Della 34K BTU 2 Zone Review (2026): A Spec-Based Look

What stands out

• High efficiency with a 20 SEER2 rating and 8.5 HSPF for stable inverter performance.
• Concealed ducted design with 0.4 in. WC static pressure for complex ductwork layouts.
• Quiet operation at 28 dB, suitable for bedrooms and offices.
• Smart control via DELLA App and Alexa with geolocation start functionality.
• Includes a built-in condensate pump and R454B eco-friendly refrigerant.

Who it fits

Key specs explained

Cooling Capacity: 34,000 BTU

This rating indicates the total cooling power the system provides across both zones. You get 9,000 BTU for one room and 24,000 BTU for another. This setup handles up to 1,150 square feet of space. Larger units suit bigger open areas or multiple rooms. Smaller units work for single rooms. Check this number to ensure the system matches your home's size needs without wasting energy.

Efficiency Rating: 20 SEER2

SEER2 measures seasonal energy efficiency. A 20 rating means the unit uses less electricity to produce the same cooling as lower-rated models. This helps keep your utility bills lower over time. Higher numbers indicate better efficiency. Compare this value with other mini splits to find the most cost-effective option for your long-term energy savings and environmental impact.

Number of Zones: 2 Zone

This system controls two separate areas independently. You can set different temperatures for the 9,000 BTU unit and the 24,000 BTU unit. This flexibility suits homes with varying heat loads in different rooms. You avoid cooling empty spaces. Single-zone units only control one area. Multi-zone systems like this offer better comfort for multi-room households with distinct climate needs.

Smart Connectivity: DELLA App, Alexa

You can control the unit remotely via the Della app or voice commands through Alexa. This allows you to adjust settings from your phone or hands-free. You can schedule operations or change temperatures before arriving home. This convenience adds modern control to your HVAC system. Check if your preferred smart home platform is supported for seamless integration into your daily routine.

Design and Build Overview

The indoor units are concealed ducted air handlers designed for installation in ceilings or attics. This layout keeps the hardware hidden for a clean, seamless look. The listing states the units measure 27.5 inches in width, 19.3 inches in length, and 7.87 inches in height. Each unit weighs 33.1 pounds. The finish is white, which blends into standard interior spaces. The design supports up to 0.4 inches of water column static pressure, allowing for complex ductwork and multi-story airflow distribution. Two return air positions provide flexibility for various installation layouts.

You control the system through the Della App, Alexa, a included thermostat, and a remote. The app and Alexa support enable remote temperature adjustments and geolocation features that start the system before you arrive. The units operate quietly, with noise levels as low as 28 decibels, ensuring even airflow without disruption. The concealed design hides the mechanical components, reducing visual clutter in homes or small commercial spaces.

According to the listing, the system includes two 25-foot copper line sets with specific diameters for the 9,000 BTU and 24,000 BTU handlers. The units use eco-friendly R454B refrigerant and feature a built-in condensate pump for reliable long-term operation. Professional installation is required, as this is not a DIY system. The design prioritizes efficient space usage and quiet performance for areas where aesthetics matter.

Setup And Everyday Use

This system requires professional installation. It is not a DIY project. You must connect the indoor units to concealed ductwork in ceilings or attics. The listing includes two 25-foot copper line sets. If your line sets exceed 25 feet, you must adjust the refrigerant charge. The unit operates on 208-230V power. You need a circuit with a maximum fuse rating of 35A. The design includes two return air positions, which helps you adapt the layout to your home’s structure. A built-in condensate pump manages water removal for reliable long-term operation. The system uses R454B refrigerant, which is eco-friendly.

For daily use, you control the temperature via the included thermostat, remote, or the DELLA App. The app supports Alexa integration for voice commands. You can set temperatures between 60°F and 90°F. The fan offers seven speeds to adjust airflow quickly. The system also features smart defrost and high-temperature self-cleaning modes. You can use geolocation to start the unit before you arrive home. The inverter technology adjusts compressor speed automatically. This provides stable performance and may reduce power usage by up to 40%. The unit operates quietly, starting at 28 dB. It maintains comfortable airflow even in complex multi-story layouts with 0.4 in. WC static pressure.

Before You Buy This Unit

You need to verify your electrical panel can handle the 35-amp maximum fuse rating for this 208-230V system. The unit uses R454B refrigerant, which is eco-friendly but may require specific handling during service. Since the system includes a built-in condensate pump, you should confirm your installation location allows for proper drainage and pump operation. You will also need to check if your existing ductwork can support the 0.4-inch water column static pressure, as this system is designed for complex layouts. The Della app and Alexa compatibility mean you should ensure your Wi-Fi network is stable in the attic or ceiling space where the units are hidden. This model sits alongside other multi-zone options by offering high efficiency and smart features, but its concealed design demands more planning than wall-mounted units. You must also consider the professional installation requirement, as this is not a DIY project. Proper setup ensures the 7-speed fan and inverter technology work efficiently.

Check before you buy

• Confirm your electrical panel supports 35-amp fuses for 208-230V operation.
• Check that your ductwork handles 0.4-inch WC static pressure.
• Ensure Wi-Fi reaches the attic or ceiling installation spots.
• Verify professional installer is available for non-DIY setup.

The product at a glance

1

Della 34K BTU Dual Zone Concealed Ducted

Best for: multi-zone concealed ducted installations

Cooling Capacity

34,000 BTU

Efficiency Rating

20 SEER2

Voltage

208-230V

Coverage Area

Up to 1150 Sq. Ft

Number of Zones

2 Zone

Heat Pump

Heat Pump

View on Amazon: Della 34K BTU Dual Zone Concealed Ducted Affiliate link

This concealed ducted mini split delivers 34,000 BTU across two zones, pairing a 9,000 BTU unit with a 24,000 BTU unit. It offers 20 SEER2 efficiency and operates down to -13°F. The system includes a built-in condensate pump and supports up to 1,150 square feet of coverage. You get smart control via the app and Alexa, along with a thermostat and remote for precise temperature management.

Pros

• 20 SEER2 efficiency rating for energy savings
• Built-in condensate pump for flexible installation
• Smart control via DELLA App and Alexa
• Quiet operation starting at 28 dB

Cons

• Requires professional installation; not a DIY system
• Refrigerant adjustment needed for line sets over 25 ft
• Maximum fuse rating of 35A limits electrical flexibility

Good fit if

• You need concealed units for a clean ceiling look
• You want smart control through Alexa or the app
• You require heating performance down to -13°F

Skip if

• You prefer a simple DIY installation without professional help
• You need a single-zone system for one room
• You cannot accommodate a 35A maximum fuse rating

Verdict: Della 34K BTU 2-Zone Ducted Mini Split suits homeowners seeking a high-efficiency, concealed cooling solution with smart features. It is ideal for those willing to hire a professional installer for complex ductwork and multi-zone temperature control.

Specifications side by side

Frequently asked questions

See also

• della 34k btu 2 zone alternatives
• best della mini splits under 2500
• della 18k btu 2 zone review
• della 8000 btu smart window review