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By COSTWAY
COSTWAY 12000BTU Mini Split Air Conditioner& Heater
4.1 ★ (1,632 reviews)
🏆 #5 in Split-System Air Conditioners
Price shown at time of last analysis. Verify current price on Amazon.
Positive — 8/10 ⓘ
AgreGtr Analysis
The Costway mini split AC/heat pump receives overwhelmingly positive feedback across a wide range of installations including garages, workshops, cabins, and living spaces. Most buyers praise its quiet operation, strong cooling and heating performance, energy efficiency, and accessible DIY installation process. One reviewer reported a serious refrigerant line failure due to a flare joint defect, and another noted a minor temperature sensor inaccuracy, but the majority of customers report reliable long-term performance and highlight responsive customer service.
Pros & Cons
- Extremely quiet operation — multiple reviewers say they had to physically check whether the unit was running
- Effective cooling and heating performance, including during heat waves, cold snaps, and high humidity
- Significant energy savings compared to window units and wall heaters, with one buyer reporting electric bill cut in half
- Responsive and helpful customer service, including prompt part replacement and partial refunds when needed
- DIY-friendly installation aided by included templates, online videos, and manageable component design
- One verified case of flare joint failure causing complete refrigerant loss, described as a manufacturing defect
- Temperature sensor inaccuracy requiring a 4°F setpoint adjustment to reach actual desired temperature
- Unit runs continuously even after reaching set temperature in at least one installation
- Installation manual lacks clarity in certain areas, particularly around the vacuuming/evacuation process
- No on-board control panel on the indoor unit — operation is entirely dependent on the remote control
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