SplitAtlas

Cooper & Hunter / Slim Duct

Cooper Hunter Slim Duct 24k Regular Concealed Ducted R-454B 208/230V Mini-Split

Certified capacity
24,000 BTU/h[2]
SEER2
19 SEER2[2]
Heating floor
-13 F[1]
Voltage
230 V[1]
Install path
Professional install

The standard-outdoor 24k slim-duct head matches the hyper version's 19 SEER2 exactly, with 24,000 BTU cooling and 25,000 heating at 11 HSPF2, rated to -13F.

Since the cooling efficiency is identical, the entire decision is about winter: the hyper version offers 0.7 more HSPF2, 1,000 BTU more heat, and nine more degrees of range. In a mild climate this one gives up nothing on cooling; in a cold one it gives up real capability.

1 zoneProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Cooper & Hunter 24000 BTU high-static slim duct indoor unit for an R-454B mini-split system.

Image: Cooper & Hunter official CH-RS24MDT-HS product page

Data completeness: 92%
Last sourced
Aug 2, 2026

SplitAtlas score

8.1 / 10

Methodology
Cooling efficiencyBottom quartile

(19.0 SEER2) among 24k systems

Heating efficiencyTop quartile

(11.0 HSPF2) among 24k systems

Cold-weather performanceBelow average

(5F certified capacity: 76% of the 47F rating; -13 F heating floor) among 24k 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.

    Get a quote

Key ratings

Rated cooling

24,000BTU/h[2]

Rated heating

25,000BTU/h[2]

Buyer review snapshot

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.

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 2, 2026
Page reviewed
Aug 2, 2026
Source-backed records
3
Newest source retrieved
Aug 2, 2026

Warranty tiers

Registered
5 yr parts / 7 yr compressor - licensed-technician installation and registration 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 and AHRI cold-climate designated. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -13 F.

Strengths

  • Matches the hyper version's cooling efficiency exactly.
  • 24,000 BTU cooling / 25,000 heating, fully concealed.

Weaknesses

  • -13F rating and 11 HSPF2, both behind the hyper version.
  • 19 SEER2 is modest, as ducting at this capacity always is.
  • Low-static head with little tolerance for long runs.

Climate suitability

Minimum heating ambient
-13 F[1]
Certified heating at 5F
19,000 BTU/h[2]
Rated heating at 17F
21,200 BTU/h[2]
Rated heating at 47F
25,000 BTU/h[2]

Specifications

Show
Manufacturer
Cooper & Hunter
Brand
Cooper & Hunter
Product line
Slim Duct
Model number
CH-RS24MDT-HS indoor / CH-RES24-230VO outdoor
Indoor unit model
CH-RS24MDT-HS
Outdoor unit model
CH-RES24-230VO
Number of zones
1
Max indoor units
not published
Rated cooling capacity
24,000 BTU/h[2]
Rated heating capacity
25,000 BTU/h[2]
Voltage
230 V[1]
MCA
24.9 A[1]
Maximum fuse or breaker size
25 A[1]
Breaker needed
not published
SEER2
19 SEER2[2]
EER2
12.5 EER2[2]
HSPF2 (Region 4)
11 HSPF2[2]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
2.3 COP[2]
Minimum outdoor heating temperature
-13 F[1]
Minimum outdoor cooling temperature
-13 F[1]
Maximum outdoor temperature
122 F[1]
Indoor noise range
not published
Outdoor noise rating
61.5 dBA[1]
Indoor weight
not published
Outdoor weight
130.29 lb[1]
Refrigerant
R-454B[2]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
3/8 in liquid / 5/8 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
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[2]
AHRI certification number
215864228[2]
Warranty
Registered: 5 yr parts / 7 yr compressor (licensed-technician installation and registration terms). Score uses Registered.. 7-year compressor and 5-year parts limited warranty with licensed-technician installation and registration terms.
Install path
Professional install
Retail price
Installed quote only
Available retailers
not published
Manual links
AHRI Active public directory row 215864228, Installation Manual - Medium/High Static Duct, Cooper & Hunter Multi R installation manual, Cooper & Hunter Slim Duct official product pages for CH-RS24MDT-HS, Owner's Manual - Medium/High Static Duct, Cooper & Hunter support-material submittal for CH-RES24-230VO + CH-RS24MDT-HS
Specification sheet
Cooper & Hunter support-material submittal for CH-RES24-230VO + CH-RS24MDT-HS
Last sourced date
Aug 2, 2026

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
Field wiring per C&H support-material submittal and local electrical code.[1]

Installation considerations

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

Related systems and guides

Frequently asked questions

Can I install the Cooper & Hunter Slim Duct 24,000 BTU R-454B 208/230V (CH-RS24MDT-HS / CH-RES24-230VO) myself, or do I need a pro?
Cooper & Hunter Slim Duct 24,000 BTU R-454B 208/230V (CH-RS24MDT-HS / 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 Slim Duct 24,000 BTU R-454B 208/230V (CH-RS24MDT-HS / CH-RES24-230VO) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 19,000 BTU/h of heating capacity at 5F. Rated heating operation extends down to -13 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 Slim Duct 24,000 BTU R-454B 208/230V (CH-RS24MDT-HS / 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 Slim Duct 24,000 BTU R-454B 208/230V (CH-RS24MDT-HS / CH-RES24-230VO) carry?
The manufacturer publishes these warranty tiers: Registered: 5 yr parts / 7 yr compressor (licensed-technician installation and registration 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 support-material submittal for CH-RES24-230VO + CH-RS24MDT-HSSourced - manufacturer technical document

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

  2. 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

  3. Cooper & Hunter: Cooper & Hunter Multi R installation manual limited warranty sectionSourced - manufacturer technical document

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

Last updated

Aug 2, 2026