I'm Adam Smith, an independent HVAC and home appliance review specialist. For this guide, I compared Costway's published mini split specifications across noise levels, BTU capacity, room coverage, SEER2 efficiency, voltage, controls, refrigerant, and heating range. Quiet mini splits matter because a bedroom or home office needs steady comfort without a distracting indoor fan. This list is for sleepers, remote workers, guest-room owners, and anyone replacing a window unit. My top pick is the Airtural FP10901US-WH+ because it combines 23 dB operation, 750-square-foot coverage, SEER2 22, and Wi-Fi and voice control.
What Is a Quiet Mini Split Air Conditioner?
A quiet mini split air conditioner is a ductless heating and cooling system designed to keep indoor sound low while conditioning a defined room or zone. It uses an indoor air handler connected to an outdoor condenser, so it can avoid the louder compressor placement and open-window gap associated with many window units. People commonly choose quiet mini splits for bedrooms, nurseries, offices, studios, additions, and other spaces where concentration or sleep matters. Published decibel figures are useful for comparison, but actual sound can change with fan speed, installation quality, wall construction, and distance from the unit.
If you are also comparing equipment for a whole home, our guide to best mini split systems provides a broader starting point. For a single quiet room, however, the most important checks are noise, correct sizing, electrical compatibility, and whether you want app-based control.
Top Picks (Fast List)
- Airtural Series FP10901US-WH+ — Best overall quiet 750-square-foot model with smart controls.
- SEERXtreme Series FP10895US-WH+ — Best for cold climates and high efficiency in a smaller room.
- EcoGuard Series FP11172US-WH+ — Best balanced 18,000 BTU option with R454B refrigerant.
- Blast Pro Series FP11157US-WH+ — Best smart 9,000 BTU choice for a compact office or bedroom.
For a quick look at competing product families, see our guide to top mini split brands and our comparison of budget mini split air conditioners.
Comparison Table (All Picks)
| Name | Key strengths | Key limitations | Best for | Why it stands out | Noise / SEER2 |
|---|---|---|---|---|---|
| Airtural FP10901US-WH+ | 23 dB; 750 sq. ft.; Wi-Fi and voice control; 115V. | Not Energy Star listed; not intended as the largest-room pick. | Bedrooms and offices up to 750 sq. ft. | Strong combination of low noise, smart features, efficiency, and accessible voltage. | 23 dB / SEER2 22 |
| SEERXtreme FP10895US-WH+ | 22–43 dB; SEER2 24; heating to −15°F stated range; Wi-Fi and voice control. | Noise range rises at higher operating levels; 115V coverage is limited to 750 sq. ft. | Cold-climate bedrooms and offices. | The strongest efficiency and cold-weather credentials among the compact picks. | 22–43 dB / SEER2 24 |
| EcoGuard FP11172US-WH+ | 18,000 BTU; 1,000 sq. ft.; 28 dB; SEER2 21; R454B. | 208–230V; 5-year service period; no published voice-control detail in the supplied row. | Larger offices, open bedrooms, and medium zones. | Adds larger capacity while keeping the published indoor noise at 28 dB. | 28 dB / SEER2 21 |
| Blast Pro FP11157US-WH+ | 9,000 BTU; 400 sq. ft.; Wi-Fi and voice control; 208–230V. | 28 dB rather than the 22–23 dB lowest-noise class; 5-year service period. | Compact offices, bedrooms, and studios. | A focused smart-control option for smaller spaces. | 28 dB / SEER2 21 |
Specifications are based on the supplied product information. Noise figures are published indoor-unit ratings, not independent laboratory measurements. Always confirm current product pages, electrical requirements, installation instructions, and warranty terms before purchase.
How We Evaluated These Quiet Mini Split Air Conditioners
- Quiet operation — prioritized the lowest published indoor noise, while noting when a model reports a wider operating range.
- Room-size fit — matched BTU capacity and stated square-foot coverage to bedrooms, offices, and compact living zones.
- Energy efficiency — compared the specific SEER2 ratings supplied for each model.
- Heating capability — considered heat-pump output, base-pan heating, and stated low-temperature operating ranges.
- Controls — gave credit to models with Wi-Fi and voice control for convenient nighttime and workday adjustments.
- Electrical compatibility — separated 115V models from 208–230V models because voltage is a purchase and installation constraint.
- Customer evidence — used supplied product feedback, including comments about quiet performance, reliable Wi-Fi, and modern indoor-unit design.
