Description
The Cooper & Hunter Astoria Pro 12,000 BTU wall mounted system pairs the CH-RES12-230VO outdoor heat pump with the CH-PRO12MASTWM-230VI indoor unit as an AHRI-matched single-zone ductless mini split (AHRI #215864169). It is rated at 25.5 SEER2 on R-454B refrigerant and runs on 208/230V single-phase power, heating and cooling one room or zone without ductwork.
Astoria Pro is the professional version of the Astoria wall unit with a factory-installed refrigerant detection sensor (RDS) and a humidity sensor. It shares the Astoria serviceability: front-mounted electrical box with kickstand cover, removable blower wheel and a magnetic top filter. Wireless remote and Smart Kit included.
What's Included
- 1 × CH-RES12-230VO Cooper & Hunter outdoor heat pump condenser
- 1 × CH-PRO12MASTWM-230VI Astoria Pro wall mounted indoor unit
- 1 × wireless remote control
- Smart Kit (Wi-Fi, Cooper & Hunter app)
System Performance
- AHRI Reference Number: 215864169
- Nominal Capacity: 12,000 BTU/h (1 ton)
- SEER2: 25.5
- HSPF2 (Region IV): 10.2
- Heating Capacity @ 47°F: 12,000 (3,700~15,600)
- Refrigerant: R-454B
- Power Supply: 208/230V 1-Phase 60 Hz
- Outdoor Unit Type: Regular (heats down to -13°F)
Component Specifications
Outdoor Unit — CH-RES12-230VO
- Model: CH-RES12-230VO
- Cooling Capacity, rated (min~max) BTU/h: 11,500 (3,100~13,000)
- Heating Capacity, rated (min~max) BTU/h: 12,000 (3,700~15,600)
- COP @ 47°F: 3.42
- HSPF2 (Region IV / V): 10.2 / 8
- Refrigerant Piping (Liquid/Gas): 1/4"/3/8"
- Max Line Length (ft): 82
- Max Height Difference (ft): 49.2
- Minimum Circuit Ampacity (A): 12
- Max Fuse / Breaker (A): 15
- Outdoor Sound Level (dB(A)): 55.5
- Cooling Operating Range (°F outdoor): -13~122
- Heating Operating Range (°F outdoor): -13~75
- Unit Dimensions (W x D x H): 30.12 in x 11.93 in x 21.85 in
- Net / Shipping Weight: 62.17 lb / 67.68 lb
Indoor Unit — CH-PRO12MASTWM-230VI
- Model: CH-PRO12MASTWM-230VI
- Cooling Capacity (BTU/h): 12,000
- Refrigerant Piping (Liquid/Gas): 1/4"/3/8"
- Airflow (CFM, high to low): 441.4 / 323.7 / 229.6 / 176.6
- Sound Level (dB(A), high/med/low): 38/33/18
- Condensate Drain: 5/8"
- Unit Dimensions (W x D x H): 33.74 in x 9.09 in x 11.81 in
- Net / Shipping Weight: 22.93 lb / 29.32 lb
Installation Notes
Mini split heat pumps must be installed by a licensed HVAC technician: the line set is flared, pressure tested, evacuated and charge-adjusted on site. R-454B is a mildly flammable (A2L) refrigerant, so A2L-rated tools and the manufacturer's procedures are required. Size the unit from a room load calculation rather than square footage alone. Each outdoor unit needs its own dedicated circuit sized to the rating plate (12 A MCA, 15 A max fuse).
White Paper
- Cooper & Hunter CH-RES12-230VO + CH-PRO12MASTWM-230VI Submittal (PDF)
- Cooper & Hunter CH-PRO12MASTWM-230VI Spec Sheet (PDF)
- Cooper & Hunter Installation Manual – R-454B Outdoor Units (PDF)
- Cooper & Hunter New Smart Kit Manual 2025 (PDF)
- Cooper & Hunter Owner's Manual R-454B Astoria (PDF)
- Cooper & Hunter Remote Controller Manual Astoria (PDF)
- Cooper & Hunter Accessories Leaflet 2024 (PDF)
- Cooper & Hunter Astoria Pro Leaflet 2026 (PDF)
Common Questions
Does this system come with a line set?
No. The line set, communication wire, wall sleeve, condensate line and mounting hardware are sold separately.
Can this outdoor unit run more than one indoor unit?
No. This is a single-zone (one outdoor to one indoor) system. Cooper & Hunter multi-zone condensers are listed separately.
