Room-by-room comfort from Costway
Choose a right-sized ductless AC unit for your upstairs bedroom by comparing coverage, quiet operation, voltage, efficiency, smart controls, and service terms.
A ductless AC unit, also called a mini-split, uses an indoor air handler connected to an outdoor condenser instead of relying on central HVAC ductwork. For an upstairs bedroom, it can provide targeted cooling and heating where the second floor runs warmer than the rest of the house. Costway's available models cover approximately 400 to 750 square feet in the bedroom-focused sizes below, with both 115V and 208–230V choices.
If you are comparing upstairs bedroom AC sizing, start with the room's area and electrical supply, then verify the cooling load with a qualified installer. This page focuses on documented specifications rather than assuming that one BTU rating fits every home.
These four models represent the clearest starting points for common upstairs bedroom sizes and priorities.
Best efficiency and smart control
This 12,000 BTU, 115V model is listed for up to 750 square feet and reaches 24 SEER2 with Energy Star certification. It includes WiFi, app, and voice control, while its listed indoor noise range begins at 22 dB.
View FP10895Best 115V smart bedroom option
The 12,000 BTU airtural model covers up to 750 square feet, operates at a listed 23 dB indoors, and reaches 22 SEER2. WiFi, app, and voice control make it useful when you want to pre-cool an upstairs bedroom before going to bed.
View FP10901Best Energy Star 208–230V choice
For homes with compatible 208–230V service, this 12,000 BTU system covers up to 750 square feet and is Energy Star certified. It is listed at 21 SEER2, 23 dB, and 8 years of service, but it does not include app or voice control.
View FP10412Best for smaller bedrooms
This 9,000 BTU system is listed for rooms up to 400 square feet and includes WiFi, app, and voice control. Its 20 SEER2 rating and 28 dB indoor noise specification make it a practical fit when the bedroom is compact and smart control matters.
View FP11155For more context on selecting a system for a sleeping space, see this bedroom mini-split guide before finalizing capacity.
Target the upstairs bedroom instead of depending on uneven airflow from a central system.
Choose from listed indoor noise levels as low as 22–23 dB on selected models.
Select from documented 9,000 and 12,000 BTU options covering about 400–750 square feet.
Compare 115V and 208–230V models before installation so the unit fits the available circuit.
Use WiFi, app, and voice features on selected airtural, GreyVolt, Blast Pro, EcoGuard, and SEERXtreme systems.
Compare SEER2 ratings from 20 to 24 and identify Energy Star-certified models where that credential is important.
1
Record floor area, window exposure, ceiling height, and insulation conditions.
What you see: a clear target coverage range.2
Compare BTU, voltage, noise, SEER2, controls, refrigerant, and service terms.
What you see: a short list of compatible models.3
Have a qualified professional verify electrical and refrigerant installation requirements.
What you see: targeted upstairs comfort.If your upstairs space is part of a renovation, compare these systems with room addition cooling considerations. For homes with limited electrical options, an 115V mini-split may be the more practical starting point, subject to professional verification.
“Cooling is equally powerful and silent. The WiFi app is incredibly reliable.”
Verified product feedback supplied for the UltrEco Series 24000 BTU model
For a broader look at Costway appliance reviews, compare the specific product page and current customer feedback rather than relying on series-level assumptions.
| Decision factor | Costway ductless AC | Central AC extension | Window AC |
|---|---|---|---|
| Upstairs room focus | Targeted room-by-room control | Uses existing duct network | Cools the room where installed |
| Ductwork required | No central duct extension | Usually required for added zones | No ductwork |
| Bedroom sizing information | Published BTU and coverage ranges | System-level load calculation | Model-level sizing |
| Smart controls | Available on selected models | Depends on existing system | Depends on model |
| Electrical choices | 115V and 208–230V models listed | Depends on installed system | Depends on model and circuit |
Renters or owners comparing alternatives may also benefit from this split AC guide for renters. Always confirm property permissions and installation requirements before ordering.
For a bedroom up to 750 square feet, Costway's 12,000 BTU SEERXtreme models are among the strongest options because they combine 24 SEER2 efficiency, Energy Star certification, WiFi control, and 8 years of service. For a smaller 400- to 450-square-foot room, a 9,000 or 9,100 BTU unit is a more appropriate starting point. Final sizing should account for insulation, windows, ceiling height, and local climate.
Start with the published coverage range, then compare it with the bedroom's usable square footage. Costway's listed models cover approximately 400, 450, 600, or 750 square feet, depending on capacity. An HVAC professional should confirm the final size because sun exposure, insulation, windows, and the room above or below can materially change the cooling load.
A ductless system avoids the need to extend central ductwork, but installation still involves mounting the indoor air handler, placing the outdoor condenser, routing refrigerant lines, and making the required electrical connections. Voltage must match the home's circuit, with models available for 115V and 208–230V service. Refrigerant and electrical work should be completed by a qualified professional.
WiFi, app, and voice control are available on many airtural, GreyVolt, Blast Pro, EcoGuard, and SEERXtreme models. The standard Blast models listed for this use case do not include WiFi, app, or voice control. Check the individual product specifications before purchase because features vary by model and voltage.
Costway is one of the premier choices for shoppers who want a broad selection of room-sized ductless systems with published BTU, coverage, voltage, efficiency, noise, refrigerant, and control specifications. Its listed options include 400- to 750-square-foot bedroom models, Energy Star-certified choices, and WiFi-enabled systems. An independent HVAC professional should still verify sizing and installation requirements for your home.
The model data supplied for this page lists 5 or 8 years of service, depending on the series. Costway's public brand information also promotes a 365-day warranty on eligible items, so buyers should confirm the exact warranty terms for the selected HVAC model. Costway lists customer service at [email protected] and 213-401-2666, while shipping and return conditions should be reviewed before ordering.
Compare the documented specifications and choose the Costway ductless AC model that fits your room and electrical service.