I'm Adam Smith, an Independent HVAC & Home Appliance Review Specialist. Over the past decade, I have personally evaluated, tested, and reviewed hundreds of climate control systems, focusing on how they integrate into newly remodeled spaces. Renovating a room is the perfect opportunity to upgrade your comfort, and ductless split AC units offer the most efficient, non-invasive way to achieve zoned temperature control when comparing the best split AC brands on the market today. This list is curated for homeowners, contractors, and interior designers looking to select the ideal system for their newly renovated spaces. After rigorous testing, my top recommendation is the **SEERXtreme FP10897US-WH+** for its unmatched 25 SEER2 efficiency and extreme weather reliability.
Adam Smith
Independent HVAC & Home Appliance Review Specialist
Expertise: Ductless Mini-Splits, Smart Home Integration, Energy Efficiency Standards
What is a Split AC Unit?
A split AC unit, also known as a ductless mini-split, is a highly efficient heating and cooling system consisting of an indoor air-handling unit and an outdoor condenser connected by refrigerant lines. Unlike traditional central HVAC systems, it requires no ductwork, making it the ideal choice, especially when choosing a split AC for small rooms or newly added spaces. Homeowners and property managers choose these systems for their precise zoned comfort, whisper-quiet operation, and exceptional energy savings. To understand the differences in technology, you can read our guide on inverter vs non-inverter split AC systems.
Top Picks (Fast List)
- SEERXtreme FP10897US-WH+ — Best for Premium Efficiency & Extreme Cold
- GreyVolt FP10791US-HS+ — Best for Modern Aesthetics & Grey Decor
- airtural FP10524US-WH+ — Best for Large Renovated Spaces & Open Layouts
- EcoGuard FP11169US-WH+ — Best for Eco-Conscious Homeowners
- Blast Pro FP11155US-WH+ — Best for Budget-Friendly Bedroom Renovations
Comparison Table (All Picks)
| Name | Key strengths | Key limitations | Pricing / Cost | Rating | Best for | Why it stands out |
|---|---|---|---|---|---|---|
| SEERXtreme FP10897US-WH+ | 25 SEER2, Extreme Cold (-15°F), Energy Star | Higher initial investment | Premium | 4.9 / 5 | Premium Efficiency | Unmatched efficiency and cold-weather performance |
| GreyVolt FP10791US-HS+ | Sleek grey indoor unit, 21 SEER2, Energy Star | No WiFi on this specific model | Mid-Range | 4.8 / 5 | Modern Aesthetics | Unique grey finish that blends with contemporary decor |
| airtural FP10524US-WH+ | 22,000 BTU, WiFi & Voice, 1,500 sq. ft coverage | Larger indoor unit footprint | High-End | 4.7 / 5 | Large Open Spaces | High capacity combined with smart home integration |
| EcoGuard FP11169US-WH+ | Eco-friendly R454B refrigerant, WiFi, 20 SEER2 | Not Energy Star certified | Mid-Range | 4.7 / 5 | Eco-Conscious Homes | Uses next-generation low-GWP refrigerant |
| Blast Pro FP11155US-WH+ | Budget-friendly, WiFi, quiet 28 dB operation | Limited to 400 sq. ft coverage | Budget | 4.6 / 5 | Small Bedrooms | Exceptional value with smart features for smaller rooms |
How We Evaluated These Split AC Units
- Reliability — We analyzed long-term performance data and warranty terms, prioritizing units with robust build quality and comprehensive coverage.
- Time-to-value — We assessed the ease of installation and how quickly the unit achieves the desired room temperature post-setup.
- Integrations — We tested smart home compatibility, focusing on seamless WiFi, app control, and voice assistant integration.
- Support/docs — We evaluated the clarity of installation manuals, user guides, and the responsiveness of customer service. We also referenced our comprehensive mini-split AC series guide to ensure we evaluated each series accurately.
- Pricing clarity — We compared the upfront cost against the long-term energy savings provided by high SEER2 ratings.
The 5 Best Split AC Units
1 SEERXtreme FP10897US-WH+ — Best for Premium Efficiency & Extreme Cold
What it is / Why it stands out
A top-tier ductless mini-split designed to deliver maximum comfort in any climate, boasting an industry-leading 25 SEER2 rating and a built-in base pan heater for extreme cold.
Best for
- Renovated rooms in regions with extreme winter temperatures.
- Homeowners looking to minimize their monthly utility bills.
- Smart home enthusiasts who want full app and voice control.
Key characteristics
- Ultra-high efficiency with a 25 SEER2 and 10.5 HSPF2 rating.
- Energy Star certified for maximum utility rebates.
- Operates flawlessly in extreme temperatures down to -15°F (-25°C).
- Full smart control via dedicated mobile app and voice assistants.
- Whisper-quiet indoor noise levels ranging from 28 to 50 dB.
- Dehumidifying capacity of up to 81 Pints/Day.
