Della 18K BTU 2-Zone Cassette Alternatives: 6 Similar Picks Compared
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You are looking for della 18k btu 2 zone cassette alternatives because this specific model targets quiet commercial ceiling installations with 24 SEER2 efficiency. It delivers 18,000 BTU across two zones with a low 32 dB(A) noise level and 360° airflow. These specs suit users who prioritize smart features and low noise over raw power in smaller spaces.
You might want something else if you need higher total capacity, unequal room sizes, or a different installation type. Some buyers prefer wall-mounted units for DIY projects, while others need more cooling power for larger areas. The 6 picks below were chosen because their specs overlap with the original product. Each option shares key attributes like dual-zone capability or similar efficiency ratings, allowing you to compare practical differences in size, voltage, and airflow design.
Our top pick: DELLA 18K BTU 2-Zone Cassette.
How these alternatives differ
TOSOT 36K BTU 2-Zone Mini Split
The TOSOT 36K BTU 2-Zone model doubles the total cooling capacity to 36,000 BTU, splitting it into 12,000 and 24,000 BTU zones. This setup suits spaces with unequal sizes, unlike the Della 18K which splits capacity evenly at 9,000 BTU per zone. While the TOSOT has a lower 21 SEER2 rating compared to the Della’s 24 SEER2, it offers more raw power for larger areas. The indoor units are also larger, measuring 16.8 by 32.5 inches, which may require more ceiling space. You should choose this if you need higher output for one specific room rather than balanced comfort for two equal zones.
Della 28K BTU Dual Zone Mini Split
The Della 28K BTU Dual Zone unit provides a higher total capacity of 28,000 BTU, divided equally into two 18,000 BTU zones. This is significantly more powerful than the 18K model’s 9,000 BTU per zone. However, it drops to a 20 SEER2 efficiency rating, meaning higher energy usage than the original’s 24 SEER2. A key practical difference is that this model includes the line set, whereas the Della 18K cassette often requires separate purchase. It is a better fit if you need more cooling power for larger rooms and want included hardware, but you will sacrifice some energy efficiency.
TOSOT 36K BTU 2-Zone Mini Split
This TOSOT 36K BTU 2-Zone unit mirrors the first TOSOT alternative with a 12,000 plus 24,000 BTU split. It targets users needing high capacity for unequal room sizes. Like the other TOSOT, it has a 21 SEER2 rating, which is lower than the Della 18K’s 24 SEER2. The physical dimensions are identical to the other TOSOT model, making it a substantial ceiling unit. It is designed for extreme weather resilience and smart features. If you prioritize raw cooling power for a large, unevenly heated space over peak efficiency, this high-capacity option is a strong alternative to the balanced Della cassette.
DELLA 27,000 BTU 2-Zone Ceiling Cassette
The Della 27,000 BTU 2-Zone Ceiling Cassette is the closest sibling, maintaining the same 22.5 by 9.63 inch form factor as the original. It splits capacity into two 18,000 BTU zones, doubling the per-zone output of the 18K model. This makes it ideal for larger commercial spaces where the original might struggle. It includes the line set, which the original often does not. While specific efficiency ratings are not listed in the provided data, the increased capacity means higher power draw. Choose this if you need the same professional cassette look but require twice the cooling power per zone.
COSTWAY 36k Dual Zone 23 SEER2
The COSTWAY 36k Dual Zone unit offers a 23 SEER2 rating, which is higher than the TOSOT alternatives but slightly lower than the Della 18K’s 24 SEER2. It provides a 7,000 plus 12,000 BTU split, focusing on one small and one medium zone. It operates on 230V, matching the Della’s voltage range, and includes Wi-Fi smart control. The indoor units are larger and wall-mounted style, differing from the ceiling cassette design. This pick suits users who want higher efficiency than the other TOSOTs and have specific wiring constraints, but it lacks the ceiling-mounted aesthetic of the original.
Klimaire 18k DIY 2-Zone 24 SEER2
The Klimaire 18k DIY 2-Zone model matches the total 18,000 BTU capacity of the original, split evenly into two 9,000 BTU zones. It also features a 24 SEER2 rating, offering identical efficiency. The main difference is its DIY orientation and wall-mounted indoor units, which are much larger than the compact cassette design. The Klimaire units measure 36.5 inches wide, making them less discreet than the Della’s ceiling unit. It is a practical choice for homeowners who prefer wall installation and want to avoid professional installation costs, but it does not offer the sleek, hidden ceiling look of the original cassette.
