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 Vario Series 24000 BTU 21 SEER2 Mini Split Heat Pump AC - Up to 1500 Sq.Ft.

SKU: TL-24K2VB-21S-I+O

$1,499.96

Unit price: per

Cooling Capacity: 24000
Heating Capacity: 24600
SEER2: 21
Fitting Area: 1500
Voltage: 208-230V
Refrigerant Type: R454B
Maximum Fuse Size: 25A
Copper Line Length: 16.4ft
Copper Line Size: 1/2 inch and 1/4 inch
Climate Range: -4°F - 122°F

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Voltage

DELLA Vario Series 24000 BTU 21 SEER2 Mini Split Heat Pump AC - Up to 1500 Sq.Ft.

Voltage: 230V

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30-day money-back guarantee

Free lifetime coverage

Download Remote Control Manual (New Black) (PDF)

AHRI Certificate

Description

Take command of your largest spaces with the Vario Series 24000 BTU system, the definitive climate solution for areas up to 1500 sq. ft. This powerful air conditioner with heat pump delivers substantial cooling and heating capacity while maintaining an exceptional 21 SEER2 efficiency rating, ensuring comfort without compromise. Engineered for four-season performance down to -4°F, it utilizes smart sensor technology for personalized comfort and operates at a quiet 36 dBa—remarkable for its high output.

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

Download User Manual

Indoor Unit Specs

Unit Dimensions (WxDxH):46.94" x 10.25" x 14.19"

Net/Gross Weight:36.4 / 43

Outdoor Unit Specs

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

Net/Gross Weight:88.2 / 103.6

System Specs

Cooling Capacity:24000

Heating Capacity:24600

SEER2:21

Fitting Area:1500

Voltage:208-230V

Refrigerant Type:R454B

Maximum Fuse Size:25A

Copper Line Length:16.4ft

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

Climate Range:-4°F - 122°F

No.1 Selling Mini Split Brand on Amazon

Vario Series: High Efficiency. Higher Value.

The Vario Series is the ultimate all-rounder for the modern homeowner. Boasting an impressive SEER2 19 rating, it’s engineered to keep your energy bills low without compromising on power.

Designed to perform in a wide range of climates, the Vario provides reliable heating down to -4°F, making it the perfect fit for the majority of U.S. cities. High-end efficiency meets a price that makes sense—Vario is the smart, sustainable choice for year-round comfort.

Top performance, energy smart design

50% more efficient energy savings

Cleaner air, healthier living

Durable design, lasting comfort

Comfort for Hot Summers and Colder Winters

Built to deliver dependable heating and cooling across a wide range of outdoor temperatures for year-round comfort.

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 21
- 9.5
- R454B
- -4°F - 122°F
- DELLA Optima Pro Series 24000 BTU 22.5 SEER2 Ultra Hyper Heat Mini-Split AC - Up to 1500 Sq.Ft.
- SEER2 22.5
- 10
- R454B
- -22°F - 131°F
- Shop Now
- DELLA Econo Series 23000 BTU 17 SEER2 Mini Split Heat Pump AC - Up to 1500 Sq.Ft.
- SEER2 17
- 9.5
- R32
- 5°F - 122°F
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- 10
- R32
- 5°F - 125°F
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Customer Reviews

Overall rating: 5.0 / 5 from 12 reviews.

Customer photo review of DELLA Vario Series 24000 BTU 21 SEER2 Mini-Split Heat Pump AC - Up to 1500 Sq.Ft.

Works flawless for shop and easy install! App works good

Jeremy L. 5/5 Verified September 1, 2025

We have great feed back from all of our Della Unit installs!

Timothy R. 5/5 Verified August 21, 2026

Arrived quickly and the install was easy using the Della rental and the 24,000 btu unit operates very well and is quite. I am satisfied so far, just hope it heats as well as it cools.

Anthony T. 5/5 Verified June 15, 2026

Install almost complete. Should be evacuating and starting up soon.

James D. 5/5 Verified March 10, 2026

Works so good, really satisfied with my purchase.

Charles S. 5/5 Verified September 1, 2025

2nd install, went faster than the first. My barn is now comfortable in the summer! Sleek, minimal space required. I probably should have bought a tube bender.

Lawrence S. 5/5 Verified August 26, 2025

Amazing

Mark B. 5/5 Verified August 18, 2025

Great product Easy to install

Kyle B. 5/5 Verified July 28, 2025

Everything was a breeze to install and so far is working great

Kevin S. 5/5 Verified July 28, 2025

The unit is performing extremely well. It replaced the window unit that was previously cooling the room. Much quieter.

Craig B. 5/5 Verified July 22, 2025

Installed this (East Coast) over two days myself and replaced my 25000 btu window unit with it. This unit cools better than my bigger lower-seer window unit. I am fairly shocked I didn't buy this sooner. Simple install. You won't regret the purchase. I like the phone interface.

Max 5/5 Verified July 4, 2024

This has been the best purchase we have ever made. Excellent product and well worth the price.keeps a constant temp. And runs very quiet.

Mark W. 5/5 Verified June 13, 2023