Cosmo / Cosmo Series
Cosmo 33.6k R-32 208/230V Mini-Split
The Cosmo 36k tops the line at 3 tons: SEER2 21, EER2 12, HSPF2 8.5 on R-32, with 34,000 BTU at 47F, 27,400 BTU at 17F and 24,600 BTU held at 5F - about 72% retention in deep cold. It delivers the most capacity Cosmo offers from a single head, with strong efficiency for the size and ENERGY STAR certification.
1 zoneProfessional install / DIY-marketedCurrent
Refrigerant generation
R-32 - current-generation refrigerant
Paid link
$2,499 / Checked Jul 24, 2026
Need this installed?
Get installation quotesData completeness: 98%
- Last sourced
- Aug 17, 2026
SplitAtlas score
8.1 / 10
Cooling efficiencyAbove average
(21.0 SEER2) among 36k systems
Heating efficiencyBottom quartile
(8.5 HSPF2) among 36k systems
Cold-weather performanceAbove average
(5F certified capacity: 72.4% of the 47F rating; -13 F heating floor) among 36k systems
WarrantyBottom quartile
(5 yr parts / 5 yr compressor) across the catalogue
Feature setTop quartile
(6 verified features) across the catalogue
Price-to-performanceAbove average
($2,499 median retail) across the catalogue
Documentation & partsTop quartile
(4 manuals; spec sheet; 14 error-code rows) across the catalogue
Key ratings
Buyer review snapshot
Install difficulty
Professional flared-line install
- Electrical: 230V; MCA 23 A; breaker/fuse 35 A.
- Line set: Flared line connections; included 16 ft; max 131.2 ft.
Availability and price context
- Last seen at TOSOT Direct on Jul 24, 2026: $2,499.00. Open the listing for today's price.
Source date
- Model data sourced
- Aug 17, 2026
- Page reviewed
- Jul 24, 2026
- Source-backed records
- 5
- Newest source retrieved
- Aug 17, 2026
Warranty tiers
- Base
- 5 yr parts / 5 yr compressor - published Cosmo warranty terms
The score uses Base. Additional published terms are shown for reference and not counted in the score.
Strengths
- EER2 12 / SEER2 21 - strong efficiency for a 3-ton single-zone.
- Holds 24,600 BTU of heat at 5F - heavy deep-cold output.
- ENERGY STAR with current R-32 refrigerant; Gree-built value price.
Weaknesses
- HSPF2 8.5 - seasonal heating efficiency trails premium units.
- At 3 tons, a zoned or ducted design often suits the load better; value-brand support network.
Climate suitability
- Minimum heating ambient
- -13 F[1]
- Certified heating at 5F
- 24,600 BTU/h[4]
- Rated heating at 17F
- 27,400 BTU/h[4]
- Rated heating at 47F
- 34,000 BTU/h[4]
Specifications
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- Manufacturer
- Cosmo
- Brand
- Cosmo
- Product line
- Cosmo Series
- Model number
- GWH36ATEXH-D6DN*/I indoor / GWH36ATEXH-D6DNA1G/O outdoor
- Indoor unit model
- GWH36ATEXH-D6DN*/I
- Outdoor unit model
- GWH36ATEXH-D6DNA1G/O
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 33,600 BTU/h[4]
- Rated heating capacity
- 34,000 BTU/h[4]
- Voltage
- 230 V[1]
- MCA
- 23 A[1]
- Maximum fuse or breaker size
- 35 A[1]
- Breaker needed
- not published
- SEER2
- 21 SEER2[4]
- EER2
- 12 EER2[4]
- HSPF2 (Region 4)
- 8.5 HSPF2[4]
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 1.8 COP[4]
- Minimum outdoor heating temperature
- -13 F[1]
- Minimum outdoor cooling temperature
- -13 F[1]
- Maximum outdoor temperature
- 122 F[1]
- Indoor noise range
- 52/36 dB(A)[1]
- Outdoor noise rating
- not published
- Indoor weight
- 34.2 lb[1]
- Outdoor weight
- 122.4 lb[1]
- Refrigerant
- R-32[4]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 5/8 in suction
- Included line-set length
- 16 ft[2]
- Maximum line-set length
- 131.2 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[2]
- Energy Star status
- ENERGY STAR certified[5]
- AHRI certification number
- 214568849[4]
- Warranty
- Base: 5 yr parts / 5 yr compressor (published Cosmo warranty terms). Score uses Base.. 5-year TOSOT Direct Cosmo product-page warranty
- Install path
- Professional install / DIY-marketed
- Marketing install label
- DIY-marketed
- Retail price
- $2,499.00
- Available retailers
- TOSOT Direct
- Manual links
- Cosmo 30/36K Outdoor Unit User Manual, TOSOT Direct product documents page for Cosmo Series manuals, 36,000 BTU Mini-Split Heat Pump Air Conditioner-230V product-page specifications, TOSOT Cosmo Series brochure specifications for GWH36ATEXH-D6DNA1G