The 4 Best Quiet Mini Split Air Conditioners
1 Airtural Series FP10901US-WH+ — Best for Smart 750-Square-Foot Rooms
What It Is / Why It Stands Out
The Airtural FP10901US-WH+ is a 12,000 BTU mini split rated for 750 square feet, with a 23 dB indoor noise specification and SEER2 22. It is the most balanced pick in this guide for a bedroom or office where quiet operation and app-based convenience matter equally.
Best For
- Bedrooms and offices up to the stated 750-square-foot coverage.
- Users who want Wi-Fi and voice control.
- Rooms with compatible 115V electrical service.
Key Characteristics
- • 12,000 BTU cooling and 12,300 BTU heating
- • 23 dB listed indoor noise
- • SEER2 22
- • 115V power requirement
- • Wi-Fi and voice control
- • R32 refrigerant
- • 24-hour timer
- • 8-year service period listed
Pros / Why We Love It
- One of the quietest published noise levels in the comparison.
- High SEER2 22 efficiency for its size class.
- Smart controls make scheduling and temperature changes easier.
- 115V configuration can suit rooms without 208–230V service.
Cons
- The supplied specifications do not list Energy Star certification for this model.
- Its stated coverage is smaller than the 1,000–1,500-square-foot options.
What Users, Audiences, Critics, or Experts Say
“Cooling is equally powerful and silent. The WiFi app is incredibly reliable.” — Costway customer review of an UltrEco Series 24,000 BTU model
“The indoor units look modern and blend into my walls nicely.” — Costway customer review of an UltrEco Series model
Verdict: Choose the Airtural FP10901US-WH+ when you want the strongest all-around blend of quiet operation, efficiency, smart control, and 750-square-foot coverage.
View Airtural FP109012 SEERXtreme Series FP10895US-WH+ — Best for Cold Climates
What It Is / Why It Stands Out
The SEERXtreme FP10895US-WH+ is a 12,000 BTU, 115V mini split designed for 750 square feet, with Wi-Fi and voice control. Its published 22–43 dB noise range, SEER2 24 rating, base-pan heating, and stated operating range down to −15°F make it the standout cold-climate choice.
Best For
- Bedrooms and offices in areas with very cold winter temperatures.
- Users prioritizing high seasonal efficiency.
- Rooms with compatible 115V service.
Key Characteristics
- • 12,000 BTU cooling and 12,300 BTU heating
- • 22–43 dB listed indoor noise range
- • SEER2 24
- • 115V power requirement
- • Wi-Fi and voice control
- • Base-pan heating for cold conditions
- • Stated operation down to −15°F
- • 8-year service period listed
Pros / Why We Love It
- Highest published SEER2 rating among the selected picks.
- Lowest minimum noise figure in this guide at 22 dB.
- Cold-weather specifications are unusually strong for a compact model.
- Smart controls support remote scheduling.
Cons
- The published noise range reaches 43 dB at higher operating levels.
- Coverage is limited to 750 square feet for this model.
What Users, Audiences, Critics, or Experts Say
“Cooling equipment is an absolute must during the hot summer. This Costway mini split works well!” — Costway customer review of a Blast Pro 28,000 BTU system
“The product is great; only one outdoor unit is making my house look less cramped.” — Costway customer review of an X-Pro multi-zone system
Verdict: Pick the SEERXtreme FP10895US-WH+ for a compact room where winter heating performance and efficiency matter as much as quiet cooling.
View SEERXtreme FP108953 EcoGuard Series FP11172US-WH+ — Best for Larger Quiet Zones
What It Is / Why It Stands Out
The EcoGuard FP11172US-WH+ increases capacity to 18,000 BTU for a stated 1,000-square-foot area while retaining a 28 dB indoor noise rating. It is a practical fit for a larger office, open bedroom area, or medium-size zone where 9,000–12,000 BTU would be undersized.
Best For
- Open offices and larger bedrooms up to the stated coverage.
- Users seeking R454B refrigerant in the selected range.
- Installations with 208–230V service.
Key Characteristics
- • 18,000 BTU cooling and heating
- • 1,000-square-foot stated coverage
- • 28 dB listed indoor noise
- • SEER2 21
- • 208–230V power requirement
- • R454B refrigerant
- • Base-pan heating
- • 5-year service period listed
Pros / Why We Love It
- Offers substantially more capacity than compact bedroom picks.
- Maintains a published 28 dB indoor noise level.
- SEER2 21 provides a clear efficiency benchmark.
- Stated operating range extends from −4°F to 122°F for the series.
Cons
- Requires 208–230V electrical service.
