Cosmo / Cosmo Series
Cosmo 12k R-32 115V Mini-Split
The Cosmo 12k (115V) brings 1 ton to a household 115V circuit: SEER2 19, EER2 9.3, HSPF2 8.5 on R-32, with 12,000 BTU at 47F, 9,700 BTU at 17F and 8,500 BTU at 5F. It trades some efficiency for the convenience of plugging into a standard outlet, and it is ENERGY STAR certified.
Refrigerant generation
R-32 - current-generation refrigerant
Paid link
$810 / Fresh price - checked Jul 24, 2026
Need this installed?
Get installation quotes- Last sourced
- Aug 17, 2026
SplitAtlas score
7.7 / 10
(19.0 SEER2) among 12k systems
(8.5 HSPF2) among 12k systems
(70.8% heat retained at 5F; -13 F heating floor) among 12k systems
(5 yr parts / 5 yr compressor) across the catalogue
(6 verified features) across the catalogue
($810 median retail) among 12k systems
(5 manuals; spec sheet; 14 error-code rows) across the catalogue
Key ratings
Buyer review snapshot
Install difficulty
- Electrical: 115V; MCA 19 A; breaker/fuse 20 A.
- Line set: Flared line connections; included 16 ft; max 65 ft.
Alternatives
- Daikin ATMOSPHERA 12,000 BTU R-32 208/230V (FTXM12WVJU9 / RXM12WVJU9)
9.0 score / 12k / SEER2 25.2 / -13 F heating floor / 208/230V
Exact destination at HVACDirect: $2,848.00, checked Jul 23, 2026
- Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0)
8.9 score / 12k / SEER2 29.4 / -22 F heating floor / 230V
Exact destination at Alpine Home Air: $1,979.00, checked Jul 24, 2026
- Senville ELITE 12,000 BTU R-454B 208/230V (SENE-12EL-IHH / SENE-12EL-OH)
8.9 score / 12k / SEER2 29.4 / -22 F heating floor / 187-253V
Exact destination at Senville: $1,699.99, checked Jul 24, 2026
Availability and price context
- Verified current price: $809.99 at TOSOT Direct; availability in_stock; checked Jul 24, 2026.
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
Warranty: 5 years parts and compressor as standard.
Strengths
- 1 ton of capacity on a standard 115V circuit; ENERGY STAR certified.
- Holds 8,500 BTU of heat at 5F - respectable cold-weather retention.
- Current R-32 refrigerant; Gree-built at a value price.
Weaknesses
- EER2 9.3 - the lowest peak efficiency in the Cosmo line; 115V draw is higher for a 1-ton unit.
- Value-brand support network; professional install recommended.
Climate suitability
- Minimum heating ambient
- -13 F[1]
- Rated heating at 5F
- 8,500 BTU/h[4]
- Rated heating at 17F
- 9,700 BTU/h[4]
- Rated heating at 47F
- 12,000 BTU/h[4]
Specifications
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- Manufacturer
- Cosmo
- Brand
- Cosmo
- Product line
- Cosmo Series
- Model number
- GWH12AWCXB-A6DN*/I indoor / GWH12ATCXB-A6DNA1A/O outdoor
- Indoor unit model
- GWH12AWCXB-A6DN*/I
- Outdoor unit model
- GWH12ATCXB-A6DNA1A/O
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 12,000 BTU/h[4]
- Rated heating capacity
- 12,000 BTU/h[4]
- Voltage
- 115 V[1]
- MCA
- 19 A[1]
- Maximum fuse or breaker size
- 20 A[1]
- Breaker needed
- not published
- SEER2
- 19 SEER2[4]
- EER2
- 9.3 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
- 118 F[1]
- Indoor noise range
- 47/22 dB(A)[1]
- Outdoor noise rating
- not published
- Indoor weight
- 19.8 lb[1]
- Outdoor weight
- 58.4 lb[1]
- Refrigerant
- R-32[4]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 3/8 in suction
- Included line-set length
- 16 ft[2]
- Maximum line-set length
- 65 ft[1]
- Max line set per indoor
- not published
- Maximum elevation difference
- 40 ft[1]
- Max height between indoor units
- not published
- Wi-Fi support
