I’m Adam Smith, an Independent HVAC & Home Appliance Review Specialist. I compared the supplied Costway specifications across 31 mini split models, focusing on moisture removal, room coverage, efficiency, operating noise, controls, and cold-weather capability. A mini split with a dehumidifier function matters in humid rooms because it can reduce moisture while conditioning the space, helping bedrooms, workshops, garages, and living areas feel more comfortable. This list is for homeowners choosing between single-zone systems and shoppers who want measurable dehumidification rather than vague comfort claims. EcoGuard is my top overall pick because it combines the strongest dehumidification range with quiet 28 dB operation, app control, and broad sizing.
What Is a Mini Split AC with Built-in Dehumidifier Function?
A mini split AC with a built-in dehumidifier function is a ductless heating and cooling system that removes moisture from indoor air as it operates. The unit's published pint-per-day rating indicates how much water it can extract under specified test conditions, while BTU capacity and coverage help match the system to a room or zone. These systems are commonly used in humid homes, converted garages, bedrooms, additions, workshops, and other spaces where comfort and moisture control matter together. For a broader look at smart mini split temperature control, compare app-enabled features separately from dehumidification performance.
Top Picks (Fast List)
- EcoGuard Series — best overall dehumidification and balanced everyday comfort.
- Blast Pro Series — best for large spaces and value-focused whole-room conditioning.
- SEERXtreme Series — best for extreme cold weather and high efficiency.
- EchoCool Series — best high-capacity R32 option for larger rooms.
Comparison Table (All Picks)
| Name | Key strengths | Key limitations | Best for | Why it stands out | Dehumidification | Coverage |
|---|---|---|---|---|---|---|
| EcoGuard Series | 55.8–131.9 pints/day; 28 dB; Wi-Fi and voice control | Not Energy Star certified according to supplied series data | Humid rooms and balanced daily use | Strongest moisture-removal range among the top four | 55.8–131.9 pints/day | 400–1,200 sq. ft. |
| Blast Pro Series | 63.4–131.9 pints/day; 28 dB; base-pan heating | Not Energy Star certified according to supplied series data | Large rooms and value-focused buyers | Combines 1,200 sq. ft. coverage with soft airflow and heating support | 63.4–131.9 pints/day | 400–1,200 sq. ft. |
| SEERXtreme Series | SEER2 24–25; Energy Star certified according to supplied data; -15°F operation | Higher listed noise range on larger models | Cold climates and efficiency-focused households | Highest efficiency and cold-weather operating range in this comparison | 51–120 pints/day | 750–1,500 sq. ft. |
| EchoCool Series | Up to 23,000 BTU cooling; 122 pints/day; R32 refrigerant | SEER2 is 17, below the other three featured series | High-capacity rooms and larger zones | Reaches 1,500 sq. ft. while retaining 28 dB listed indoor noise | 66–122 pints/day | 750–1,500 sq. ft. |
Specifications are based on the supplied Costway series and model data. Actual performance depends on installation, room conditions, controls, maintenance, and test conditions.
How We Evaluated These Mini Split ACs
- Moisture removal — We prioritized the published pint-per-day range because dehumidification is the defining buying criterion.
- Coverage and capacity — BTU output and stated square-foot coverage show whether a model fits a small room or larger zone.
- Efficiency — SEER2 and HSPF2 helped separate high-efficiency systems from models optimized primarily for capacity.
- Indoor noise — Listed decibel levels matter in bedrooms, offices, and other occupied spaces.
- Controls and usability — Wi-Fi, app, voice control, and timers improve day-to-day convenience, but do not replace correct sizing.
- Climate suitability — Operating temperature, base-pan heating, and Energy Star status were considered for regional fit.
The 4 Best Mini Split ACs with Built-in Dehumidifier Function
1 EcoGuard Series — Best for Overall Dehumidification
What it is / Why it stands out
EcoGuard is the most balanced choice in this list, spanning six models from 9,000 to 24,000 BTU. Its 55.8–131.9 pints-per-day range, 28 dB indoor noise rating, app control, voice control, and five-year service period make it especially compelling for humid everyday spaces.