Quick picks
Our 7 picks
DELLA 18K BTU 2-Zone Cassette
Best for: quiet commercial ceiling installations
- Cooling Capacity
- 18,000 BTU
- Efficiency Rating
- 24 SEER2
- Voltage
- 208-230V
- Coverage Area
- Up to 800 sq ft
- Number of Zones
- 2 Zone
- Heat Pump
- Heat Pump
View on Amazon: DELLA 18K BTU 2-Zone Cassette Affiliate link
This Della ceiling cassette mini split offers 18,000 BTU of cooling across two zones. It features a 24 SEER2 efficiency rating and operates at just 32 dB(A). The system includes a refrigerant leak sensor and supports the Della App for remote control. It fits spaces up to 800 square feet. You get independent temperature control for each zone. The unit requires professional installation and is not a DIY project.
Pros
- 24 SEER2 efficiency rating for strong performance
- Quiet operation at 32 dB(A)
- Includes refrigerant leak sensor for safety
- Smart control via Della App and voice assistants
Cons
- Requires professional installation, not DIY friendly
- Lower total cooling capacity than 36K alternatives
- Indoor unit dimensions are 22.5 inches square
Good fit if
- You need quiet cooling for offices or shops
- You want smart app control for each zone
- You have a ceiling space for cassette units
Skip if
- You prefer a DIY installation process
- You need more than 18,000 BTU total
- You want a wall-mounted unit instead
Verdict: DELLA 18K 2-Zone Cassette AC provides efficient, quiet cooling for smaller commercial spaces. It suits users who prioritize smart features and low noise over raw power.
TOSOT 36K BTU 2-Zone Mini Split
Best for: Unequal room cooling needs
- Cooling Capacity
- 36,000 BTU
- Efficiency Rating
- 21 SEER2
- Voltage
- 230V
- Number of Zones
- 2 Zone
- Heat Pump
- Heat Pump
- Smart Connectivity
- WiFi, Gree+ app, Alexa, Google Home
View on Amazon: TOSOT 36K BTU 2-Zone Mini Split Affiliate link
This dual-zone heat pump uses a 36,000 BTU outdoor unit to power two indoor handlers: one 12,000 BTU and one 24,000 BTU. It earns 21 SEER2 efficiency and supports temperatures down to -22 °F. You get smart control via the Gree+ app and voice assistants. It requires professional installation and includes a 16 ft line set.
Pros
- Asymmetric zone split (12K+24K) for varied room sizes
- 21 SEER2 energy efficiency rating
- Operates in extreme heat (118 °F) and cold (-22 °F)
- Smart app and voice control compatibility
Cons
- Heavier 299 lb outdoor unit
- Requires professional HVAC installation
- Lower SEER2 than some 18K competitors
Good fit if
- You need different capacities for each room
- You want smart app scheduling
- You live in extreme climates
Skip if
- You prefer DIY installation
- You need identical room outputs
- You want higher SEER2 ratings
Verdict: TOSOT 36K BTU 2-Zone Mini Split suits homes needing unequal cooling power per room. It offers solid efficiency and smart features for professional setups.
Della 28K BTU Dual Zone Mini Split
Best for: Dual-zone cooling with included line sets
- Cooling Capacity
- 28,000 BTU
- Efficiency Rating
- 20 SEER2
- Voltage
- 208-230V
- Coverage Area
- Up to 2,000 sq ft
- Number of Zones
- Dual Zone
- Heat Pump
- Heat Pump
View on Amazon: Della 28K BTU Dual Zone Mini Split Affiliate link
This Della dual-zone system pairs two 18,000 BTU indoor units with a single outdoor condenser for a total cooling capacity of 28,000 BTU. It offers 20 SEER2 efficiency and operates quietly at 32 dBa. The unit covers up to 2,000 square feet and includes 16-foot installation kits. You get separate controllers for each room, allowing independent temperature settings. It uses R454B refrigerant and functions as a heat pump down to -13°F.
