Ductless Systems
The flexible answer for zoned climate control
Ductless Systems
The flexible answer for zoned climate control
Single-zone and multi-zone ductless systems deliver warm or cool air right where you need it. Whether you want to improve temperature control in specific rooms or to replace inefficient window units and space heaters, a ductless system offers a solution that’s not only flexible—it’s quiet, efficient, economical, and easy to install.

23 SEER Single-Zone Ductless System Energy Star
- Available for installations in all regions (23 SEER)
- 9000, 12000, 18000, and 24000 BTUH models available
- Quiet operation (29-48 db)
- Handheld remote control included
- Heating capability down to -22°F (-30°C)
- Inverter driven (variable speed compressor)
- Includes base pan heaters
- Blue Fin Coastal coating
- Meets Energy Star® requirements
- AHRI Certified Systems
23 SEER Single-Zone Ductless System Energy Star
23 SEER HP Single Zone Ductless Systems
Outdoor | Indoor | SEER | HSPF | EER | Cooling Capacity (BTUH) | Heating Capacity (BTUH) | Voltage | Gas Line | Liquid Line | Max Overcurrent Protection | Low ambient heating capability |
M4THS2309A11NA | M4MHW2309A1N0A | 23 | 11 | 14.3 | 9100 | 11000 | 208‑230/60/1 | 3/8″ | 1/4″ | 15 | -22°-86° F (-30°-30° C) |
M4THS2312A11NA | M4MHW2312A1N0A | 23 | 11 | 13 | 12000 | 12000 | 208‑230/60/1 | 1/2″ | 1/4″ | 15 | -22°-86° F (-30°-30° C) |
M4THS2318A11NA | M4MHW2318A1N0A | 23 | 11 | 13 | 18200 | 18200 | 208‑230/60/1 | 5/8″ | 1/4″ | 20 | -22°-86° F (-30°-30° C) |
M4THS2324A11NA | M4MHW2324A1N0A | 23 | 11 | 13 | 22000 | 24000 | 208‑230/60/1 | 5/8″ | 1/4″ | 25 | -22°-86° F (-30°-30° C) |
SEER, or Seasonal Energy Efficiency Ratio, measures how efficiently a unit can cool your home in the summer. The higher the SEER number, the less energy you’ll use.
RunTru Limited Warranty:
5-year limited warranty for functional parts
10-year warranty for functional parts with registration
20-year warranty for heat exchanger
Find out more about the RunTru Limited Warranty here.
Energy and Owner Guides
Contractor Resources
Technical Documents

17 SEER Single-Zone Ductless System
- Available for installations in all regions (17 SEER)
- 9000, 12000, 18000, and 24000 BTUH models available
- Quiet operation (32-33 db)
- Handheld remote control included
- Inverter driven (variable speed compressor)
- Includes base pan heaters
- Blue Fin Coastal coating
- AHRI Certified Systems
17 SEER Single-Zone Ductless System
17 SEER HP Single Zone Ductless Systems
Outdoor | Indoor | SEER | HSPF | EER | Cooling Capacity (BTUH) | Heating Capacity (BTUH) | Voltage | Gas Line | Liquid Line | Max Overcurrent Protection |
M4THS1709A11NA | M4MHW1709A1N0A | 17 | 9 | 10.25 | 9100 | 9500 | 208‑230/60/1 | 3/8″ | 1/4″ | 15 |
M4THS1712A11NA | M4MHW1712A1N0A | 17 | 9 | 9.25 | 12000 | 13000 | 208‑230/60/1 | 3/8″ | 1/4″ | 15 |
M4THS1718A11NA | M4MHW1718A1N0A | 17 | 9 | 8.53 | 17400 | 18000 | 208‑230/60/1 | 1/2″ | 1/4″ | 20 |
M4THS1724A11NA | M4MHW1724A1N0A | 17 | 10 | 11.25 | 22000 | 24000 | 208‑230/60/1 | 5/8″ | 1/4″ | 30 |
17 SEER AC Single Zone Ductless Systems
Outdoor | Indoor | SEER | HSPF | EER | Cooling Capacity (BTUH) | Heating Capacity (BTUH) | Voltage | Gas Line | Liquid Line | Max Overcurrent Protection |
M4TCS1709A11NA | M4MCW1709A1N0A | 17 | – | 10.9 | 9100 | – | 208‑230/60/1 | 3/8″ | 1/4″ | 15 |
M4TCS1712A11NA | M4MCW1712A1N0A | 17 | – | 9.55 | 12000 | – | 208‑230/60/1 | 3/8″ | 1/4″ | 15 |
M4TCS1718A11NA | M4MCW1718A1N0A | 17 | – | 9.2 | 17400 | – | 208‑230/60/1 | 1/2″ | 1/4″ | 20 |
M4TCS1724A11NA | M4MCW1724A1N0A | 17 | – | 10.95 | 22000 | – | 208‑230/60/1 | 5/8″ | 1/4″ | 30 |
SEER, or Seasonal Energy Efficiency Ratio, measures how efficiently a unit can cool your home in the summer. The higher the SEER number, the less energy you’ll use.
RunTru Limited Warranty:
5-year limited warranty for functional parts
10-year warranty for functional parts with registration
20-year warranty for heat exchanger
Find out more about the RunTru Limited Warranty here.
Energy and Owner Guides
Contractor Resources
Technical Documents

