Quiet Portable Air Conditioners
Portable air conditioners make a lot of noise.
You wouldn’t know this looking at the product descriptions for some of the most popular units on the market. It’s not uncommon to see units marketed as having “Quiet Operation”. One model lists its noise output as being only 44 dB, with a graphic on its packaging showing how this is a noise level that's somewhere in between that of a library and an office.
Under what conditions did this model produce only 44 dB? On cooling mode or fan only mode? At what distance was the noise level measured? Certainly not anywhere close to the actual AC unit.
Our testing revealed that in the area immediately surrounding a portable AC unit (at a distance of 2 ft.) the average unit produces about 60 dB of noise.
At longer distances (at 10 ft.) most units still produce about 55 dB of noise.
These measurements were taken with models operating on cooling mode and maximum fan speed. The same model that claimed a noise output of only 44 dB was measured at 59.5 dB at 2 ft. and 54.2dB at 10 ft. on cooling mode and high fan speed.
At lower fan speeds, noise output is further reduced.
However, the actual quality of the noise changes quite a bit.
You see, portable AC units primarily make only two different types of noise:
- fan noise and
- compressor noise
Portable AC unit fan noise sounds just like fan noise on any other appliance with fans – a clean white noise with a “shhhhhh” sound.
Compressor noise is hardly a clean white noise. In fact, it’s far from it.
Compressor noise varies from a low frequency buzzing sound (“bzzzzzz”) to a higher frequency buzzing sound.
On high fan speed the AC unit’s compressor noise is masked by its fan noise.
On low fan speed this is no longer the case.
So, while the measured dB on low fan speed is less, the compressor noise is no longer masked. Instead of hearing primarily fan noise as you do on high fan speed, you now hear the unpleasant buzzing noise of the compressor.
Thus, the vast majority of consumers will almost always run their portable AC units on high fan speed. This is really the only way to tolerate the underlying unpleasant noise generated by the unit’s compressor.
And, on that high fan speed, the noise level for most models is at approx. 60 dB.
The table below shows the exact measurements for a few select units on the market, measured 2 ft. away from each unit:
|Fan, high (dB)
|Black + Decker BPP10WTB
Note how all models listed here produce just about the same amount of noise on high fan speed.
No matter the manufacturer. No matter the model. Noise output is very similar for all units on the fan speed you're likely to use the most - high fan speed.
New compressor technology
To round out this analysis, we briefly need to talk about new compressor technology.
Both the Midea Duo and LG LP1419IVSM are equipped with inverter (variable speed) compressors.
Most other portable AC units on the market are equipped with single stage compressors.
Inverter compressor models run at lower power with more of a drop in noise output on lower fan speeds. Single stage compressor models run at the same power level with much less of a drop in noise output on lower fan speeds.
When it comes to raw noise output, inverter compressor models are "quieter" on lower fan speeds.
The problem is that they produce the same unpleasant buzzing noise as single stage compressor models.
And so, just like a single stage compressor model, you won't want to run an inverter compressor model on lower fan speed. Instead, you'll want to run it on high fan speed to better mask the unpleasant noise of its compressor.
Portable air conditioner noise output is a fairly simple topic.
You really only need to know three things about it:
You'll almost always want to run a portable AC unit on high fan speed
so that fan noise can mask unpleasant compressor sounds.
On high fan speed all portable AC units are loud
with a noise output of approx. 60 dB.
On high fan speed all portable AC units are equally loud
in terms of noise output, there’s really nothing to gain by going with one model over another or even one size class over another (e.g. 8,000 vs 14,000 BTU). Look at features other than noise output to determine if one model is a better option than another.
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I like your chart and data you've acquired. I'm looking into getting the LG LP1419IVSM and returning the current Hisense 12,000-BTU unit I just got as it puts out around 63dB on Low settings. It has a very loud, standard rotary compressor.
From what I've read online the new LG Dual Inverter Compressor can be quieter than standard compressors in the way of not suddenly completely shutting off like standard compressors (very loud) and maintaining a steady, low speed of around 30% when not cooling. I'm hoping the LG LP1419IVSM will make a big difference in noise for me.
If your chart is correct it "sounds" like it will.