Pros
- 28,000 BTU total cooling capacity across two zones
- 20 SEER2 energy efficiency rating
- Ultra-quiet operation at 32 dBa
- Includes 16-foot line sets and installation kits
- Independent controllers for each indoor unit
Cons
- Lower 20 SEER2 efficiency compared to competitors reaching 24 SEER2
- No self-cleaning function despite display option
- Requires professional installation and line-set vacuuming
Good fit if
- You need separate climate control for two large rooms
- You prefer a budget-friendly option with included line sets
- You want quiet operation in living spaces
Skip if
- You require the highest possible energy efficiency ratings
- You prefer a DIY-friendly installation without vacuuming
- You need self-cleaning maintenance features
Verdict: Della 28K BTU 2-Zone Mini Split is a practical choice for homeowners who need dual-zone cooling with included hardware. It suits those prioritizing quiet operation and independent room control over top-tier efficiency ratings.
TOSOT 36K BTU 2-Zone Mini Split
Best for: Unequal room sizes needing high total capacity
- Cooling Capacity
- 36,000 BTU
- Efficiency Rating
- 21 SEER2
- Voltage
- 230V
- Number of Zones
- 2 Zone
- Heat Pump
- Heat Pump
- Smart Connectivity
- WiFi, Gree+ app, voice control
View on Amazon: TOSOT 36K BTU 2-Zone Mini Split Affiliate link
This TOSOT Cosmo system pairs a 12,000 BTU unit with a 24,000 BTU unit for a total of 36,000 BTU. It offers 21 SEER2 efficiency and operates in temperatures from -22℉ to 118℉. You control it via the Gree+ app or voice commands. It suits larger spaces needing distinct climate zones. The system includes a 16.4-foot pipe set but requires a separate power cord.
Pros
- 36,000 BTU total cooling capacity with 12K and 24K indoor units
- 21 SEER2 energy efficiency rating
- Operates in ambient temperatures from -22℉ to 118℉
- Smart control via Gree+ app and voice commands
- Five-year warranty coverage
Cons
- Lower 21 SEER2 rating compared to competitors reaching 24 SEER2
- Does not include the necessary power cord
- 12,000 BTU indoor unit is smaller than the 18,000 BTU units found in other picks
Good fit if
- You need high capacity for two large, distinct rooms
- You want smart app control and voice assistance
- You live in an area with extreme temperature swings
Skip if
- You require the highest possible energy efficiency rating
- You prefer indoor units with equal BTU outputs
- You want a complete kit with the power cord included
Verdict: TOSOT Cosmo 36K BTU 2-Zone Mini Split is a high-capacity option for users needing unequal room sizes. It fits buyers who prioritize extreme weather resilience and smart features over peak efficiency numbers.
DELLA 27,000 BTU 2-Zone Ceiling Cassette
Best for: Commercial spaces needing two-zone comfort
- Cooling Capacity
- 27,000 BTU
- Efficiency Rating
- 24 SEER2
- Voltage
- 208-230V
- Coverage Area
- Up to 2000 sq ft
- Number of Zones
- 2 Zone
- Heat Pump
- Heat Pump
View on Amazon: DELLA 27,000 BTU 2-Zone Ceiling Cassette Affiliate link
This Della unit delivers 27,000 BTU of cooling across two zones, each rated for 1,000 square feet. It achieves a 24 SEER2 efficiency rating and operates as a heat pump down to -13°F. The indoor cassettes feature 360-degree airflow and run at 37 dB. You get independent controllers for each room, making it suitable for commercial spaces or large residential areas needing balanced comfort.
Pros
- 24 SEER2 efficiency rating for strong performance
- 360-degree surround airflow for even distribution
- Operates as a heat pump down to -13°F
- Quiet operation at 37 dB(A)
Cons
- Mandates professional installation, not DIY friendly
- Total indoor capacity exceeds outdoor output
- Requires 208-230 V power supply
Good fit if
- You need independent temperature control for two large rooms
- You want a quiet, ceiling-mounted commercial solution
- You require heat pump operation in cold climates
Skip if
- You prefer a DIY installation process
- You only have standard 115 V outlets
- You need a single-zone setup
Verdict: DELLA 27,000 BTU 2-Zone Cassette fits users who need professional-grade, quiet cooling for two distinct large zones. It is ideal for commercial spaces or open homes where independent climate control is necessary.
COSTWAY 36k Dual Zone 23 SEER2
Best for: High-capacity 230V dual-zone cooling
- Cooling Capacity
- 36000 BTU
- Efficiency Rating
- 23 SEER2
- Voltage
- 208-230V
- Number of Zones
- 2 Zone
- Heat Pump
- Heat Pump
- Smart Control
- Wi-Fi
View on Amazon: COSTWAY 36k Dual Zone 23 SEER2 Affiliate link
This 36,000 BTU dual-zone mini split operates on 230V power with a 23 SEER2 efficiency rating. It pairs a 7,000 BTU indoor unit with a 12,000 BTU unit for flexible room cooling. The system includes Wi-Fi control, a 24-hour timer, and R32 refrigerant. It suits spaces needing high capacity and dedicated 230V circuits. You get independent temperature control for two distinct areas.
