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COSTWAY 12000 BTU Mini Split Air Conditioner & Heater, 115V WiFi Enabled 24 SEER2 Ductless Inverter AC Unit, Works w/Alexa, Cools Rooms Up to 750 Sq.Ft

TLDR Review: COSTWAY 12000 BTU Mini Split AC & Heater

By ShopSavvy Team

Published: May 27th, 2026

Pros

•Capable of cooling rooms up to 750 sq.ft., making it suitable for mediuized spaces
•Energfficient design significantly reduces reliance on central AC, saving on electricity bills
•Quiet operation, with minimal noise during use
•Provides effective heating for spaces like garages, even in very cold temperatures down to 0°F
•Uses environmentally friendly R32 refrigerant, which is more energfficient and eco-conscious
•Lightweight and relatively easy to install with personal tools and some basic HVAC knowledge
•Compatible with WiFi and Alexa, allowing remote control and smart home integration (despite some setup issues)
•Can cool outdoor temperatures up to 95°F comfortably
•Good overall build quality and inspection before shipping
•Suitable for specific applications like cooling inverters or smalo-medium spaces

Cons

•WiFi setup and connectivity are challenging; many users report difficulty connecting or maintaining the connection
•Customer support response times are slow and troubleshooting guidance is limited
•Some reviews mention the unit ceasing to cool effectively after a short period
•The included instruction manual is basic; installation videos are subpar, requiring external tutorials
•Remote control lacks instructions, and some features are ambiguous or nounctional
•Lonerm durability and performance remain uncertain based on user feedback
•Not recommended for very cold climates below 25°F, despite good heating in milder cold
•The fan may not blow as hard as typical window units, leading to less aggressive airflow
•The tech support delay and Wi issues could lead to prolonged frustration
•Hefty initial investment in tools/materials for DIY installation, which can be costly

Bottom Line

This COSTWAY mini split offers solid cooling and heating performance for medium-sized spaces and is energy-efficient, making it an attractive choice for those looking to lower energy costs. However, its WiFi setup and ongoing connectivity issues, coupled with slow customer support, can be frustrating. If smart features are a priority for you and you're comfortable troubleshooting, it could be a good option. Otherwise, you might want to explore alternatives like <component-button-product identifierProduct="12345-67890...">, which have more straightforward support or more reliable connectivity.

How we researched this

About this review: We pulled together findings from professional reviews and hundreds of user reviews, and cross-referenced them with ShopSavvy's pricing data from 2 retailers to give you the short version.

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