15 SEER Multi-Zone Ductless System
- Available for installations in all regions (15 SEER)
- Connect up to five indoor units
- Outdoor sound range of 56-59 db
- Port adapters included
- 9000, 12000, 18000, and 24000 BTUH High Wall mounted indoor models available
- Handheld remote control included with each indoor unit
15 SEER Multi-Zone Ductless System
15 SEER Multi-Zone Outdoor Heat Pump
Outdoor | SEER | HSPF | EER | Cooling Capacity (BTUH) | Heating Capacity (BTUH) | Voltage | Number of Ports | Gas Line | Liquid Line | Max Overcurrent Protection |
M4THM1518A12N | 15 | 8.2 | 10.00 | 18000 | 19000 | 208‑230/60/1 | 2 | 3/8″ (2) | 1/4″ (2) | 20 |
M4THM1524A13N | 15 | 8.2 | 8.00 | 26000 | 29000 | 208‑230/60/1 | 3 | 3/8″ (3) | 1/4″ (3) | 30 |
M4THM1530A14N | 15 | 8.2 | 8.00 | 29000 | 30400 | 208‑230/60/1 | 4 | 3/8″ (4) | 1/4″ (4) | 45 |
M4THM1536A14N | 15 | 8.2 | 7.75 | 34000 | 35800 | 208‑230/60/1 | 4 | 3/8″ (2) 1/2″ (1) 5/8″ (1) |
1/4″ (3) 3/8″ (1) |
45 |
M4THM1542A15N | 15 | 8.2 | 9.1 | 40000 | 44500 | 208‑230/60/1 | 5 | 3/8″ (2) 1/2″ (2) 5/8″ (1) |
1/4″ (4) 3/8″ (1) |
50 |
15 SEER High Wall Mounted Indoor Unit
Indoor | Nominal Capacity (BTUH) | Voltage | Gas Line | Liquid Line |
M4MHW1509A1N0 | 9000 | 208‑230/60/1 | 3/8″ | 1/4″ |
M4MHW1512A1N0 | 12000 | 208‑230/60/1 | 3/8″ | 1/4″ |
M4MHW1518A1N0 | 18000 | 208‑230/60/1 | 1/2″ | 1/4″ |
M4MHW1524A1N0 | 24000 | 208‑230/60/1 | 5/8″ | 1/4″ |
SEER, or Seasonal Energy Efficiency Ratio, measures how efficiently a unit can cool your home in the summer. The higher the SEER number, the less energy you’ll use.
RunTru Limited Warranty:
5-year limited warranty for functional parts
10-year warranty for functional parts with registration
20-year warranty for heat exchanger
Find out more about the RunTru Limited Warranty here.
Energy and Owner Guides
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Contractor Resources
Technical Documents
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115 Volt Single-Zone Ductless System
- Available for installations in all regions (20-22 SEER)
- 9000 and 12000 BTUH models available
- Quiet operation (28-36 db)
- Handheld remote control included
- Inverter driven (variable speed compressor)
- Includes base pan heaters
- Blue Fin Coastal coating
- Meets Energy Star® requirements (9000 BTUH system only)
- AHRI Certified Systems
115 Volt Single-Zone Ductless System
115 Volt Single Zone Ductless Systems
Outdoor | Indoor | SEER | HSPF | EER | Cooling Capacity (BTUH) | Heating Capacity (BTUH) | Voltage | Gas Line | Liquid Line | Max Overcurrent Protection |
M4THS2209A91N* | M4MHW2209A9N0* | 22 | 9.8 | 13.2 | 9000 | 9500 | 115/60/1 | 3/8″ | 1/4″ | 30 |
M4THS2212A91N | M4MHW2212A9N0 | 20 | 9.6 | 12 | 12000 | 13000 | 115/60/1 | 3/8″ | 1/4″ | 30 |
Energy Star rated system*
SEER, or Seasonal Energy Efficiency Ratio, measures how efficiently a unit can cool your home in the summer. The higher the SEER number, the less energy you’ll use.
RunTru Limited Warranty:
5-year limited warranty for functional parts
10-year warranty for functional parts with registration
20-year warranty for heat exchanger
Find out more about the RunTru Limited Warranty here.