Pros
- 23 SEER2 energy efficiency rating
- 208-230V voltage compatibility
- Wi-Fi smart control capability
- R32 low-GWP refrigerant
- Independent zone temperature adjustment
Cons
- Requires professional HVAC installation
- Limited to two specific zone configurations
- Asymmetrical 7k plus 12k BTU split
Good fit if
- You have a dedicated 230V electrical circuit
- You need high cooling capacity for large rooms
- You want Wi-Fi remote management
Skip if
- You only have standard 115V outlets
- You prefer symmetrical zone outputs
- You need a DIY-friendly setup
Verdict: COSTWAY 36k 2-Zone 230V Mini Split offers strong efficiency and smart features for users with 230V wiring. It fits buyers needing powerful, zoned cooling with app control.
Klimaire 18k DIY 2-Zone 24 SEER2
Best for: DIYers needing efficient 2-zone cooling for smaller rooms
- Cooling Capacity
- 18000 BTU
- Efficiency Rating
- 24 SEER2
- Coverage Area
- Up to 350 sq ft per unit
- Number of Zones
- 2 Zone
- Heat Pump
- Heat Pump
- Smart Connectivity
- Wi-Fi, Alexa, Google Assistant
View on Amazon: Klimaire 18k DIY 2-Zone 24 SEER2 Affiliate link
This Klimaire unit splits 18,000 BTU into two 9,000 BTU zones with 24 SEER2 efficiency. It uses R-454B refrigerant and E-Z Fast Connect fittings for DIY installation without vacuum pumps. Smart WiFi control works with Alexa and Google Assistant. It cools down to 131°F outdoor temps and heats down to -13°F. Each indoor unit covers up to 350 sq. ft. with self-cleaning and multi-stage filtration.
Pros
- 24 SEER2 efficiency rating for energy savings
- DIY-friendly E-Z Fast Connect fittings
- Smart WiFi with Alexa and Google Assistant
- Heating performance down to -13°F
Cons
- Lower 9,000 BTU per zone limits large room coverage
- No dedicated physical display mentioned in data
- Requires DIY installation skills
Good fit if
- You want high SEER2 efficiency in a 2-zone setup
- You prefer DIY installation with fast-connect fittings
- You need smart voice control via Alexa or Google
Skip if
- You need higher than 9,000 BTU per zone
- You require professional HVAC installation only
- You want a single large-capacity unit
Verdict: Klimaire DIY 18K BTU 2-Zone 24 SEER2 suits DIYers needing efficient, smart-controlled cooling for two smaller rooms. It is less ideal for large spaces requiring higher per-zone capacity.
Specifications side by side
| Spec | DELLA 18K BTU 2-Zone Cassette | TOSOT 36K BTU 2-Zone Mini Split | Della 28K BTU Dual Zone Mini Split | TOSOT 36K BTU 2-Zone Mini Split | DELLA 27,000 BTU 2-Zone Ceiling Cassette | COSTWAY 36k Dual Zone 23 SEER2 | Klimaire 18k DIY 2-Zone 24 SEER2 |
|---|---|---|---|---|---|---|---|
| Cooling Capacity | 18,000 BTU | 36,000 BTU | 28,000 BTU | 36,000 BTU | 27,000 BTU | 36000 BTU | 18000 BTU |
| Efficiency Rating | 24 SEER2 | 21 SEER2 | 20 SEER2 | 21 SEER2 | 24 SEER2 | 23 SEER2 | 24 SEER2 |
| Voltage | 208-230V | 230V | 208-230V | 230V | 208-230V | 208-230V | not stated |
| Coverage Area | Up to 800 sq ft | not stated | Up to 2,000 sq ft | not stated | Up to 2000 sq ft | not stated | Up to 350 sq ft per unit |
| Number of Zones | 2 Zone | 2 Zone | Dual Zone | 2 Zone | 2 Zone | 2 Zone | 2 Zone |
| Heat Pump | Heat Pump | Heat Pump | Heat Pump | Heat Pump | Heat Pump | Heat Pump | Heat Pump |
| Smart Connectivity | App, Voice Assistant | WiFi, Gree+ app, Alexa, Google Home | Wi-Fi, Alexa | WiFi, Gree+ app, voice control | not stated | not stated | Wi-Fi, Alexa, Google Assistant |
| Mounting Type | not stated | not stated | Wall Mount | not stated | not stated | not stated | Wall Mount |
| Smart Control | not stated | Wi-Fi | Wi-Fi, Alexa | Wi-Fi | not stated | Wi-Fi | not stated |
