Della 10,000 BTU Smart Window AC Review: Alexa, App, CEER 10.9
A 10,000 BTU Wi-Fi window air conditioner for rooms up to 450 sq. ft. with Della+ app and Alexa control, a remote, Auto, Cool, Fan and Dry modes, eco and sleep modes and a listed CEER of 10.9.
By Daniel Brooks
Updated October 8, 2026
The Della 10,000 BTU Smart Window AC is a Wi-Fi unit for rooms up to 450 square feet, from a single bedroom to a large living room. It works with the Della+ app and Alexa, and the title highlights a GEO location feature. Among mid-size smart conventional window air conditioners, it offers a full set of modes and a stated CEER.
The main consideration is its 14.5 inch minimum window height. We evaluated it based on the manufacturer’s specifications.
Our Verdict
This Della is a well-rounded smart unit for a medium to large room. Its strongest points are the Della+ app with Alexa voice control, a remote, an LED panel, four modes (Auto, Cool, Fan and Dry), 3 fan speeds, sleep and eco modes, a 24-hour timer, a temperature range of 61°F to 88°F, a listed CEER of 10.9 and a UL listing.
The trade-offs are noise and fit. Della lists sound as low as 54 dB, while the specification sheet lists 56 dB, and the unit needs a window at least 14.5 inches high. There is no inverter. If you want smart, efficient cooling for a room up to 450 square feet, it is worth considering.
Della 10,000 BTU Window Air Conditioner
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | Della |
| Type | Smart window air conditioner |
| Cooling Capacity | 10,000 BTU |
| Room Size (listed) | Up to 450 sq. ft. |
| Efficiency | CEER 10.9 |
| Noise Level | 56 dB (specification); as low as 54 dB (manufacturer) |
| Voltage / Power | 115V, 60Hz, 959.5W, UL Listed |
| Window Fit | 23″ to 36″ wide, 14.5″ minimum height |
| Dimensions | 17.32″D x 18.58″W x 13.31″H |
| Weight | 48.7 pounds |
| Modes | Auto, Cool, Fan, Dry, plus Eco and Sleep |
| Fan Speeds | 3 |
| Temperature Range | 61°F to 88°F |
| Smart Controls | Della+ app, Alexa, remote, LED panel |
| Timer | 24-hour |
| Compressor | Rotary, no inverter |
| Refrigerant | R-32 |
Cooling Capacity and Room Size
Della rates the unit at 10,000 BTU for rooms up to 450 square feet and suggests a single bedroom, a large living room, a home, an office or an apartment. In practice, it is best matched to a living room or a large primary bedroom.
If your bedroom is well under 400 square feet, a smaller unit may be a better fit, since an oversized AC cools quickly and shuts off before removing much moisture.
For a living room near 450 square feet, the 3 fan speeds let you balance cooling speed and noise. Use the highest speed to bring the room down after a hot afternoon, then step down once it is comfortable.
ENERGY STAR publishes this general guide for sizing a room air conditioner by floor area:
| Room Size (sq ft) | Cooling Capacity (BTU/hr) |
|---|---|
| 100 to 150 | 5,000 |
| 150 to 250 | 6,000 |
| 250 to 300 | 7,000 |
| 300 to 350 | 8,000 |
| 350 to 400 | 9,000 |
| 400 to 450 | 10,000 |
| 450 to 550 | 12,000 |
| 550 to 700 | 14,000 |
| 700 to 1,000 | 18,000 |
Adjust for your room: reduce capacity by 10 percent for a heavily shaded room, increase it by 10 percent for a very sunny room, add 600 BTU for each regular occupant beyond two, and add 4,000 BTU if the unit cools a kitchen. Source: ENERGY STAR.
At its listed 10,000 BTU, it lines up with rooms of about 400 to 450 square feet, which matches Della’s coverage claim.
Installation and Fit
Della lists a fit for windows from 23 to 36 inches wide with a minimum height of 14.5 inches. Complete installation accessories are included, and Della says no major changes to the window frame are needed.
The cabinet measures 17.32 inches deep, 18.58 inches wide and 13.31 inches tall, and weighs 48.7 pounds. Plan on two people: one to hold the unit and one to secure it. Follow the manual and plug it into a standard 115V outlet.
Noise, Energy Use and Efficiency
Della lists sound levels as low as 54 dB, and the specification sheet gives 56 dB. That is acceptable for a living room and on lower settings in a bedroom.
The listed CEER of 10.9 is the standard rating for room air conditioners. The power draw is 959.5 watts. Eco mode, sleep mode and the 24-hour timer help reduce running time. The compressor has no inverter.
Controls and Smart Features
The Della+ app lets you control the unit anytime, anywhere, and it works with Alexa for voice commands. The GEO location feature named in the title can help automate cooling around when you come and go.
The remote and LED control panel cover all settings in the room. You get four modes (Auto, Cool, Fan and Dry), 3 fan speeds, sleep and eco modes, a 24-hour timer and a temperature range of 61°F to 88°F.
Voice control through Alexa is useful when the remote is out of reach, and the app lets other people in the household control the unit from their own phones. In a bedroom, a practical routine is to start cooling from the app on the way home, switch to sleep mode at bedtime and let the timer turn the unit off before morning.
Maintenance and Drainage
The title lists a reusable filter. Remove and rinse it regularly to keep airflow and efficiency steady.
Dry mode helps reduce humidity. The listing does not describe condensate drainage, so check the manual for how water is handled and for seasonal storage.
Pros and Cons
| Pros | Cons |
|---|---|
| Della+ app and Alexa support | Listed noise of 54 to 56 dB |
| Listed CEER of 10.9 | Needs a window at least 14.5″ high |
| Auto, Cool, Fan and Dry modes | No inverter compressor |
| Remote, eco, sleep and 24-hour timer | No heat mode |
| UL Listed |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Living rooms and large bedrooms up to 450 sq. ft. | Small bedrooms that need less capacity |
| Smart home users with Alexa | Windows under 14.5″ of opening height |
| Buyers who want app and remote control | Buyers set on an inverter compressor |
| Humid rooms that benefit from Dry mode | Anyone needing heating |
| Homes with a standard 115V outlet | Casement or sliding window owners |
Final Verdict
The Della 10000 BTU Smart Window Air Conditioner combines Della+ app and Alexa control, a remote, four modes, eco and sleep modes and a listed CEER of 10.9 for rooms up to 450 square feet. The compromises are a 14.5 inch minimum window height and no inverter. You can check the current price and details for the Della 10000 BTU Smart Window Air Conditioner, or compare other 10,000 BTU window air conditioners.
Frequently Asked Questions
Does the Della 10000 BTU unit work with Alexa?
Yes. It works with Alexa and the Della+ app, and a remote is included.
What size room is it for?
Della rates it for rooms up to 450 square feet. On the ENERGY STAR chart, 10,000 BTU fits rooms of about 400 to 450 square feet.
What window size does it fit?
Della lists windows from 23 to 36 inches wide with a minimum height of 14.5 inches.
How efficient is it?
Della lists a CEER of 10.9.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.