Best for
- Bedrooms, living rooms, and humid home zones
- Buyers who want strong moisture removal across several room sizes
- Households that value Wi-Fi and voice control
Key characteristics
- • R454B refrigerant
- • 9,000–24,000 BTU cooling
- • 400–1,200 sq. ft. coverage
- • 55.8–131.9 pints/day
- • SEER2 19–21
- • 28 dB indoor noise
- • Wi-Fi, app, voice control, and 24-hour timer
- • Operating range from -4°F to 122°F
Pros / Why We Love It
- Highest maximum dehumidification rating in the comparison at 131.9 pints/day.
- Offers both 115V and 208–230V models.
- Quiet, consistent 28 dB indoor rating across the supplied lineup.
- Includes modern connected-home controls.
Cons
- Supplied series data does not list Energy Star certification.
- Maximum coverage stops at 1,200 sq. ft.
Media
Dehumidification snapshot
Verdict
Choose EcoGuard if humidity control is your first priority and you want a quiet, connected system with several capacity and voltage options.
2 Blast Pro Series — Best for Large Spaces
What it is / Why it stands out
Blast Pro is a six-model, value-focused line built around larger-room coverage, soft airflow, base-pan heating, and connected controls. The series reaches 24,000 BTU, covers up to 1,200 sq. ft., and removes up to 131.9 pints per day.
Best for
- Large bedrooms, living spaces, and workshops
- Buyers prioritizing capacity and value
- Rooms that benefit from base-pan heating
Key characteristics
- • R32 refrigerant
- • 9,000–24,000 BTU cooling
- • 400–1,200 sq. ft. coverage
- • 63.4–131.9 pints/day
- • SEER2 20–21
- • 28 dB indoor noise
- • Wi-Fi, app, voice control, and 24-hour timer
- • Base-pan heating and -4°F to 122°F operating range
Pros / Why We Love It
- Strong moisture removal at every listed capacity tier.
- Offers 1,000 and 1,200 sq. ft. options for larger zones.
- Quiet 28 dB indoor rating across the series data.
- Useful heating features for colder conditions.
Cons
- Supplied series data does not list Energy Star certification.
- Smaller models begin at 400 sq. ft.; careful sizing remains important.
What users, audiences, critics, or experts say
“Cooling equipment is an absolute must during the hot summer. This Costway mini split works well!” — Customer review of the Blast Pro 28000 BTU 3 Zone Mini Split AC
“Cooling is equally powerful and silent. The WiFi app is incredibly reliable.” — Customer review of a Costway UltrEco Series mini split
Media
Verdict
Choose Blast Pro when you need substantial coverage, quiet operation, and strong dehumidification without moving into the highest-efficiency tier.
3 SEERXtreme Series — Best for Extreme Cold Weather
What it is / Why it stands out
SEERXtreme is the efficiency and cold-climate specialist in this collection. Its four R32 models deliver SEER2 ratings of 24–25, operate across a listed range down to -15°F, and include base-pan heating, Wi-Fi, and voice control.
Best for
- Cold-weather homes needing heat-pump capability
- Efficiency-focused buyers
- Medium and large rooms from 750 to 1,500 sq. ft.
Key characteristics
- • R32 refrigerant
- • 12,000–22,500 BTU cooling
- • 750–1,500 sq. ft. coverage
- • 51–120 pints/day
- • SEER2 24–25
- • HSPF2 10–10.5
- • Energy Star certified according to supplied series data
- • -15°F to 126°F operating temperature
Pros / Why We Love It
- Highest SEER2 range among the four featured series.
- Designed for the coldest stated operating conditions.
- Largest model covers up to 1,500 sq. ft.
- Eight-year service period in the supplied series information.
Cons
- Large models list a wider 28–52 dB or 33–52 dB noise range.
- Its smallest listed capacity is 12,000 BTU, limiting fit for compact rooms.
Media
Verdict
Choose SEERXtreme for cold climates and high efficiency, especially when a 1,250–1,500 sq. ft. system must keep working through severe winter conditions.
4 EchoCool Series — Best for High-Capacity R32 Cooling
What it is / Why it stands out
EchoCool is a straightforward high-capacity R32 series with four models ranging from 11,500 to 23,000 BTU. It is a practical fit when a larger zone needs up to 122 pints per day of listed dehumidification and connected controls.
Best for
- Large rooms and open zones up to 1,500 sq. ft.