| Dimensions | 22.5 × 22.5 × 9.63 inches | 40.2 × 16.8 × 32.5 inches | 8.69 × 39.8 × 12.4 inches | 40.2 × 16.8 × 32.5 inches | 22.5 × 22.5 × 9.63 inches | 17.9 × 41.2 × 31.8 inches | 14.9 × 36.5 × 27.5 inches |
| Weight | 32 pounds | 299 pounds | 27.6 pounds | not stated | 32 pounds | not stated | 92.6 pounds |
| Size | 2 Zone 18000 BTU 9+9 | 36,000 BTU(2) 12+24 | 2 Zone 28000 BTU 18+18 | 36,000 BTU(Dual)12+24 | 2 Zone 27000 BTU 18+18 | Dual Zone 7000 BTU+12000 BTU | 9,000 BTU + 9,000 BTU |
| Color | White without Line set | White | White with Line set | White | White with Line set | White | White |
| Model | 1D2-CC+D99-X | TST-MZ-C36-D1224 | 1D3-TL+D1818 | 811820027012 | 1D3-CC+D1818 | B0F91K6LDN | KMIP218 + 2xKIWP09H2 |
If you need lower capacity for a single room, review della 10000 btu energy saving alternatives instead.
Frequently asked questions
Which alternative offers the highest SEER2 rating?
The Klimaire 18K DIY 2-Zone model leads with a 24 SEER2 efficiency rating. This matches the original Della cassette’s efficiency while providing 9,000 BTU per zone. The COSTWAY 36k also offers strong performance at 23 SEER2. Other models like the TOSOT and Della 28K sit at 21 SEER2 and 20 SEER2 respectively. Higher SEER2 numbers indicate lower energy consumption during cooling cycles.
Can I find a 230V option for these dual-zone systems?
Yes, the COSTWAY 36k Dual Zone is explicitly rated for 230V power. This is distinct from standard 115V residential units. Most other listed alternatives, including the Della and TOSOT models, do not specify this voltage in their data. You should verify your home’s electrical supply before choosing the COSTWAY model for high-capacity 230V dual-zone cooling.
Which model provides unequal cooling capacity for different room sizes?
The TOSOT 36K BTU 2-Zone Mini Split offers unequal capacity, splitting power into 12,000 and 24,000 BTU zones. This suits spaces where one room requires significantly more cooling than the other. In contrast, the Della 18K and Della 28K models split their total capacity evenly at 9,000 BTU or 18,000 BTU per zone.
Do any alternatives include the line set with the unit?
The Della 28K BTU Dual Zone and the DELLA 27,000 BTU 2-Zone Cassette both come with the line set included. The original Della 18K 2-Zone Cassette is listed as without the line set. Other brands like TOSOT and COSTWAY do not specify line set inclusion in their provided data. Check the packaging details carefully if you need pre-connected tubing.
What is the physical size of the outdoor condenser units?
The TOSOT 36K BTU 2-Zone models have large outdoor units measuring 40.2 inches in length and 32.5 inches in height. The COSTWAY 36k is also substantial at 41.2 inches long. The Della cassette indoor units are compact, measuring 22.5 inches square. Always measure your installation space to ensure the outdoor condenser fits your designated area.
Are there smart Wi-Fi control options available?
The COSTWAY 36k Dual Zone explicitly lists Wi-Fi smart control in its attributes. This allows remote management via an app. The Della 18K 2-Zone Cassette is described as prioritizing smart features, though specific connectivity is not detailed in the specs. You should confirm app compatibility with the manufacturer if remote control is a priority for your setup.
Which system is best for DIY installation in smaller rooms?
The Klimaire 18K DIY 2-Zone is designed for DIYers needing efficient cooling for smaller rooms. It provides 9,000 BTU per zone, totaling 18,000 BTU. This matches the capacity of the original Della cassette but in a standard split format. It is less ideal for large spaces requiring higher per-zone capacity, making it perfect for smaller, individual rooms.