SplitAtlas

Cooper & Hunter / Astoria Series

Cooper Hunter Astoria 12k Hyper R-454B 208/230V Mini-Split

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

Astoria is Cooper & Hunter's step-up line, and the Hyper is its cold-climate tune - built to keep heating hard when it is genuinely cold out. This 12k holds a flat 12,000 BTU of heat from a mild 47F all the way down to 17F, easing only slightly to 11,500 at 5F, so a well-sealed room stays warm on the nights a lesser heat pump would give up.

It is also efficient (25.4 SEER2), so it is not just winter muscle. The main caveat is Cooper & Hunter itself: its dealer and warranty network is thinner than Mitsubishi's or Daikin's, so this is a unit to have professionally installed - a botched DIY refrigerant charge can void the coverage that makes the value worthwhile.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Cooper & Hunter Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / CH-RHP12-230VO) mini-split heat pump indoor wall unit

Image: Cooper & Hunter

Data completeness: 100%
Last sourced
Aug 29, 2026

SplitAtlas score

8.9 / 10

Methodology
Cooling efficiencyTop quartile

(25.4 SEER2) among 12k systems

Heating efficiencyAbove average

(10.5 HSPF2) among 12k systems

Cold-weather performanceTop quartile

(95.8% heat retained at 5F; -22 F heating floor) among 12k systems

NoiseAbove average

(18 dBA indoor min / 52.5 dBA outdoor) among 12k systems

WarrantyBelow average

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

Feature setTop quartile

(6 verified features) across the catalogue

Documentation & partsTop quartile

(5 manuals; spec sheet; parts channel) 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

12,000BTU/h[3]

Buyer review snapshot

Best for / skip if

Best for

  • Top efficiency shortlists; SEER2 is 25.4.

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 could not find this exact model in stock at a retailer we work with when we last checked on 2026-08-29.

Source date

Model data sourced
Aug 29, 2026
Page reviewed
Jul 24, 2026
Source-backed records
6
Newest source retrieved
Aug 29, 2026

Warranty tiers

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

Review methodology

Strengths

  • Holds a flat 12,000 BTU of heat from 47F to 17F, still 11,500 at 5F - real cold-climate behavior.
  • Efficient for a 230V single-zone at 25.4 SEER2 / 13.4 EER2.
  • Current low-GWP R-454B refrigerant, ENERGY STAR certified.

Weaknesses

  • A 10.5 HSPF2 is solid but trails the strongest hyper units in the line.
  • Cooper & Hunter's dealer and warranty coverage is thinner than the premium brands, so professional install is the safe choice.

Climate suitability

Minimum heating ambient
-22 F[1]
Rated heating at 5F
11,500 BTU/h[3]
Rated heating at 17F
12,000 BTU/h[3]
Rated heating at 47F
12,000 BTU/h[3]

Specifications

Show
Manufacturer
Cooper & Hunter
Brand
Cooper & Hunter
Product line
Astoria Series
Model number
CH-RH12MASTWM-230VI indoor / CH-RHP12-230VO outdoor
Indoor unit model
CH-RH12MASTWM-230VI
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
12,000 BTU/h[3]
Voltage
230 V[1]
MCA
12 A[1]
Maximum fuse or breaker size
15 A[1]
Breaker needed
not published
SEER2
25.4 SEER2[3]
EER2
13.4 EER2[3]
HSPF2 (Region 4)
10.5 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
-22 F[1]
Minimum outdoor cooling temperature
-22 F[1]
Maximum outdoor temperature
122 F[1]
Indoor noise range
43/31/18 dB(A)[1]
Outdoor noise rating
52.5 dBA[1]
Indoor weight
23.37 lb[1]
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
Cooper&Hunter online kits can be sold with different line-set/accessory bundles; the AHRI-certified indoor/outdoor pair has no single included line-set length.
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[4]
AHRI certification number
215864180[3]
Warranty
Standard: 5 yr parts / 7 yr compressor (standard registration/installation terms). 5-year parts / 7-year compressor limited warranty with registration requirements.
Install path
Professional install
Retail price
We could not find this exact model in stock at a retailer we work with when we last checked on 2026-08-29.
Available retailers
not published
Manual links
AHRI public directory record 215864180, ENERGY STAR exact check 215864180, Installation Manual R454B Outdoor units, Cooper&Hunter CH-RHP12-230VO official product page, Cooper&Hunter CH-RHP12-230VO + CH-RH12MASTWM-230VI support-material submittal/spec table
Specification sheet
Cooper&Hunter CH-RHP12-230VO + CH-RH12MASTWM-230VI support-material submittal/spec table
Last sourced date
Aug 29, 2026