- supported[2]
- Energy Star status
- ENERGY STAR certified[5]
- AHRI certification number
- 215685135[4]
- Warranty
- Standard: 5 yr parts / 5 yr compressor (published Cosmo warranty terms). 5-year TOSOT Direct Cosmo product-page warranty
- Install path
- Professional install / DIY-marketed
- Marketing install label
- DIY-marketed
- Retail price
- $809.99
- Available retailers
- TOSOT Direct
- Manual links
- Cosmo Single-Zone 9-24K User Manual, TOSOT Direct product documents page for Cosmo Series manuals, TOSOT Direct Cosmo Series product-document manual links plus TOSOT Direct mini-split error-code guide and FAQ, 12,000 BTU Mini-Split Heat Pump Air Conditioner-120V product-page specifications, TOSOT Cosmo Series brochure specifications for GWH12ATCXB-A6DNA1A
- Specification sheet
- 12,000 BTU Mini-Split Heat Pump Air Conditioner-120V 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
$810 / Fresh price - checked Jul 24, 2026
Installation considerations
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- Liquid line
- 1/4 in[1]
- Suction line
- 3/8 in[1]
- Line connection type
- Flared line connections[3]
- Precharged length
- not published
- Included line-set length
- 16 ft[2]
- Maximum line-set length
- 65 ft[1]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 32.9 in W x 10.8 in H x 7.9 in D[1]
- Outdoor dimensions
- 28.8 in W x 21.9 in H x 13 in D[1]
- Indoor weight
- 19.8 lb[1]
- Outdoor weight
- 58.4 lb[1]
- Drain size
- not published
Related systems and guides
- More Cosmo systems
- Cooper & Hunter comparison model
- Cosmo 12k model
- Cosmo sibling model
- Cooper & Hunter 230 V option
- Guide library
- Mini split buying guide
- Single-zone vs multi-zone mini splits
- Troubleshooting
- Do mini splits work in cold weather?
- The best 12,000 BTU mini splits of 2026
- 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
- Mini split not heating
- Mini split indoor unit freezing up
- Mini split remote not working
- Mini split Wi-Fi not connecting
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Cosmo Series 12,000 BTU R-32 115V (GWH12AWCXB-A6DN***/I / GWH12ATCXB-A6DNA1A/O) myself, or do I need a pro?
- Cosmo Series 12,000 BTU R-32 115V (GWH12AWCXB-A6DN***/I / GWH12ATCXB-A6DNA1A/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 12,000 BTU R-32 115V (GWH12AWCXB-A6DN***/I / GWH12ATCXB-A6DNA1A/O) keep heating in a cold winter?
- The manufacturer publishes 8,500 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 Cosmo Series 12,000 BTU R-32 115V (GWH12AWCXB-A6DN***/I / GWH12ATCXB-A6DNA1A/O) need?
- Published electrical requirements: 115 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 65 ft, and the included line set comes pre-charged for 16 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 Cosmo Series 12,000 BTU R-32 115V (GWH12AWCXB-A6DN***/I / GWH12ATCXB-A6DNA1A/O) carry?
- The manufacturer publishes these warranty tiers: Standard: 5 yr parts / 5 yr compressor (published Cosmo warranty terms). 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: 12,000 BTU Mini-Split Heat Pump Air Conditioner-120V official product pageSourced - manufacturer product page
Covers Included line-set length, Wi-Fi support, Retail price, Legacy compressor warranty value, Legacy warranty value, Standard compressor warranty and more
- TOSOT Direct / Cosmo: Cosmo Single-Zone 9-24K User ManualSourced - secondary source
Covers Line connection type
- AHRI certificate #215685135 - 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