Pioneer / Quantum Ultra
Pioneer Quantum Ultra 12k One-Way Cassette R-454B 208/230V Mini-Split
The Pioneer Quantum Ultra 12k one-way cassette gives the same 22.1 SEER2 headline as the 9k, a 22 dB mute rating, and 8,600 BTU at both 17F and 5F, but HSPF2 is a modest 10.0.
1 zoneProfessional installCurrent
Refrigerant generation
R-454B - current-generation refrigerant
Paid link
$2,408 / Fresh price - checked Aug 2, 2026
Need this installed?
Get installation quotesData completeness: 100%
- Last sourced
- Aug 2, 2026
SplitAtlas score
8.0 / 10
Cooling efficiencyAbove average
(22.1 SEER2) among 12k systems
Heating efficiencyBelow average
(10.0 HSPF2) among 12k systems
Cold-weather performanceBelow average
(71.7% heat retained at 5F; -13 F heating floor) among 12k systems
NoiseBelow average
(22 dBA indoor min / 54 dBA outdoor) among 12k systems
Feature setAbove average
(6 verified features) across the catalogue
Price-to-performanceBottom quartile
($2,408 median retail) among 12k systems
Documentation & partsBelow average
(4 manuals; spec sheet) across the catalogue
Not evaluated
- Installation accessibility — not applicable (professional install)N/A
professional install - DIY-accessibility not applicable
Key ratings
Buyer review snapshot
Best for / skip if
Best for
- High-efficiency shortlists; SEER2 is 22.1.
Install difficulty
Professional install
- Electrical: 230V; MCA 15 A; breaker/fuse 15 A.
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: $2,408.00 at Pioneer; availability in_stock; checked Aug 2, 2026.
Source date
- Model data sourced
- Aug 2, 2026
- Page reviewed
- Aug 12, 2026
- Source-backed records
- 3
- Newest source retrieved
- Aug 2, 2026
Warranty tiers
Warranty: up to 10-year Quantum Ultra warranty coverage
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
- Quiet one-way recessed head with complete Pioneer specs.
- ENERGY STAR certified.
- 15A breaker and 3/8 gas, 1/4 liquid line sizes match the small-capacity installation class.
- Good choice when the 9k one-way is undersized but the 18k is too much.
Weaknesses
- 5F output is only about 72 percent of the 12,000 BTU 47F heating rating.
- Direct price is close to larger Senville options.
- HSPF2 trails the Pioneer 18k one-way and Senville 9k one-way entries.
Climate suitability
- Minimum heating ambient
- -13 F[1]
- Rated heating at 5F
- 8,600 BTU/h[2]
- Rated heating at 17F
- 8,600 BTU/h[2]
- Rated heating at 47F
- 12,000 BTU/h[2]
Specifications
ShowHide
- Manufacturer
- Pioneer
- Brand
- Pioneer
- Product line
- Quantum Ultra
- Model number
- CK012GMSILDFHG indoor / YN012GMSI24RPG outdoor
- Indoor unit model
- CK012GMSILDFHG
- Outdoor unit model
- YN012GMSI24RPG
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 12,000 BTU/h[2]
- Rated heating capacity
- 12,000 BTU/h[2]
- Voltage
- 230 V[1]
- MCA
- 15 A[1]
- Maximum fuse or breaker size
- 15 A[1]
- Breaker needed
- 15 A[1]
- SEER2
- 22.1 SEER2[2]
- EER2
- 12.3 EER2[2]
- HSPF2 (Region 4)
- 10 HSPF2[2]
- HSPF2 (Region 5)
- 7.8 HSPF2[1]
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 2.48 COP[2]
- Minimum outdoor heating temperature
- -13 F[1]
- Minimum outdoor cooling temperature
- 5 F[1]
- Maximum outdoor temperature
- 131 F[1]
- Indoor noise range
- ( Turbo/Hi/Med/Lo/Mute): 47 / 43 / 38 / 26 / 22 dB(A)[1]
- Outdoor noise rating
- 54 dBA[1]
- Indoor weight
- 45 lb[1]
- Outdoor weight
- 62.1 lb[1]
- Refrigerant
- R-454B[2]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 3/8 in suction
- Included line-set length
- Pioneer full-set product page offers multiple no-kit and line-set variants; no single included line-set length applies to the certified system pair.
- Maximum line-set length
- Pioneer product pages in the cached collection did not publish a single maximum line-set length for these full-set variants.
- Max line set per indoor
- not published
- Maximum elevation difference
- Pioneer product pages in the cached collection did not publish a single maximum elevation for these full-set variants.
