SplitAtlas

Cooper & Hunter / Astoria Series

Cooper Hunter Astoria 24k Regular R-454B 208/230V Mini-Split

Certified capacity
24,000 BTU/h[3]
SEER2
23 SEER2[3]
Heating floor
-13 F[1]
Voltage
230 V[1]
Install path
Professional install

The standard Astoria 24k is a cooling-strong unit - its 14 EER2 is efficient right when the summer load peaks - sized for a large temperate-climate space that leans on air conditioning. It heats decently for a non-hyper 2-ton head (19,600 BTU even at 5F) but does taper as the cold deepens.

If cooling leads and winters are moderate, it is a well-priced, efficient fit. In a hard-freeze climate, reach for the Astoria Hyper 24k instead. Professional install recommended.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Cooper & Hunter Astoria 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO) 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

(23.0 SEER2) among 24k systems

Heating efficiencyTop 10%

(11.7 HSPF2) among 24k systems

Cold-weather performanceAbove average

(5F certified capacity: 78.4% of the 47F rating; -13 F heating floor) among 24k systems

NoiseAbove average

(27 dBA indoor min / 61.5 dBA outdoor) among 24k 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

24,000BTU/h[3]

Rated heating

25,000BTU/h[3]

Buyer review snapshot

Best for / skip if

Best for

  • High-efficiency shortlists; SEER2 is 23.

Install difficulty

Professional flared-line install
  • Electrical: 230V; MCA 24.9 A; breaker/fuse 25 A.
  • Line set: Flared line connections; precharged 25 ft; max 164 ft.

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: -13 F.

Strengths

  • A 14 EER2 - strong peak-cooling efficiency.
  • Holds 19,600 BTU of heat at 5F, good for a non-hyper 2-ton unit.

Weaknesses

  • Heating still tapers from its 25,000 BTU rating in the cold.
  • The Astoria Hyper 24k is the better option for hard-freeze climates.

Climate suitability

Minimum heating ambient
-13 F[1]
Certified heating at 5F
19,600 BTU/h[3]
Rated heating at 17F
22,400 BTU/h[3]
Rated heating at 47F
25,000 BTU/h[3]

Specifications

Show
Manufacturer
Cooper & Hunter
Brand
Cooper & Hunter
Product line
Astoria Series
Model number
CH-RH24MASTWM-230VI indoor / CH-RES24-230VO outdoor
Indoor unit model
CH-RH24MASTWM-230VI
Outdoor unit model
CH-RES24-230VO
Number of zones
1
Max indoor units
not published
Rated cooling capacity
24,000 BTU/h[3]
Rated heating capacity
25,000 BTU/h[3]
Voltage
230 V[1]
MCA
24.9 A[1]
Maximum fuse or breaker size
25 A[1]
Breaker needed
not published
SEER2
23 SEER2[3]
EER2
14 EER2[3]
HSPF2 (Region 4)
11.7 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
2.54 COP[3]
Minimum outdoor heating temperature
-13 F[1]
Minimum outdoor cooling temperature
-13 F[1]
Maximum outdoor temperature
122 F[1]
Indoor noise range
43.5/38.5/27 dB(A)[1]
Outdoor noise rating
61.5 dBA[1]
Indoor weight
43.65 lb[1]
Outdoor weight
130.29 lb[1]
Refrigerant
R-454B[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
3/8 in liquid / 5/8 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
164 ft[1]
Max line set per indoor
not published
Maximum elevation difference
82 ft[1]
Max height between indoor units
not published
Wi-Fi support
supported[1]
Energy Star status
ENERGY STAR certified[4]
AHRI certification number
215864187[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 215864187, ENERGY STAR exact check 215864187, Installation Manual R454B Outdoor units, Cooper&Hunter CH-RES24-230VO official product page, Cooper&Hunter CH-RES24-230VO + CH-RH24MASTWM-230VI support-material submittal/spec table
Specification sheet
Cooper&Hunter CH-RES24-230VO + CH-RH24MASTWM-230VI support-material submittal/spec table
Last sourced date
Aug 29, 2026

Parts and filters

Fits Cooper & Hunter Astoria 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

filter-washable

Indoor washable air filter

Fits
Cooper & Hunter Astoria 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO)
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-RH24MASTWM-230VI / CH-RES24-230VO. 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 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO)
Fit note
Fits CH-RH24MASTWM-230VI / CH-RES24-230VO. 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 - 3/8 x 5/8

Fits
Cooper & Hunter Astoria 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO)
Fit note
Fits CH-RH24MASTWM-230VI / CH-RES24-230VO by the 3/8 x 5/8 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 (24K/30K/33K/36K Connecting pipe assembly Liquid Side Φ3/8in(Φ9.52) Gas Side Φ5/8in(Φ16))
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
24.9 A[1]
Breaker needed
not published
Maximum breaker size
25 A[1]
Maximum fuse size
25 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
not published

Installation considerations

Show
Liquid line
3/8 in[1]
Suction line
5/8 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
164 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
47.13 x 11.02 x 14.61 in[1]
Outdoor dimensions
37.24 x 16.14 x 31.89 in[1]
Indoor weight
43.65 lb[1]
Outdoor weight
130.29 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Cooper & Hunter Astoria 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO) myself, or do I need a pro?
Cooper & Hunter Astoria 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO) 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 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 19,600 BTU/h of heating capacity at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 11.7 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 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO) need?
Published electrical requirements: 230 V voltage, 24.9 A minimum circuit ampacity, and 25 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 164 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 24,000 BTU R-454B 208/230V (CH-RH24MASTWM-230VI / CH-RES24-230VO) 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-RES24-230VO + CH-R24MOLVWM-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 #215864187 - 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