DELLA 8,000 BTU Smart Window AC Review: Wi-Fi, Alexa, 4 Modes
A smart window air conditioner for rooms up to 350 square feet, with a CEER of 10.9, Della+ app and Alexa control, a remote, 3 fan speeds, 4 modes, sleep and eco modes and a 24-hour timer.
By Daniel Brooks
Updated October 15, 2026
The DELLA 8,000 BTU Smart Window AC is a budget-friendly smart window unit for rooms up to 350 square feet. It brings Wi-Fi control through the Della+ app, Alexa voice support and a full set of modes to a price that sits below most name-brand smart units. Among conventional window air conditioners in this size, it has a 4.0 out of 5 average across more than 465 ratings on its listing.
DELLA lists a Combined Energy Efficiency Ratio of 10.9, 3 fan speeds, four modes, sleep and eco modes, a 24-hour timer and noise as low as 54 dB.
Our Verdict
The DELLA 8,000 BTU is a good value for anyone who wants app and voice control in a mid-size bedroom or small living room. You get a remote, an LED panel, the Della+ app and Alexa support, plus useful extras like a sleep mode and an eco mode. The GEO location feature in the listing title is a nice touch for starting cooling as you head home.
The trade-offs are noise and efficiency. At 54 dB it is not one of the quieter units, and a CEER of 10.9 is average. DELLA is also a smaller brand than LG or Midea. For smart features at a modest price, it is worth a look.
Della 8,000 BTU Window Air Conditioner
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Key Specifications
| Feature | Specification |
|---|---|
| Brand | DELLA |
| Model | 048-TL-W8KWD |
| Type | Smart window air conditioner |
| Cooling Capacity | 8,000 BTU |
| Room Size | Up to 350 sq ft (manufacturer) |
| CEER | 10.9 |
| Noise Level | As low as 54 dB |
| Voltage | 115V / 60Hz |
| Temperature Range | 61 to 88 degrees F |
| Modes | Auto, Cool, Fan, Dry |
| Fan Speeds | 3 |
| Window Fit | 23″ to 36″ wide, 14.5″ minimum height |
| Dimensions | 17.05″D x 18.58″W x 13.31″H |
| Weight | 44.8 pounds |
| Refrigerant | R-32 |
Cooling Capacity and Room Size
DELLA rates the unit at 8,000 BTU and for rooms up to 350 square feet. That matches the ENERGY STAR sizing guide for an 8,000 BTU window unit.
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.
A bedroom, home office, small living room or studio apartment is a good fit. DELLA also mentions large living rooms, but at 8,000 BTU we would stick to spaces near or below the 350 square foot rating, especially if the room gets afternoon sun.
The compressor is a standard rotary type with no inverter, so it cycles on and off to hold the set temperature. You can set anywhere from 61 to 88 degrees F.
Installation and Fit
The unit fits windows from 23 to 36 inches wide with a minimum height of 14.5 inches, and complete installation accessories are included. DELLA says no major changes to the window frame are needed.
At 18.58 inches wide, 13.31 inches tall and 17.05 inches deep, it is a typical size for an 8,000 BTU window unit. It weighs 44.8 pounds, so a second person makes installation safer and easier. Lower the sash onto the top rail, extend the side panels and secure the unit with the supplied hardware. Tilt it slightly toward the outside so condensation drains outdoors.
Noise, Energy Use and Efficiency
DELLA lists sound levels as low as 54 dB. That is typical for a non-inverter window unit. It is fine for a living room or office, though light sleepers may find it noticeable at night. Sleep mode and the lowest fan speed help.
DELLA lists a CEER of 10.9, which is average for an 8,000 BTU window unit, and the unit is UL listed. Eco mode saves energy by cycling the fan with the compressor. Using the app to schedule cooling only when you need it is another easy way to cut costs.
Controls and Smart Features
The smart features are the reason to choose this unit. The redesigned Della+ app lets you control the air conditioner from anywhere: turn it on or off, change the mode, set the temperature and adjust the fan. Alexa support lets you make changes by voice, and the GEO location feature named in the listing can start cooling based on where your phone is.
On the unit, a user-friendly LED panel covers every setting, and a remote is included. Four modes, auto, cool, fan and dry, cover most needs. Three fan speeds, a 24-hour timer, a sleep mode and an eco mode round out the controls.
Maintenance and Care
The reusable pre-filter slides out for cleaning. Rinse it every couple of weeks during heavy use and let it dry before reinstalling. A clean filter keeps airflow strong and helps the unit run efficiently.
At the end of the season, remove the unit or cover the exterior, and check the side panels and seals before reinstalling.
Everyday Use
The app makes the DELLA easy to fit around your schedule. A common routine is to have the unit start cooling as you leave work, then switch to sleep mode at bedtime. Dry mode is handy on muggy days that are not especially hot, since it removes moisture without overcooling the room. Before setup, check the app’s network requirements, since many smart air conditioners connect only to certain Wi-Fi bands.
Placement Tips
Keep curtains and furniture clear of the front grille so the unit can move air freely. Close blinds on sunny windows during the hottest hours, and keep the door closed so the cool air stays in the room you are using. In a small living room, aim the louvers toward the seating area rather than across an open doorway.
Pros and Cons
| Pros | Cons |
|---|---|
| Della+ app, Alexa and GEO location | 54 dB is typical, not quiet |
| Remote and LED control panel | CEER of 10.9 is average |
| 3 fan speeds and 4 modes | Non-inverter compressor |
| Sleep mode, eco mode and 24-hour timer | Smaller brand than LG or Midea |
| Complete installation kit | Heavier than some 8,000 BTU units |
Who Should Buy It
| Who Should Buy It? | Who Should Look Elsewhere? |
|---|---|
| Bedrooms and small living rooms | Rooms larger than about 350 sq ft |
| Alexa households on a budget | Light sleepers who need a quiet unit |
| Anyone who wants to cool before arriving | Buyers who want top efficiency |
| Renters with standard double-hung windows | Buyers who prefer a major brand |
Final Verdict
The DELLA 8,000 BTU Smart Window AC brings app control, Alexa support, GEO location, three fan speeds and a full set of modes to a modest price. It suits bedrooms and small living rooms where smart features matter more than whisper-quiet operation. Expect average noise and efficiency. You can check the current price and details for the DELLA 8,000 BTU Smart Window Air Conditioner.
Frequently Asked Questions
What size room does the DELLA 8,000 BTU cool?
DELLA rates it for rooms up to 350 square feet, such as a bedroom, office or small living room.
Does it work with Alexa?
Yes. It connects to the Della+ app over Wi-Fi and works with Alexa voice commands.
What windows does it fit?
It fits windows from 23 to 36 inches wide with a minimum height of 14.5 inches.
Does it have a sleep mode?
Yes. Sleep mode adjusts the unit for quieter, more comfortable overnight cooling, and the 24-hour timer can switch it off automatically.
How efficient is it?
DELLA lists a CEER of 10.9, which is average for an 8,000 BTU window unit. Eco mode helps reduce energy use.
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.