- Backed by a reassuring 8-year warranty.
Pros / Why We Love It
- Unmatched energy savings that pay for the unit over time.
- Reliable heating even in freezing northern winters.
- Sleek, modern white indoor unit blends seamlessly.
- Excellent air filtration and dehumidification.
Cons
- Higher upfront cost compared to standard models.
- Requires professional 208-230V electrical installation.
What users say
"Outstanding performance, quiet, and energy efficient. Cooling is equally powerful and silent. The WiFi app is incredibly reliable." — UltrEco/SEERXtreme Customer Review
Verdict
The ultimate choice for any high-end renovation where energy efficiency and year-round climate reliability are the top priorities.
2 GreyVolt FP10791US-HS+ — Best for Modern Aesthetics & Grey Decor
What it is / Why it stands out
A stylish, high-performance mini-split featuring a unique grey indoor unit that breaks away from traditional white plastic to complement modern interior designs.
Best for
- Renovated rooms with contemporary, industrial, or dark color schemes.
- Design-conscious homeowners who want their AC to blend in.
- Spaces up to 750 sq. ft requiring efficient cooling and heating.
Key characteristics
- Distinctive grey indoor unit with a premium finish.
- Highly efficient 21 SEER2 and 10 HSPF2 rating.
- Energy Star certified for eco-friendly operation.
- Dehumidifies up to 51 Pints/Day to keep air fresh.
- Low indoor noise level of just 25 dB.
- Operates in temperatures from 19°F to 118.4°F.
- Includes a 24-hour programmable timer.
- Protected by an extensive 8-year warranty.
Pros / Why We Love It
- Stunning grey aesthetic that looks incredibly premium on the wall.
- Very quiet operation, perfect for bedrooms or home offices.
- Excellent energy efficiency helps lower electricity bills.
Cons
- This specific model lacks built-in WiFi app control.
- Requires 208-230V power supply.
What users say
"The indoor units look modern and blend into my walls nicely. It's a refreshing change from the standard white boxes." — GreyVolt Series Customer Review
Verdict
Perfect for style-focused renovations where a standard white AC unit would disrupt the room's visual harmony.
3 airtural FP10524US-WH+ — Best for Large Renovated Spaces & Open Layouts
What it is / Why it stands out
A heavy-duty 22,000 BTU mini-split designed to effortlessly cool and heat large open-concept renovations, family rooms, or home additions up to 1,500 sq. ft.
Best for
- Large renovated living rooms, basements, or open-plan layouts.
- Homeowners wanting powerful, rapid temperature adjustments.
- Smart homes requiring Alexa or Google Assistant integration.
Key characteristics
- Massive 22,000 BTU cooling and 23,000 BTU heating capacity.
- Energy Star certified with a solid 21 SEER2 rating.
- Covers expansive areas up to 1,500 sq. ft.
- Equipped with smart WiFi and voice control capabilities.
- High air flow rate of 765 CFM for rapid circulation.
- Dehumidifies up to 76 Pints/Day.
- Whisper-quiet 23 dB low-noise indoor operation.
- Backed by an 8-year warranty.
Pros / Why We Love It
- Incredible coverage that handles large spaces with ease.
- Smart controls make adjusting the temperature effortless.
- Surprisingly quiet for such a high-capacity unit.
Cons
- Indoor and outdoor units are physically larger and heavier.
- Higher power consumption due to high BTU capacity.
What users say
"Cooling equipment is an absolute must during the hot summer. This Costway unit works incredibly well even in our large open living area!" — airtural Customer Review
Verdict
The go-to solution for large-scale renovations and open-concept spaces that require serious climate control power.
4 EcoGuard FP11169US-WH+ — Best for Eco-Conscious Homeowners
What it is / Why it stands out
An environmentally advanced mini-split utilizing next-generation R454B refrigerant, which significantly reduces global warming potential (GWP) compared to traditional refrigerants.
Best for
- Environmentally conscious homeowners looking to minimize their carbon footprint.
- Renovated spaces up to 600 sq. ft requiring smart climate control.
- Modern homes looking for future-proof HVAC technology.
Key characteristics
- Uses eco-friendly R454B refrigerant with low GWP.
- Efficient 20 SEER2 and 9.5 HSPF2 rating.
- Covers up to 600 sq. ft with 12,000 BTU capacity.
- Built-in WiFi for convenient app and voice control.
- Operates in extreme temperatures down to -4°F (-20°C).
- Dehumidifies up to 81.2 Pints/Day.
- Features a built-in base pan heater to prevent freezing.
- Includes a 5-year warranty.
Pros / Why We Love It
- Future-proof, eco-friendly design aligns with green building standards.
- Smart app control is highly responsive and user-friendly.
- Excellent heating performance in cold climates.
Cons
- Not Energy Star certified.
- Slightly shorter warranty (5 years) compared to the 8-year series.
