Goodman / Goodman 20 Series
Goodman 20 18k R-32 208/230V Mini-Split
The 20 Series 18k is Goodman's 1.5-ton single-zone cold-climate head, on 230V and low-GWP R-32. It leads its smaller sibling on peak efficiency at 20 SEER2 and a full 12 EER2, with a 9.3 HSPF2, and it is AHRI cold-climate designated with outstanding low-temperature output: 21,600 BTU at 47F and a near-flat 21,000 BTU at 5F. Like the 12k, it is not currently ENERGY STAR certified.
Refrigerant generation
R-32 - current-generation refrigerant
Need this installed?
Get installation quotes- Last sourced
- Jul 27, 2026
SplitAtlas score
7.8 / 10
(20.0 SEER2) among 18k systems
(9.3 HSPF2) among 18k systems
(97.2% heat retained at 5F; -13 F heating floor) among 18k systems
(33 dBA indoor min / 55 dBA outdoor) among 18k systems
(10 yr parts / 10 yr compressor) across the catalogue
(4 verified features) across the catalogue
(4 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.
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Key ratings
Best-fit use cases
Well suited to a large bedroom, living room, or open area in a cold climate where you want heavy, steady deep-cold heating and strong peak efficiency from a value brand on a 230V circuit.
Buyer review snapshot
Install difficulty
- Electrical: 230V; breaker/fuse 25 A.
- Line set: connection type not sourced; precharged 49 ft; max 66 ft.
Alternatives
- Blueridge XS6 Max Efficiency 18,000 BTU R-454B 208/230V (BXS6A18WM0 / BXS6A18UC0)
9.0 score / 18k / SEER2 25.6 / -22 F heating floor / 230V
Exact destination at Alpine Home Air: $2,359.00, checked Jul 24, 2026
- Senville ELITE 18,000 BTU R-454B 208/230V (SENE-18EL-IHH / SENE-18EL-OH)
8.9 score / 18k / SEER2 25.6 / -22 F heating floor / 187-253V
Exact destination at Senville: $1,899.99, checked Jul 24, 2026
- ACiQ Standard 18,000 BTU R-454B 208/230V (ACIQ-18WS-HP230C / ACIQ-18ZS-HP230C)
8.8 score / 18k / SEER2 24 / -13 F heating floor / 230V
Exact destination at HVACDirect: $1,299.99, checked Jul 26, 2026
Availability and price context
We could not verify a current retail price for this model. We could not find a published consumer price for this model when we last checked on 2026-07-27.
Source date
- Model data sourced
- Jul 27, 2026
- Page reviewed
- Jul 27, 2026
- Source-backed records
- 3
- Newest source retrieved
- Jul 27, 2026
Warranty tiers
Warranty: 10 years parts and no separate compressor term published if registration; complete Goodman warranty terms apply.
Model context
- Structured ratings
- Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: current low-GWP R-32. Minimum heating ambient: -13 F.
Strengths
- Nearly flat heating curve, 21,000 BTU at 5F from a 21,600 BTU rating at 47F
- Higher peak efficiency than the 12k, at 20 SEER2 and a full 12 EER2
- Cold-climate designated on current low-GWP R-32
Weaknesses
- 9.3 HSPF2 trails the 12k's 10.0, so seasonal heating efficiency is a touch lower
- Not currently ENERGY STAR certified; Goodman's ductless support network is thinner than premium ductless brands
Climate suitability
- Minimum heating ambient
- -13 F[1]
- Rated heating at 5F
- 21,000 BTU/h[2]
- Rated heating at 17F
- 20,800 BTU/h[2]
- Rated heating at 47F
- 21,600 BTU/h[2]
Specifications
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- Manufacturer
- Goodman
- Brand
- Goodman
- Product line
- Goodman 20 Series
- Model number
- GTXV18BVJN indoor / GRXTH18BVJN outdoor
- Indoor unit model
- GTXV18BVJN
- Outdoor unit model
- GRXTH18BVJN
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 18,000 BTU/h[2]
- Rated heating capacity
- 21,600 BTU/h[2]
- Voltage
- 230 V[1]
- MCA
- not published - manufacturer specifies 25 A breaker
- Maximum fuse or breaker size
- 25 A[1]
- Breaker needed
- 25 A[1]
- SEER2
- 20 SEER2[2]
- EER2
- 12 EER2[2]
- HSPF2 (Region 4)
- 9.3 HSPF2[2]
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 1.8 COP[2]
- Minimum outdoor heating temperature
- -13 F[1]
- Minimum outdoor cooling temperature
- not published
- Maximum outdoor temperature
- not published
- Indoor noise range
- 48/43/38/33 dB(A)[1]
- Outdoor noise rating
- 55 dBA[1]
- Indoor weight
- 27 lb[1]
- Outdoor weight
- 131 lb[1]
- Refrigerant
- R-32[2]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- not published
- Included line-set length
- not published
- Maximum line-set length
- 66 ft[1]
- Max line set per indoor
- not published
- Maximum elevation difference
- 49 ft[1]
- Max height between indoor units
- not published
- Wi-Fi support
- supported[1]
- Energy Star status
- Not ENERGY STAR certified[3]
- AHRI certification number
- 218672387[2]
- Warranty
- Best case: 10 yr parts / no separate compressor term (registration; complete Goodman warranty terms apply). 10-year parts limited warranty with registration; complete Goodman warranty terms apply.
