SplitAtlas

Cooper & Hunter / Astoria Series

Cooper Hunter Astoria 18k Hyper R-454B 208/230V Mini-Split

Certified capacity
18,000 BTU/h[3]
SEER2
21.4 SEER2[3]
Heating floor
-22 F[1]
Voltage
230 V[1]
Install path
Professional install

The 18k Astoria Hyper is the full-size version of the same cold-climate platform, and it does exactly what a hyper unit should: it holds a flat 18,000 BTU of heat from 47F down to 5F, with no drop-off as the temperature falls. For a larger room where the heat pump is the primary source of warmth, that consistency is what matters.

Its cooling efficiency (21.4 SEER2) is mid-pack, and its 11 HSPF2 keeps heating-season running costs reasonable. Have it professionally installed - Cooper & Hunter's service network is thinner than the premium brands, and DIY refrigerant work can void the warranty.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

Need this installed?

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Error Codes
Cooper & Hunter Astoria 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / CH-RHP18-230VO) mini-split heat pump indoor wall unit

Image: Cooper & Hunter

Data completeness: 100%
Last sourced
Aug 29, 2026

SplitAtlas score

8.7 / 10

Methodology
Cooling efficiencyAbove average

(21.4 SEER2) among 18k systems

Heating efficiencyAbove average

(11.0 HSPF2) among 18k systems

Cold-weather performanceTop quartile

(5F certified capacity: 100% of the 47F rating; -22 F heating floor) among 18k systems

NoiseBelow average

(28 dBA indoor min / 57 dBA outdoor) among 18k 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

18,000BTU/h[3]

Rated heating

18,000BTU/h[3]

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

Availability and price context

This system needs a professional install, so its real price is an installed quote that depends on your home. We don't link to a listing for this exact model; get installation quotes to price it.

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

Registered
5 yr parts / 7 yr compressor - standard registration/installation terms

The score uses Registered. Additional published terms are shown for reference and not counted in the score.

Review methodology

Model context

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

Strengths

  • A flat 18,000 BTU of heat from 47F to 5F, with no taper in the cold.
  • An 11 HSPF2 signals efficient seasonal heating.

Weaknesses

  • Cooling efficiency (21.4 SEER2 / 12.5 EER2) is mid-pack.
  • A thinner service network than premium brands means a botched DIY charge can void coverage - use a pro.

Climate suitability

Minimum heating ambient
-22 F[1]
Certified heating at 5F
18,000 BTU/h[3]
Rated heating at 17F
18,000 BTU/h[3]
Rated heating at 47F
18,000 BTU/h[3]

Specifications

Show
Manufacturer
Cooper & Hunter
Brand
Cooper & Hunter
Product line
Astoria Series
Model number
CH-RH18MASTWM-230VI indoor / CH-RHP18-230VO outdoor
Indoor unit model
CH-RH18MASTWM-230VI
Outdoor unit model
CH-RHP18-230VO
Number of zones
1
Max indoor units
not published
Rated cooling capacity
18,000 BTU/h[3]
Rated heating capacity
18,000 BTU/h[3]
Voltage
230 V[1]
MCA
19 A[1]
Maximum fuse or breaker size
20 A[1]
Breaker needed
not published
SEER2
21.4 SEER2[3]
EER2
12.5 EER2[3]
HSPF2 (Region 4)
11 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
1.92 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
45/37/28 dB(A)[1]
Outdoor noise rating
57 dBA[1]
Indoor weight
30.42 lb[1]
Outdoor weight
99.87 lb[1]
Refrigerant
R-454B[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
1/4 in liquid / 1/2 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
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[4]
AHRI certification number
215864181[3]
Warranty
Registered: 5 yr parts / 7 yr compressor (standard registration/installation terms). Score uses Registered.. 5-year parts / 7-year compressor limited warranty with registration requirements.
Install path
Professional install
Retail price
Installed quote only
Available retailers
not published
Manual links
AHRI public directory record 215864181, ENERGY STAR exact check 215864181, Installation Manual R454B Outdoor units, Cooper&Hunter CH-RHP18-230VO official product page, Cooper&Hunter CH-RHP18-230VO + CH-RH18MASTWM-230VI support-material submittal/spec table
Specification sheet
Cooper&Hunter CH-RHP18-230VO + CH-RH18MASTWM-230VI support-material submittal/spec table
Last sourced date
Aug 29, 2026

Parts and filters

Fits Cooper & Hunter Astoria 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / CH-RHP18-230VO). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

filter-washable

Indoor washable air filter

Fits
Cooper & Hunter Astoria 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / CH-RHP18-230VO)
Filter care
Washable. Remove, clean, and reinstall. Cooper & Hunter does not publish a model-specific calendar cleaning interval for these filters. Cooper & Hunter does not publish a replacement interval or condition for this washable filter.
Fit note
Fits CH-RH18MASTWM-230VI / CH-RHP18-230VO. 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 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / CH-RHP18-230VO)
Fit note
Fits CH-RH18MASTWM-230VI / CH-RHP18-230VO. 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 1/2

Fits
Cooper & Hunter Astoria 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / CH-RHP18-230VO)
Fit note
Fits CH-RH18MASTWM-230VI / CH-RHP18-230VO by the 1/4 x 1/2 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 (18K Connecting pipe assembly Liquid Side Φ1/4in(Φ6.35) Gas Side Φ1/2in(Φ12.7))
Find this model's filterReplacement Parts & Filters

Electrical requirements

Show
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
not published

Installation considerations

Show
Liquid line
1/4 in[1]
Suction line
1/2 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
98.4 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
38.78 x 9.92 x 12.83 in[1]
Outdoor dimensions
35.04 x 13.46 x 26.50 in[1]
Indoor weight
30.42 lb[1]
Outdoor weight
99.87 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Cooper & Hunter Astoria 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / CH-RHP18-230VO) myself, or do I need a pro?
Cooper & Hunter Astoria 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / 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 Astoria 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / CH-RHP18-230VO) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 18,000 BTU/h of heating capacity at 5F. Rated heating operation extends down to -22 F. Certified heating efficiency is 11 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 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / 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. The outdoor unit's factory charge covers up to 25 ft of line; longer runs need added refrigerant. Measure the planned routing before ordering.
What warranty does the Cooper & Hunter Astoria 18,000 BTU R-454B 208/230V (CH-RH18MASTWM-230VI / CH-RHP18-230VO) carry?
The manufacturer publishes these warranty tiers: Registered: 5 yr parts / 7 yr compressor (standard registration/installation terms). Score uses Registered.. 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-RHP18-230VO + CH-RB18MOLVWM-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 #215864181 - 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, Registered compressor warranty, Registered warranty conditions, Registered parts warranty, Warranty notes

Last updated

Jul 24, 2026