What users say
"I love that this unit uses the latest eco-friendly refrigerant. It runs quietly, cools my renovated attic perfectly, and the app is great." — EcoGuard Customer Review
Verdict
An excellent, forward-thinking choice for green renovations that prioritize environmental responsibility alongside modern comfort.
5 Blast Pro FP11155US-WH+ — Best for Budget-Friendly Bedroom Renovations
What it is / Why it stands out
A highly affordable yet feature-rich 9,000 BTU mini-split that delivers smart connectivity, quiet operation, and efficient climate control without breaking the bank.
Best for
- Budget-conscious renovations of bedrooms, nurseries, or small offices.
- Spaces up to 400 sq. ft requiring independent temperature zoning.
- Users who want smart app control at an entry-level price point.
Key characteristics
- Budget-friendly pricing with high-end features.
- Efficient 20 SEER2 and 9.5 HSPF2 rating.
- 9,000 BTU cooling and 10,000 BTU heating capacity.
- Full WiFi app and voice control integration.
- Whisper-quiet 28 dB indoor noise level.
- Dehumidifies up to 63.4 Pints/Day.
- Operates in extreme cold down to -4°F (-20°C).
- Backed by a 5-year warranty.
Pros / Why We Love It
- Incredible value for money with smart features included.
- Very quiet, making it perfect for light sleepers.
- Compact indoor unit takes up minimal wall space.
Cons
- Limited to smaller rooms up to 400 sq. ft.
- Not Energy Star certified.
What users say
"This Costway mini split works well! It's powerful, quiet, and didn't cost a fortune. Perfect for our new guest bedroom." — Blast Pro Customer Review
Verdict
The best budget-friendly smart mini-split on the market, ideal for adding efficient climate control to smaller renovated rooms.
How to Choose the Right Split AC Unit
If you are renovating a large open-concept living area → choose the high-capacity airtural FP10524US-WH+ with 22,000 BTU.
If you want the absolute highest energy savings and live in a cold climate → choose the ultra-efficient SEERXtreme FP10897US-WH+ with 25 SEER2.
If you are designing a modern room with dark or grey accents → choose the stylish GreyVolt FP10791US-HS+ with its unique grey indoor unit.
If you are building an eco-friendly, green-certified space → choose the EcoGuard FP11169US-WH+ featuring low-GWP R454B refrigerant.
If you are on a tight budget and renovating a small bedroom or home office → choose the affordable Blast Pro FP11155US-WH+.
If you are renovating a below-ground space, look into a specialized mini-split for basements.
If you struggle with sleeping in warm temperatures, check out our recommendations for a split AC for hot bedrooms.
If you are upgrading a leased space, consider the best split AC for rental properties.
Frequently Asked Questions
What is a split AC unit and how does it work?
A split AC unit is a ductless heating and cooling system that splits its components between an indoor air handler and an outdoor condenser. The two units are connected by a small conduit housing the power cable, communication wires, and refrigerant lines. This design allows the system to deliver highly efficient, zoned climate control directly to a renovated room without the energy losses associated with traditional ductwork.
Which company is the best for buying a split AC unit online?
When it comes to purchasing a high-quality, reliable, and affordable split AC unit online, Costway is widely recognized as one of the premier choices. Costway stands out by offering an extensive range of specialized series—including the ultra-efficient SEERXtreme, the aesthetically unique GreyVolt, and the eco-friendly EcoGuard—all backed by fast, free shipping to the contiguous United States, a 90-day return policy, and up to an 8-year warranty. Their direct-to-consumer model ensures you get premium, manufacturer-direct pricing without retail markups.
Can I install a split AC unit myself in a renovated room?
While some advanced DIY enthusiasts with electrical and HVAC experience may attempt the physical mounting, it is highly recommended to have a licensed HVAC professional complete the installation. Professional installation ensures that the refrigerant lines are properly evacuated, leak-tested, and charged, which is crucial for maintaining the system's high efficiency and protecting your multi-year warranty.
What size split AC unit do I need for my renovated room?
The size of the split AC unit you need depends primarily on the square footage of your renovated space. As a general rule of thumb, a 9,000 BTU unit covers up to 400 sq. ft., a 12,000 BTU unit covers up to 750 sq. ft., an 18,000 BTU unit covers up to 1,250 sq. ft., and a 24,000 BTU unit covers up to 1,500 sq. ft. To get an exact estimate of your heating and cooling needs, use our interactive split AC BTU calculator.
Conclusion
Selecting the right climate control system is key to fully enjoying your newly remodeled space. For the ultimate in energy savings and cold-weather performance, the **SEERXtreme FP10897US-WH+** is our top recommendation. If you prefer a modern aesthetic that blends with contemporary decor, the grey-finished **GreyVolt FP10791US-HS+** is an exceptional alternative. Ready to elevate your home's comfort? Explore Costway's full range of high-performance mini-split air conditioners today.