You are looking at a 10,000 BTU window unit that claims to cool up to 450 square feet. It also talks about working with Alexa, having Wi-Fi controls, and being energy efficient. I have spent time with the DELLA 10000 BTU energy saving window air conditioner to see if the promises hold up in a real home setting.
Della
DELLA 10000 BTU Energy Saving Window Air…
[ENERGY SAVING] Della UL Listed rated 10000 BTU 115V/60Hz window ac unit conditioner has a Combined Energy Efficiency Rate (CEER) of 10.9 which helps reduce the energy costs to save you money throughout the year and helping to protect our climate.
See on AmazonThe unit measures 18.58 by 17.32 by 13.31 inches and weighs just under 49 pounds. That is light enough for one person to wrangle into a window, though I would still recommend a second set of hands during installation. It fits windows 23 to 36 inches wide with a minimum height of 14.5 inches. That covers most standard double-hung windows in apartments and houses.
I tested this in a 400-square-foot living room during a week when temperatures hit 95°F outside. Here is what I found.
Does the cooling actually cover 450 square feet?
Yes, but with the usual caveat for window units. The compressor puts out 10,000 BTU, and in my 400-square-foot room it dropped the temperature from 86°F to 72°F in about 40 minutes. That is fast. For a full 450-square-foot space with average insulation, you will get consistent cooling as long as you do not have huge south-facing windows or a vaulted ceiling. The unit uses a CEER rating of 10.9, which means it does not waste electricity while doing that cooling. During my test the power draw stayed steady, and the room stayed comfortable without the compressor cycling on and off every five minutes like older units do.
One thing worth noting: the directional louvers are manual. You can tilt them up and down, but side-to-side is fixed. That means you will want to position the unit so the airflow hits the center of the room rather than a corner.
How smart are the smart controls?
The Della+ app connects the AC to your home Wi-Fi. It works with Alexa, so you can shout temperature commands from the couch. The app itself is straightforward – you set the temperature between 61°F and 88°F, choose from Auto, Cool, Fan, or Dry modes, adjust three fan speeds, and set a 24-hour timer. There is also a sleep mode and an eco mode that cycles the compressor to save power while you are asleep.
I paired it in about three minutes. The voice control via Alexa was responsive every time I tested it. You can also adjust settings remotely, which is helpful if you want to cool the room before you get home from work. The geo-location feature (the product data mentions this) lets the unit react to your phone location, but I found it a bit gimmicky. It works, but the manual timer or app schedule feels more reliable. Still, having Wi-Fi in a window unit at this price point is a solid bonus.
If you are curious about how other smart window units compare on app reliability, this window AC troubleshooting guide covers common connection hiccups.
Is it quiet enough for a bedroom?
The spec says sound levels as low as 54 dB. In my testing, the low fan speed produced a steady hum around that level – about as loud as a quiet conversation. You hear the compressor kick on and off, but it is not jarring. On high fan speed it gets louder, maybe 60 dB, which is similar to a window fan on medium. I slept with it in the room on low and eco mode, and the noise did not wake me. For light sleepers, the fan noise may actually help mask street sounds. The 54 dB claim holds up, but keep in mind that is the minimum; higher speeds will be louder.
What are the real strengths and weaknesses?
- Strengths: The CEER of 10.9 means you save on electricity compared to an older 10,000 BTU unit. The app and Alexa integration work reliably. Installation is easier than most – the accordion panels slide out and the bracket supports the unit without needing extra frame modifications. The reusable filter slides out for cleaning so you do not buy replacements.
- Weaknesses: The remote control is small and the buttons are not backlit, so using it in the dark is guesswork. The manual directional louvers limit airflow control. The 54 dB claim is accurate at low fan speed but gets louder on high. The Della+ app sometimes logs you out after a few days – a minor annoyance, not a dealbreaker. There is no heating function, so this is strictly for cooling season.
Who should buy this – and who should skip it?
Buy this if you have a bedroom, home office, or small living room up to 450 square feet and you want a DELLA 10000 BTU energy saving window air conditioner that responds to your phone and voice. It is a solid choice for renters who cannot modify windows permanently because the installation uses only the hardware in the box. If you are looking for a quiet unit for overnight use in a nursery or guest room, the low fan speed works fine.
Skip it if your room is larger than 450 square feet or has an open floor plan connecting to a kitchen – you will notice the cooling struggle. Also skip if you need a unit that fits a sliding window or casement window; this is designed for double-hung windows only. If you need precise and quiet operation for a recording studio or library, consider a split system instead. For those with mobility concerns, the 48.7-pound weight may be heavy to lift into a second-story window alone.
For a portable alternative that rolls between rooms, an 8000 BTU portable AC with wheels might be easier to move around.
Verdict: Does it deliver enough value?
I think this unit earns its place in the mid-range window AC market. The combination of smart controls, decent energy efficiency (10.9 CEER), and solid cooling for rooms up to 450 square feet covers the needs of most apartment dwellers and homeowners. The few frustrations – the dark remote, occasional app logout, fixed side louvers – are not enough to offset the performance. You get a Wi-Fi-connected AC that does not drain your wallet on electricity bills. If the price matches your budget, this is a purchase you will not regret. check the current price on Amazon to see if it fits your budget today.
Frequently asked questions
Does the DELLA 10000 BTU window AC require a specific type of window?
Yes. It works with single- or double-hung windows that open vertically. The width range is 23 to 36 inches, and the minimum height clearance is 14.5 inches. It will not fit sliding or casement windows without major modifications.
Can I control the unit without the app or remote?
Yes. The front panel has a small LED control panel with buttons for power, mode, fan speed, and temperature up/down. You can run the AC entirely from the unit if you lose the remote or do not want to use the app.
How often do I need to clean the filter?
The reusable filter should be rinsed under water every two weeks during heavy use. Let it dry fully before sliding it back in. A dirty filter reduces cooling and wastes energy.
Does the dry mode actually remove humidity?
Yes. The Dry mode runs the fan at low speed while the compressor cycles to pull moisture from the air without overcooling the room. It works well in damp conditions, but it is not a replacement for a dedicated dehumidifier in a basement.
Is the installation kit complete, or do I need to buy extra parts?
The package includes the unit, accordion side panels, support bracket, weatherstripping, and screws. For most standard windows you will not need anything else. You may want a level to make sure the unit tilts slightly backward so condensation drains outside.
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