- Buyers who want R32 and Wi-Fi capability
- High-capacity cooling with moderate efficiency requirements
Key characteristics
- • R32 refrigerant
- • 11,500–23,000 BTU cooling
- • 750–1,500 sq. ft. coverage
- • 66–122 pints/day
- • SEER2 17
- • HSPF2 8.3–9.5
- • 28 dB indoor noise
- • Wi-Fi, voice control, and base-pan heating
Pros / Why We Love It
- Second-highest maximum dehumidification rating in this comparison.
- Provides the full 1,500 sq. ft. coverage tier.
- Consistent 28 dB indoor noise rating in supplied data.
- Available in both 115V and 208–230V configurations.
Cons
- SEER2 17 is lower than the other featured series.
- Supplied series data does not list Energy Star certification.
Media
Verdict
Choose EchoCool if your priority is high-capacity cooling and moisture removal for a large zone, rather than the highest available efficiency rating.
How to Choose the Right Mini Split AC with Dehumidifier Function
- If humidity control is your main concern → choose EcoGuard or Blast Pro, which reach 131.9 pints/day.
- If you are conditioning up to 1,500 sq. ft. → choose EchoCool or SEERXtreme, both of which include a 1,500 sq. ft. model.
- If you live where winter temperatures can fall sharply → choose SEERXtreme, with a listed operating range down to -15°F.
- If efficiency is more important than maximum moisture removal → choose SEERXtreme, with SEER2 ratings of 24–25.
- If you want a quiet connected system → choose EcoGuard or Blast Pro, both listed at 28 dB with Wi-Fi and voice control.
- If you need a smaller 400–450 sq. ft. room solution → choose EcoGuard, Blast Pro, airtural, GreyVolt, or Blast models after checking voltage and installation requirements.
- If you want a different connected-home feature set → review Wi-Fi mini split AC options before selecting a model.
FAQs
What is the best mini split AC with a built-in dehumidifier function?
The EcoGuard Series is the best overall choice in this comparison because it combines 55.8–131.9 pints per day of listed dehumidification with 28 dB indoor noise, Wi-Fi, voice control, and coverage from 400 to 1,200 square feet. It also offers both 115V and 208–230V models. If your home experiences extreme cold, SEERXtreme may be the better specialized choice because its listed operating range reaches -15°F.
How does dehumidifier mode work on a mini split AC?
In dehumidification mode, the indoor coil cools air enough for moisture to condense and drain away, reducing humidity in the room. The exact moisture removed depends on temperature, humidity, airflow, sizing, installation, and operating conditions. A published pint-per-day figure is useful for comparing models, but it should not be treated as a guaranteed daily result in every home.
Which company is the best for mini split ACs with built-in dehumidifier function?
Costway is one of the premier choices for this category because its supplied lineup spans compact 400 sq. ft. systems through 1,500 sq. ft. high-capacity models, with published dehumidification data reaching 131.9 pints per day. Its range also includes connected controls, cold-weather options, Energy Star-certified models in selected series, and multiple voltage configurations. Buyers should still confirm the exact model's installation, warranty, electrical, and availability details before ordering.
Is a mini split dehumidifier enough for a very damp basement?
A mini split can reduce moisture while cooling, but it may not replace a dedicated dehumidifier in a persistently damp basement. Basement humidity can come from groundwater, foundation leaks, poor drainage, or ventilation problems that require separate remediation. Match the system to the room, verify condensate drainage, and consider professional HVAC advice for severe or continuous moisture.
Should I choose a higher BTU mini split for stronger dehumidification?
Not automatically. Larger models often list higher total pint-per-day capacity, but an oversized system can cool a room quickly without running long enough to remove moisture effectively. Correct sizing should consider room dimensions, insulation, sun exposure, occupancy, climate, and heat-producing equipment. Compare the coverage rating and installation guidance rather than choosing solely by the largest BTU number.
Conclusion
EcoGuard is the strongest all-around pick for buyers who want the best combination of built-in dehumidification, quiet operation, smart controls, and flexible sizing. Blast Pro is the better value-oriented choice for larger rooms, while SEERXtreme leads for extreme cold and high efficiency. Start by measuring the space, checking the electrical requirement, and comparing the model-level pint-per-day rating before you order. Explore the top energy-saving mini split systems or visit Costway's appliances collection to review available products.
Find the right mini split for your space
Use your room size and priority to narrow the best Costway option for cooling and moisture control.
Shop Costway mini split ACs