SplitAtlas

Cooper & Hunter / Astoria Series

Cooper Hunter Astoria 36k Regular R-454B 208/230V Mini-Split

Certified capacity
36,000 BTU/h[3]
SEER2
19 SEER2[3]
Heating floor
-13 F[1]
Voltage
230 V[1]
Install path
Professional install

The 36k standard Astoria is the biggest single-zone head in the line - three tons - and, like its Pro counterpart, it is a capacity choice rather than an efficient one. It puts out 36,000 BTU and holds 22,000 of heat at 5F, but its efficiency (a low 8.6 EER2, 8.5 HSPF2) is the weakest in the range and it is not ENERGY STAR certified.

For most large spaces a multi-zone system is the smarter design - more even comfort, lower bills. This makes sense only when a single big head is the hard requirement and upfront capacity trumps running cost. Professional install recommended.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Cooper & Hunter Astoria 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO) mini-split heat pump indoor wall unit

Image: Cooper & Hunter

Data completeness: 100%
Last sourced
Aug 29, 2026

SplitAtlas score

7.3 / 10

Methodology
Cooling efficiencyBottom quartile

(19.0 SEER2) among 36k systems

Heating efficiencyBottom quartile

(8.5 HSPF2) among 36k systems

Cold-weather performanceBottom quartile

(61.1% heat retained at 5F; -13 F heating floor) among 36k systems

NoiseBottom quartile

(43 dBA indoor min / 62 dBA outdoor) among 36k systems

WarrantyBelow average

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

Feature setBelow average

(4 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

36,000BTU/h[3]

Rated heating

36,000BTU/h[3]

Buyer review snapshot

Install difficulty

Professional flared-line install
  • Electrical: 230V; MCA 35 A; breaker/fuse 40 A.
  • Line set: Flared line connections; precharged 25 ft; max 164 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

  • 36,000 BTU from one head covers large spaces.
  • Still delivers 22,000 BTU of heat at 5F for a non-hyper unit.
  • R-454B low-GWP refrigerant.

Weaknesses

  • A low 8.6 EER2 and 8.5 HSPF2 are the lowest efficiency marks in the range, and it lacks ENERGY STAR certification.
  • At 36,000 BTU, a multi-zone system is usually the smarter design.

Climate suitability

Minimum heating ambient
-13 F[1]
Rated heating at 5F
22,000 BTU/h[3]
Rated heating at 17F
24,200 BTU/h[3]
Rated heating at 47F
36,000 BTU/h[3]

Specifications

Show
Manufacturer
Cooper & Hunter
Brand
Cooper & Hunter
Product line
Astoria Series
Model number
CH-RH36MASTWM-230VI indoor / CH-REL36-230VO outdoor
Indoor unit model
CH-RH36MASTWM-230VI
Outdoor unit model
CH-REL36-230VO
Number of zones
1
Max indoor units
not published
Rated cooling capacity
36,000 BTU/h[3]
Rated heating capacity
36,000 BTU/h[3]
Voltage
230 V[1]
MCA
35 A[1]
Maximum fuse or breaker size
40 A[1]
Breaker needed
not published
SEER2
19 SEER2[3]
EER2
8.6 EER2[3]
HSPF2 (Region 4)
8.5 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
1.9 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
52/47/43 dB(A)[1]
Outdoor noise rating
62 dBA[1]
Indoor weight
42.77 lb[1]
Outdoor weight
154 lb[1]
Refrigerant
R-454B[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
3/8 in liquid / 3/4 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
Not ENERGY STAR certified[4]
AHRI certification number
217477697[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 217477697, ENERGY STAR exact check 217477697, Installation Manual R454B Outdoor units, Cooper&Hunter CH-REL36-230VO official product page, Cooper&Hunter CH-REL36-230VO + CH-RH36MASTWM-230VI support-material submittal/spec table
Specification sheet
Cooper&Hunter CH-REL36-230VO + CH-RH36MASTWM-230VI support-material submittal/spec table
Last sourced date
Aug 29, 2026

Parts and filters

Fits Cooper & Hunter Astoria 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

filter-washable

Indoor washable air filter

Fits
Cooper & Hunter Astoria 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO)
Fit note
Fits CH-RH36MASTWM-230VI / CH-REL36-230VO. 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 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO)
Fit note
Fits CH-RH36MASTWM-230VI / CH-REL36-230VO. 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 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO)
Fit note
Fits CH-RH36MASTWM-230VI / CH-REL36-230VO 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))
Replacement Parts & Filters

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
35 A[1]
Breaker needed
not published
Maximum breaker size
40 A[1]
Maximum fuse size
40 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
3/4 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
53.15 x 12.83 x 10.00 in[1]
Outdoor dimensions
37.24 x 16.14 x 31.89 in[1]
Indoor weight
42.77 lb[1]
Outdoor weight
154 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Cooper & Hunter Astoria 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO) myself, or do I need a pro?
Cooper & Hunter Astoria 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO) 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 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO) keep heating in a cold winter?
The manufacturer publishes 22,000 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 8.5 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 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO) need?
Published electrical requirements: 230 V voltage, 35 A minimum circuit ampacity, and 40 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, 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 36,000 BTU R-454B 208/230V (CH-RH36MASTWM-230VI / CH-REL36-230VO) 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-REL36-230VO + CH-R36MELVWM-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 #217477697 - 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