- Max height between indoor units
- not published
- Wi-Fi support
- supported[1]
- Energy Star status
- ENERGY STAR certified[3]
- AHRI certification number
- 218010987[2]
- Warranty
- up to 10-year Quantum Ultra warranty coverage
- Install path
- Professional install
- Retail price
- $2,408.00
- Available retailers
- Pioneer
- Manual links
- AHRI Active row 218010987, One-Way Ceiling Cassette installation requirements from Pioneer product technical table, Pioneer® Quantum Ultra™ 12,000 BTU 22 SEER2 230V Single-Way Ceiling Recessed Cassette Ductless Mini-Split Air Conditioner Inverter Heat Pump Full Set official product page, Pioneer® Quantum Ultra™ 12,000 BTU 22 SEER2 230V Single-Way Ceiling Recessed Cassette Ductless Mini-Split Air Conditioner Inverter Heat Pump Full Set official product-page technical table
- Specification sheet
- Pioneer® Quantum Ultra™ 12,000 BTU 22 SEER2 230V Single-Way Ceiling Recessed Cassette Ductless Mini-Split Air Conditioner Inverter Heat Pump Full Set official product-page technical table
- Last sourced date
- Aug 2, 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
Check price at Pioneer
$2,408 / Fresh price - checked Aug 2, 2026
Installation considerations
ShowHide
- Liquid line
- 1/4 in[1]
- Suction line
- 3/8 in[1]
- Line connection type
- not published
- Precharged length
- not published
- Included line-set length
- Pioneer full-set product page offers multiple no-kit and line-set variants; no single included line-set length applies to the certified system pair.
- Maximum line-set length
- Pioneer product pages in the cached collection did not publish a single maximum line-set length for these full-set variants.
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 50"-3/8 x 13"-1/4 x 10" Inches[1]
- Outdoor dimensions
- 30"-1/8 x 12" x 21"-7/8 Inches[1]
- Indoor weight
- 45 lb[1]
- Outdoor weight
- 62.1 lb[1]
- Drain size
- not published
Related systems and guides
- More Pioneer systems
- Pioneer 230 V option
- Samsung WindFree IAQ 12k 230V
- Pioneer Quantum Ultra 16k 230V
- Pioneer 12k model
- Guide library
- Mini split buying guide
- Single-zone vs multi-zone mini splits
- Troubleshooting
- Do mini splits work in cold weather?
- Pioneer mini split review: is Pioneer any good?
- 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)
- Pioneer mini split not cooling
- Mini split not heating
- Mini split indoor unit freezing up
- Mini split making loud noise
- Mini split smells bad
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Pioneer Quantum Ultra One-Way Ceiling Cassette 12,000 BTU R-454B 208/230V (CK012GMSILDFHG / YN012GMSI24RPG) myself, or do I need a pro?
- Pioneer Quantum Ultra One-Way Ceiling Cassette 12,000 BTU R-454B 208/230V (CK012GMSILDFHG / YN012GMSI24RPG) 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 Pioneer Quantum Ultra One-Way Ceiling Cassette 12,000 BTU R-454B 208/230V (CK012GMSILDFHG / YN012GMSI24RPG) keep heating in a cold winter?
- The manufacturer publishes 8,600 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 10 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 Pioneer Quantum Ultra One-Way Ceiling Cassette 12,000 BTU R-454B 208/230V (CK012GMSILDFHG / YN012GMSI24RPG) need?
- Published electrical requirements: 230 V voltage, 15 A minimum circuit ampacity, and 15 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 Pioneer product pages in the cached collection did not publish a single maximum line-set length for these full-set variants.. Longer runs than the included set allows typically mean added refrigerant and a pro visit, so measure the planned routing before ordering.
Data sources
ShowHide
- Pioneer / Parker Davis HVAC International, Inc.: Pioneer® Quantum Ultra™ 48,000 BTU 17 SEER2 230V Slim-Duct Ceiling Concealed Mini-Split Air Conditioner Inverter Heat Pump Full SetSourced - manufacturer product page
Covers Breaker needed, Frequency, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase and more
- Air-Conditioning, Heating, and Refrigeration Institute: AHRI Active form-factor row 218010987Sourced - AHRI directory
Covers AHRI certification number, performance_spec.cold_climate_designation, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity and more
- ENERGY STAR: ENERGY STAR exact row check for AHRI 218010994Sourced - Energy Star listing
Covers Energy Star status
Last updated
Aug 12, 2026