- Install path
- Professional install
- Retail price
- We could not find a published consumer price for this model when we last checked on 2026-07-27.
- Available retailers
- not published
- Manual links
- AHRI public directory record 218672387, ENERGY STAR exact check 218672387, Retail exact search GRXTH18BVJN / GTXV18BVJN, Goodman 20 Series Line Up ductless brochure CB-GDMN-DUCTLESS_06-26
- Specification sheet
- Goodman 20 Series Line Up ductless brochure CB-GDMN-DUCTLESS_06-26
- Last sourced date
- Jul 27, 2026
Electrical requirements
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Installation considerations
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- Liquid line
- not published
- Suction line
- not published
- Line connection type
- not published
- Precharged length
- 49 ft[1]
- Included line-set length
- not published
- Maximum line-set length
- 66 ft[1]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 39 x 10 3/8 x 11 5/8 in[1]
- Outdoor dimensions
- 34 1/4 x 12 5/8 x 29 1/2 in[1]
- Indoor weight
- 27 lb[1]
- Outdoor weight
- 131 lb[1]
- Drain size
- not published
Related systems and guides
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- Guide library
- Mini split buying guide
- Single-zone vs multi-zone mini splits
- Troubleshooting
- Do mini splits work in cold weather?
- The best 18,000 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 making loud noise
- Mini split Wi-Fi not connecting
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Goodman 20 Series 18,000 BTU R-32 208/230V (GTXV18BVJN / GRXTH18BVJN) myself, or do I need a pro?
- Goodman 20 Series 18,000 BTU R-32 208/230V (GTXV18BVJN / GRXTH18BVJN) 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 Goodman 20 Series 18,000 BTU R-32 208/230V (GTXV18BVJN / GRXTH18BVJN) keep heating in a cold winter?
- The manufacturer publishes 21,000 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 9.3 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 Goodman 20 Series 18,000 BTU R-32 208/230V (GTXV18BVJN / GRXTH18BVJN) need?
- Published electrical requirements: 230 V voltage, not published - manufacturer specifies 25 A breaker 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 66 ft, and the included line set comes pre-charged for 49 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 Goodman 20 Series 18,000 BTU R-32 208/230V (GTXV18BVJN / GRXTH18BVJN) carry?
- The manufacturer publishes these warranty tiers: Best case: 10 yr parts / no separate compressor term (registration; complete Goodman warranty terms apply). Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.
Data sources
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- Daikin Comfort Technologies North America, Inc.: Goodman 20 Series Line Up brochure GRXT18BVJN / GTXV18BVJNSourced - manufacturer technical document
Covers Breaker needed, Frequency, Maximum breaker size, Maximum fuse size, Phase, Voltage and more
- Air-Conditioning, Heating, and Refrigeration Institute: AHRI Appendix M1 public detail for GRXTH18BVJN / GTXV18BVJNSourced - AHRI directory
Covers AHRI certification number, performance_spec.cold_climate_designation, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity and more
- U.S. Environmental Protection Agency ENERGY STAR: ENERGY STAR exact AHRI-reference check for 218672387Sourced - Energy Star listing
Covers Energy Star status
Last updated
Jul 27, 2026