Parts and filters

Fits Cooper & Hunter Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / CH-RHP12-230VO). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

filter-washable

Indoor washable air filter

Fits
Cooper & Hunter Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / CH-RHP12-230VO)
Fit note
Fits CH-RH12MASTWM-230VI / CH-RHP12-230VO. Cooper & Hunter documents the indoor air-filter location but does not publish an orderable filter part number in the sourced manual; source by indoor model and serial through Cooper & Hunter or Heat & Cool parts support.
Source
Cooper & Hunter Multi R Installation Manual, Indoor unit overview, page p. 19 (Air purifying filter & Air filter(behind))

remote-control

Wireless remote control

Fits
Cooper & Hunter Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / CH-RHP12-230VO)
Fit note
Fits CH-RH12MASTWM-230VI / CH-RHP12-230VO. The sourced Cooper & Hunter manual documents wireless and wired remote-control types but does not publish an orderable remote part number for this indoor SKU; source by indoor model and serial through Cooper & Hunter or Heat & Cool parts support.
Source
Cooper & Hunter Multi R Installation Manual, Optional accessories, page p. 22 (There are two types of remote controls: wired and wireless.)

line-set-installation-kit

Connecting pipe assembly size - 1/4 x 3/8

Fits
Cooper & Hunter Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / CH-RHP12-230VO)
Fit note
Fits CH-RH12MASTWM-230VI / CH-RHP12-230VO by the 1/4 x 3/8 liquid/gas dimensions in the Cooper & Hunter accessory table. No offer is attached because the prior Cooper & Hunter retailer pass verified zero exact priced offers, and Heat & Cool monetization is still pending.
Source
Cooper & Hunter Multi R Installation Manual, Installation accessories, page p. 22 (6K/9K/12K Connecting pipe assembly Liquid Side Φ1/4in(Φ6.35) Gas Side Φ3/8in(Φ9.52))
Replacement Parts & Filters

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
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
Cooper&Hunter online kits can be sold with different line-set/accessory bundles; the AHRI-certified indoor/outdoor pair has no single included line-set length.
Maximum line-set length
82 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
33.74 x 9.09 x 11.81 in[1]
Outdoor dimensions
30.12 x 11.93 x 21.85 in[1]
Indoor weight
23.37 lb[1]
Outdoor weight
62.17 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Cooper & Hunter Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / CH-RHP12-230VO) myself, or do I need a pro?
Cooper & Hunter Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / 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 Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / CH-RHP12-230VO) keep heating in a cold winter?
The manufacturer publishes 11,500 BTU/h of heating output at 5F. Rated heating operation extends down to -22 F. Certified heating efficiency is 10.5 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 Cooper & Hunter Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / 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 Astoria 12,000 BTU R-454B 208/230V (CH-RH12MASTWM-230VI / CH-RHP12-230VO) carry?
The manufacturer publishes these warranty tiers: Standard: 5 yr parts / 7 yr compressor (standard registration/installation 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 CH-RHP12-230VO + CH-RB12MOLVWM-230VI official product page/support materialsSourced - manufacturer product page

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

  2. Cooper & Hunter: Flared refrigerant piping installation evidenceSourced - manufacturer technical document

    Covers Line connection type, Precharged length

  3. AHRI certificate #215864180 - 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

  5. Cooper & Hunter: Flared refrigerant piping installation evidenceSourced - manufacturer technical document

    Covers system.diy_status, system.installation_type, system.sales_intent

  6. Cooper & Hunter: Cooper&Hunter warranty and official support pagesSourced - manufacturer product page

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

Last updated

Jul 24, 2026