What kind of refrigerant does this unit use?

This unit uses R454B refrigerant. This unit comes pre-charged with R454B refrigerant for up to 24.5 feet of lineset. If your installation does not exceed this length, no additional refrigerant is needed.

What is the difference between R454B and R410A?

R454B is a new-generation eco-friendly refrigerant that complies with EPA regulations. It can replace the original R410A models, offering better performance and greater energy efficiency.

Can I get longer extensions for this installation kit?

Yes, you can purchase a longer lineset separately. If you buy it together with the Single Zone Mini split system, you’ll receive a 10% bundle discount. Please note, if the extended lineset is longer than 25 feet, additional refrigerant will be required. Make sure to consult a professional HVAC technician for proper installation.

When the unit is in auto mode, what will the room's temperature be maintained at?

In auto mode, the unit automatically switches between cooling and heating to maintain the set temperature. You can adjust the target temperature manually—typically between 60°F and 86°F —depending on your comfort.

Do the condenser lines come pre-vacuumed or do they have to be vacuumed?

The mini split condenser and lines are not pre-vacuumed. You will need to vacuum the system during installation to remove air and moisture before releasing the refrigerant—this is essential for proper operation and longevity. You can use our Rental Kit Service, which includes all the necessary tools for vacuuming and installing your mini split.

DELLA Optima Pro Series 18000 BTU 23.5 SEER2 Ultra Hyper Heat Mini-Split AC - Up to 1000 Sq.Ft.

SKU: TPH-18K2V-23S-I+O

$1,849.96

Unit price: per

Enjoy 12% off automatically at checkout.

Cooling Capacity: 18000
Heating Capacity: 18000
SEER2: 23.5
Fitting Area: 1000
Voltage: 208-230v
Refrigerant Type: R454B
Maximum Fuse Size: 30A
Copper Line Length: 16.4ft
Copper Line Size: 1/2 inch and 1/4 inch
Climate Range: -22°F - 131°F

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Voltage

DELLA Optima Pro Series 18000 BTU 23.5 SEER2 Ultra Hyper Heat Mini-Split AC - Up to 1000 Sq.Ft.

Voltage: 230V

Free & fast shipping

30-day money-back guarantee

Free lifetime coverage

Download Remote Control Manual (New Black) (PDF)

AHRI Certificate

Description

Engineered for larger living spaces, the Optima Pro Series 18000 BTU mini split delivers steady comfort across areas up to 1000 sq. ft. This Energy Star system reaches a 23.5 SEER2 efficiency rating and qualify for rebate programs. Its ultra-hyper-heat pump provides reliable heating in temperatures as low as –22°F, with WiFi and Alexa control for easy adjustments from anywhere. The indoor unit operates quietly at 34 dB(A), and the system includes a full installation kit and lifetime warranty support.

What’s included

1. Indoor Unit
2. Outdoor Unit
3. Refrigerant Pipe
4. Drain Lines
5. Remote Control
6. 2 AAA Batteries
7. Screws
8. Anchors
9. Mounting Plate
10. Insulation Foam
11. Wall Sleeve
12. Rubber Feet
13. Plasticine Putty
14. Drain Elbow
15. Wall cap
16. Plastic Wrap
17. Communication Cable
18. Bracket Template

Shipping & returns

Warranty

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Tech specs

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Indoor Unit Specs

Unit Dimensions (WxDxH):43.19"¡Á8.75"¡Á13.06"

Net/Gross Weight:30.86 / 39.7

Outdoor Unit Specs

Unit Dimensions (WxDxH):36.50"×14.94"×27.50"

Net/Gross Weight:93.7 / 110

System Specs

Cooling Capacity:18000

Heating Capacity:18000

SEER2:23.5

Fitting Area:1000

Voltage:208-230v

Refrigerant Type:R454B

Maximum Fuse Size:30A

Copper Line Length:16.4ft

Copper Line Size:1/2 inch and 1/4 inch

Climate Range:-22°F - 131°F

No.1 Selling Mini Split Brand on Amazon

Optima Pro: Engineered for the Absolute Extreme.

When the temperature drops, most heat pumps give up. The Optima Pro steps up. Featuring our most advanced Ultra Hyper Heat technology, it delivers relentless warmth down to -22°F.

While others lose power in the cold, the Pro maintains 100% heating capacity at 5°F with zero performance degradation. Now boasting an elite 25 SEER2 rating and ENERGY STAR® certification, it’s not just a heater—it’s an ironclad guarantee of year-round comfort and maximum energy savings for the harshest environments.

Top performance, energy smart design

68% more efficient energy savings

Cleaner air, healthier living

Durable design, lasting comfort

Reliable Comfort in Extreme Cold

Designed to maintain dependable heating performance in severe winter conditions while delivering reliable cooling through intense summer heat.

6 modes for max comfort

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.

Which series is right for me?

Model
Efficiency
HSPF2 Rating (Region IV)
Refrigerant
Climate Range
Energy Rebate
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- SEER2 23.5
- 10
- R454B
- -22°F - 131°F
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- 9.5
- R454B
- -4°F - 122°F
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- SEER2 17
- 8.5
- R32
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- DELLA Serena CloudAir Series 18000 BTU 22 SEER2 Mini Split Heat Pump AC - Up to 1000 Sq.Ft.
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- 9.5
- R32
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Customer Reviews

Overall rating: 5.0 / 5 from 2 reviews.

Customer video review of DELLA Optima Pro Series 18000 BTU 23.5 SEER2 Ultra Hyper Heat Mini-Split AC - Up to 1000 Sq.Ft.

This was the third Della that I’ve installed at our house. The first one looked like I installed it the second looked much better but this one looks even better. I sent videos to marketing @della for you to see. With this one I’ve noticed certain design changes that make it easier to assemble.

Jerry L. 5/5 Verified August 20, 2026