO) 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
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- Cooper & Hunter: Cooper & Hunter support-material submittal for CH-RHP18-230VO + CH-RSH18MCT1WSourced - manufacturer technical document
Covers Frequency, electrical_spec.guaranteed_voltage_range, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase and more
- 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
- 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