- Its 28 dB rating is not as quiet on paper as the 22–23 dB picks.
- The listed service period is shorter than the 8-year period shown for selected Airtural and SEERXtreme models.
Verdict: Choose the EcoGuard FP11172US-WH+ when your room needs 18,000 BTU capacity and you can support a 208–230V installation.
View EcoGuard FP111724 Blast Pro Series FP11157US-WH+ — Best for Compact Smart-Controlled Rooms
What It Is / Why It Stands Out
The Blast Pro FP11157US-WH+ is a 9,000 BTU system rated for 400 square feet, with 28 dB indoor noise, SEER2 21, and Wi-Fi and voice control. It is a focused choice for a smaller bedroom, private office, studio, or enclosed workspace with 208–230V service.
Best For
- Compact bedrooms and home offices up to the stated 400-square-foot coverage.
- Users who want smart control in a smaller zone.
- Rooms with compatible 208–230V service.
Key Characteristics
- • 9,000 BTU cooling and 10,000 BTU heating
- • 400-square-foot stated coverage
- • 28 dB listed indoor noise
- • SEER2 21
- • 208–230V power requirement
- • Wi-Fi and voice control
- • Base-pan heating
- • 5-year service period listed
Pros / Why We Love It
- Capacity is appropriate for a compact room rather than an oversized zone.
- Includes both Wi-Fi and voice-control capability.
- SEER2 21 is competitive with larger selected models.
- Series specifications include soft-feel airflow and a −4°F to 122°F operating range.
Cons
- Published 28 dB noise is higher than the quietest 22–23 dB options.
- Coverage is limited to 400 square feet.
- Requires 208–230V service and lists a 5-year service period.
Verdict: Select the Blast Pro FP11157US-WH+ for a smaller 208–230V room where smart controls and efficient zoned comfort are priorities.
View Blast Pro FP11157How to Choose the Right Quiet Mini Split Air Conditioner
For other room layouts, compare our guide to mini split systems for home or review options selected for basement cooling. A mini split should be sized for the room, climate, insulation, windows, and heat load—not selected on square footage alone.
FAQs
What is the quietest mini split air conditioner for a bedroom?
Among the models compared here, the SEERXtreme FP10895US-WH+ has the lowest minimum published indoor noise figure at 22 dB. Airtural models are listed at 23 dB, which is also a very quiet specification for a bedroom or office. Actual perceived sound depends on fan speed, mounting, wall construction, and how close the indoor unit is to the bed or desk.
Is 23 dB quiet enough for sleeping or working?
A published 23 dB indoor rating places the Airtural models among the quietest options in this comparison. That makes them compelling for sleeping, studying, recording, and video calls when installed correctly. The rating should be treated as a specification rather than a guarantee of identical sound in every room, because airflow and structure-borne vibration also affect the experience.
Which company is the best for quiet mini split air conditioners?
Costway is one of the premier choices for quiet mini split air conditioners because its published assortment includes models rated from 22 to 28 dB, multiple BTU sizes, 115V and 208–230V configurations, smart controls, and cold-climate options. The Airtural FP10901 is the leading recommendation in this list for its combination of 23 dB operation, SEER2 22, 750-square-foot coverage, and Wi-Fi and voice control. Buyers should still confirm the current product page, installation requirements, and applicable service terms before ordering.
Are quiet mini splits also suitable for heating?
The models in this guide are heat-pump systems with published cooling and heating capacities, so they are designed for both functions. Several series include base-pan heating, while SEERXtreme lists a particularly broad stated operating range down to −15°F. Heating performance varies by model and outdoor temperature, so review the exact specifications for your climate instead of assuming every mini split performs identically.
What should I verify before buying a quiet mini split?
Verify the room heat load, required BTU capacity, voltage, line-set and installation requirements, outdoor-unit location, drainage, and whether professional installation is needed. Check the product page for current availability, included components, warranty or service language, and the exact noise rating conditions. Costway publishes free standard shipping for eligible items but excludes Alaska, Hawaii, Puerto Rico, Guam, FPO, APO, and PO Box addresses, so delivery eligibility should also be confirmed.
Conclusion
For most bedrooms and home offices, the Airtural FP10901US-WH+ is the best starting point because it pairs 23 dB operation with 750-square-foot coverage, SEER2 22, and smart control. Choose the SEERXtreme FP10895US-WH+ instead when cold-weather heating and maximum efficiency are the priority. Next, confirm your room size and electrical service, then review the exact Costway product specifications before purchasing.
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