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DELLA 17000 BTU 20.3 SEER2 Concealed Ducted Mini Split Air Conditioner
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- Cooling Capacity: 17000
- Heating Capacity: 18000
- SEER2: 20.3
- Voltage: 208-230V
- Refrigerant Type: R454B
- Maximum Fuse Size: 20A
- Copper Line Length: None / 10ft / 16ft / 25ft / 33ft / 50ft
- Climate Range: -13°F - 131°F
Customize your setup
What size should I get?
- The correct line set size depends on your mini split system. Always refer to the manufacturer’s specifications to ensure compatibility.
- Measure the distance between your indoor and outdoor units
- When in doubt, choose a longer line set. Most systems require a minimum length of 15 feet to function correctly, while exceeding the manufacturer’s maximum limit can cause performance issues.
For more information, check out our complete guide to line sets for mini splits
Free & fast shipping
30-day money-back guarantee
Free lifetime coverage
1. Outdoor Unit
2. Indoor Unit
3. Refrigerant Pipe (10ft / 16ft / 25ft / 33ft/ 50ft models only)
4. Drain Hose
5. Insulation Foam
6. Wall Ssleeve
7. Cover Cap
8. Plastic Wrap
9. Plasticine Putty
10. Drainage Joint
11. Flexible Drain Hose
12. Thermostat
13. Hose Clamp
14. Rubber Foot Pad
15. Remote Control
16. Phillips Pan Head Bolt
17. Battery
18. Brass Nut Set
19. Communication Cable
20. Installation Template
Shipping Policy
How Long Will It Take for My Order to Ship?
It normally takes us 1 business day to arrange the shipment. During peak seasons, it will take 2-4 business days to arrange the shipment. We provide free ground shipping, so there are no additional charges for shipping and handling.
How Do I Track My Order?
Log into YOUR ACCOUNT, and you may see each individual order that you’ve placed with us. Select one that you want and you’ll be provided with all the details you need about the order.
Once your order is on the way you will receive a notification email.
What Should I Do If I Haven’t Received My Order?
Please contact us immediately.
For the full shipping policy, click here to view our shipping policy.
Return
We offer return guarantees to ensure your satisfaction with every DELLA purchase.
DELLA provides comprehensive assistance for all orders within 30 days of purchase. If you're not satisfied with your product within 30 days of purchase from dellahome.com, you can return the product for a full refund.Products must be returned in their original operating condition, including all accessories and packaging.The customer is responsible for return shipping costs.
If a product defect is confirmed, DELLA will, at its discretion, provide the necessary replacement parts free of charge. DELLA will also cover all shipping expenses for the delivery of replacement parts.
Need to Start a Return?
To initiate a return, call us at (800) 863-4143 or contact our live chat team.
For full return terms, click here to view our return policy.
Standard Warranty (1 Year): Products are covered by a 1-year limited warranty from the date of purchase.
Extended Warranty Program: Customers who register their mini split unit within 100 days of purchase will receive complimentary lifetime parts coverage.
Registered Product and Non-professional Install: If a product defect is confirmed, DELLA will, at its discretion, provide the necessary replacement parts free of charge. The customer is responsible for all shipping costs.
Registered Product and Professional Install: If a product defect is confirmed, DELLA will, at its discretion, provide the necessary replacement parts free of charge. If, after parts are replaced, the customer’s unit is still malfunctioning and the customer has a licensed HVAC tech's defective report, Della will take care of the customer at its discretion. In any event, the customer is responsible for all shipping costs.
Unregistered Product: If a product defect is confirmed, DELLA will, at its discretion, provide the necessary replacement parts. The customer is responsible for the costs of all parts and shipping.
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Tech specs
Indoor Unit Specs
Unit Dimensions (WxDxH):35.37"¡Á7.87"¡Á19.25"
Net/Gross Weight:39.68 / 47.4
Outdoor Unit Specs
Unit Dimensions (WxDxH):36.50" x 14.94" x 27.50"
Net/Gross Weight:90.4 / 105.8
System Specs
Cooling Capacity:17000
Heating Capacity:18000
SEER2:20.3
Voltage:208-230V
Refrigerant Type:R454B
Maximum Fuse Size:20A
Copper Line Length:None / 10ft / 16ft / 25ft / 33ft / 50ft
Climate Range:-13°F - 131°F
No.1 Selling Mini Split Brand on Amazon
Concealed Ducted: The Invisible Powerhouse
Experience the elite performance of our Optima series in a sleek, hidden form factor. Designed to be tucked away seamlessly inside the ceiling, our Concealed Ducted system provides high-performance climate control without disrupting your interior design.
Powered by Hyper Heat technology (down to -13°F) and boasting a stunning 19-20 SEER2 efficiency, it supports multi-duct delivery with flexible air outlets for customized airflow. With integrated fresh air intake support, it’s the professional-grade solution for both luxury homes and modern commercial spaces.