- Specification sheet
- 36,000 BTU Mini-Split Heat Pump Air Conditioner-230V product-page specifications
- Last sourced date
- Aug 17, 2026
Retail purchase context
Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure
Paid link
$2,499 at TOSOT Direct
$2,499 / Checked Jul 24, 2026
Electrical requirements
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Installation considerations
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- Liquid line
- 1/4 in[1]
- Suction line
- 5/8 in[1]
- Line connection type
- Flared line connections[3]
- Precharged length
- not published
- Included line-set length
- 16 ft[2]
- Maximum line-set length
- 131.2 ft[1]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 42.4 in W x 13.1 in H x 9.7 in D[1]
- Outdoor dimensions
- 39.4 in W x 29.4 in H x 16.8 in D[1]
- Indoor weight
- 34.2 lb[1]
- Outdoor weight
- 122.4 lb[1]
- Drain size
- not published
Related systems and guides
- More Cosmo systems
- Mitsubishi M-Series GS 36k R-410A 208/230V Mini-Split
Previous generation
- GREE Livo GEN4 36k R-410A 208/230V Mini-Split
Previous generation
- Cosmo 30k R-32 208/230V Mini-Split
- Cosmo 36k R-32 208/230V 4-Zone Mini-Split
- Guide library
- Mini split buying guide
- Single-zone vs multi-zone mini splits
- Troubleshooting
- Do mini splits work in cold weather?
- The best cold-climate mini splits of 2026
- The best mini splits for heating of 2026
- Mini split heating capacity in the cold: what your unit actually delivers at 5F
- The mini split defrost cycle, explained
- The best DIY mini splits of 2026
- What "DIY mini split" actually means
- How to install a mini split (DIY overview)
- R-32 vs R-454B: the mini split refrigerant change explained
- What size mini split do I need for a garage?
- Mini split not heating
- Mini split indoor unit freezing up
- Mini split remote not working
- Mini split weak airflow
- Mini split outdoor unit not running
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Cosmo Series 33,600 BTU R-32 208/230V (GWH36ATEXH-D6DN***/I / GWH36ATEXH-D6DNA1G/O) myself, or do I need a pro?
- Cosmo Series 33,600 BTU R-32 208/230V (GWH36ATEXH-D6DN***/I / GWH36ATEXH-D6DNA1G/O) 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 Cosmo Series 33,600 BTU R-32 208/230V (GWH36ATEXH-D6DN***/I / GWH36ATEXH-D6DNA1G/O) keep heating in a cold winter?
- The AHRI/ENERGY STAR certification lists 24,600 BTU/h of heating capacity 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 Cosmo Series 33,600 BTU R-32 208/230V (GWH36ATEXH-D6DN***/I / GWH36ATEXH-D6DNA1G/O) need?
- Published electrical requirements: 230 V voltage, 23 A minimum circuit ampacity, and 35 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 131.2 ft. A 16 ft line set is included. Longer runs than the included set allows require a different line set, so measure the planned routing before ordering.
- What warranty does the Cosmo Series 33,600 BTU R-32 208/230V (GWH36ATEXH-D6DN***/I / GWH36ATEXH-D6DNA1G/O) carry?
- The manufacturer publishes these warranty tiers: Base: 5 yr parts / 5 yr compressor (published Cosmo warranty terms). Score uses Base.. Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.
Data sources
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- TOSOT Direct: TOSOT Residential and Light Commercial Split Systems brochure Cosmo table for GWH09ATCXB-D6DNA1CSourced - manufacturer technical document
Covers Frequency, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase, Manufacturer wire notes and more
- TOSOT Direct: 36,000 BTU Mini-Split Heat Pump Air Conditioner-230V official product pageSourced - manufacturer product page
Covers Included line-set length, Wi-Fi support, Retail price, Legacy compressor warranty value, Legacy warranty value, Base compressor warranty and more
- TOSOT Direct / Cosmo: Cosmo 30/36K Outdoor Unit User ManualSourced - secondary source
Covers Line connection type
- AHRI certificate #214568849 - 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
- ENERGY STAR: ENERGY STAR exact row check for AHRI 216997533Sourced - Energy Star listing
Covers Energy Star status
Last updated
Jul 24, 2026