Powered by MightAir X
Top performance, energy smart design
45% more efficient energy savings
Cleaner air, healthier living
Durable design, lasting comfort
6 modes for max comfort
Auto mode
Maintain a comfortable indoor temperature by automatically switching between heating and cooling as needed
Auto mode
Maintain a comfortable indoor temperature by automatically switching between heating and cooling as needed

Wherever you are
Control your comfort, your way
Set schedules and timers through the Della+ app to match your daily routine.
Take control your way through the app, remote, or voice. Award-winning remote design makes every interaction seamless.
Your comfort adjusts automatically as you come and go.
Get help anytime with live chat or call, directly in the app.
Control your AC hands-free with Alexa.
Which series is right for me?
- Model
- Efficiency
- HSPF2 Rating (Region IV)
- Refrigerant
- Climate Range
- Energy Rebate
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Shop Now
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DELLA 17000 BTU 20.3 SEER2 Concealed Ducted Mini Split Air Conditioner
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SEER2 20.3
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10
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R454B
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-13°F - 131°F
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-
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DELLA 18,000 BTU 20.5 SEER2 Ceiling Cassette Ductless Mini Split AC - Up to 1000 Sq.Ft.
- SEER2 20.5
- 8.5
- R454B
- -13°F - 131°F
-
-
DELLA 18000 BTU 20.5 SEER2 Floor Mounted Mini Split AC - Up to 1000 Sq. Ft.
- SEER2 20.5
- 9.5
- R454B
- -13°F - 131°F
-
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DELLA Vario Series 18000 BTU 21 SEER2 Mini Split Heat Pump AC - Up to 1000 Sq.Ft.
- SEER2 21
- 9.5
- R454B
- -4°F - 122°F
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Frequently asked questions
DELLA supports the 2.4 GHz WiFi channel frequency band only.
The size of the mini split depends on the room's dimensions and specific needs. For example:
• A 350-square-foot room typically requires a 9500 BTU mini split.
• A 450-square-foot room needs 11000 BTUs.
• A 600-square-foot room needs 17000 BTUs.
We recommend professional HVAC installation for best results, but Della also offers a Rental Kit with the tools needed for vacuuming and installing your mini split.
Our mini split systems come with comprehensive standard coverage——register within 100 days for lifetime parts coverage; HVAC-licensed installs receive enhanced lifetime coverage, while non-licensed installs receive limited lifetime parts coverage.
Seasonally clean the reusable filters, inspect the condenser and evaporator units, and keep the area around the outdoor unit clear.

Talk to an HVAC expert
Not sure which system is right for your home? Our experts can help with sizing, installation, and product selection.
Technical support: Mon - Fri, 8 AM - 3 PM (PST)
24/7 live chat for general question
Customer Reviews
Shop accessories
DELLA Mini Split Line Set
- Material: Copper
- Color: White
- Nominal Wall Thickness: 0.375 inches
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Rebate available
Starting at $89.96
- Unit price
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DELLA Rental Install Kit
- Pump Type: Rotary Vane
- Motor Power: 1/3 hp (248W)
- Flow Rate: 4.5 cfm (7.6 m³/h)
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Rebate available
Starting at $300.00
- Unit price
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DELLA Mini Split Line Set Cover
- Material: PVC
- Temperature Tolerance: -40°F to 140°F
- Applicable Sizes: 7000 to 24000 BTU / 7000 to 36000 BTU
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Rebate available
Starting at $44.96
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DELLA Mini Split Line Set Cover with Flexible Duct
- Material: PVC
- Temperature Tolerance: -40°F to 140°F
- Applicable Sizes: 7000 to 24000 BTU / 7000 to 36000 BTU
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Rebate available
Starting at $48.96
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DELLA Wall Mounting Bracket for 6000-12000 BTU Single Zone Mini Split
- Material: Heavy-duty galvanized steel construction
- Dimensions: 17.72 L x 15.35 H
- Compatibility: 6000 to 12000 BTU ductless mini-splits
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Rebate available
$39.96
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DELLA Wall Mounting Bracket for 6000-36000 BTU Single Zone Mini Split
- Material: Heavy-duty galvanized steel construction
- Compatibility: 6000 to 36000 BTU ductless mini-splits
- Weight Capacity: Supports up to 485 lbs
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Rebate available
$59.96
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DELLA Ground Stand Bracket for 9000-18000 BTU Mini Split
- Material: Heavy-duty steel
- Compatibility: 9000 to 18000 BTU mini split units
- Weight Capacity: Supports up to 396 lbs
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Rebate available
$79.96
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DELLA Ground Stand Bracket for 9000-45000 BTU Mini Split
- Material: Heavy-duty steel
- Compatibility: 9000 to 45000 BTU mini split units
- Weight Capacity: Supports up to 440lbs
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Rebate available
$99.96
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