Air conditioners are pretty cool.
*awkward pause*
But there’s an increasingly
popular variety of them that figuratively
and literally sucks.
That would be...
these bundles of joy.
Portable air conditioners seem to be taking
the world by storm, or at least have taken
the air conditioner isle of the hardware store
by storm.
But are they any good?
Do these cold-making machines have what it
takes to usurp the traditional window unit?
No.
Portable air conditioners are actually kinda…
bad.
Now it’s not like they don’t work!
And some of them aren’t quite as bad as
most.
Plus, they can really come in handy.
This one here is serving duty precisely because
the window it’s venting through isn’t
really suited to holding a window unit in
place with any sense of confidence.
And I know because I tried.
Yes, this here is the symbol of my shame.
The air conditioner that was never meant to
be.
But luckily for you I didn’t return it because
it’s gonna be a great visual aid!
Now, in this video I’m going to argue that
if you need an air conditioner you should
gravitate towards these simple window units
and away from those trendy portable units
*if you can*.
And to find out why, we need to learn a little
bit about air conditioning.
Air conditioners are mechanical devices which
collect and concentrate heat energy in order
to move it from one place to another.
The cold air they create is in fact ordinary
air that’s had its heat energy sucked right
out of it.
And of course, we can’t just bottle that
energy up
(though that would be super cool if we could figure that out)
so instead we
move it somewhere else--usually to outside air.
And inside every air conditioner you’ll
find three essential parts that make that happen.
This is the basis of nearly every air conditioning
and refrigeration system in service today.
The black cylinder contains a compressor which
squeezes a gas called a refrigerant into a
small space, decreasing its volume and increasing
the pressure it’s under.
The high pressure gas, which has now gotten
quite hot thanks to the fact that it just
got compressed, travels through these pipes
into the second key component; the condenser.
The condenser is a heat exchanger designed
to cool that hot gas down as quickly as possible.
The densely spaced fins increase its surface
area to speed up the heat transfer, and a
fan helps to speed it along even more by blowing
air across the fins.
Since the refrigerant is now pressurized,
its boiling point has increased.
And in fact, its boiling point has increased
so much that once we get it down to something
like 130 or 150 degrees, it will condense
into a liquid.
So, as the hot gas winds its way through all
these pipes and its heat energy gets transferred
to the air, it slowly turns into a liquid,
releasing a ton of heat energy as it does so.
Now here’s where the magic happens.
That liquid is being held back by a metering
device such as a thermal expansion valve,
to keep the pressure high in the condenser
and limit the amount of liquid refrigerant
that can pass through.
This basic air conditioner uses a capillary
tube, a long copper tube with a very small
internal diameter, to restrict the refrigerant
and thus limit its flow.
But once it makes it through to the other
side, it finds itself in a second heat exchanger,
called the evaporator.
This one is functionally identical to the
condenser, except the pressure inside here
is much, much lower thanks to the suction
created by the intake side of the compressor.
Once inside here, the refrigerant can relax,
and its boiling point suddenly shoots way
way down, like into the well-below-zero territory.
And that means it’s gonna spontaneously
boil --or evaporate-- because, well, it’s
too hot for it to remain a liquid.
But to change phases back into a gas, it needs
to get energy from somewhere.
And luckily, the fins of the evaporator help
it absorb the energy in the room, and the
effect is that the room gets colder.
In effect the heat energy inside the room
is being used to warm up the refrigerant as
it evaporates.
Thinking about this can be kinda weird because
we like to think of the evaporator as getting cold,
which it is, but it’s getting cold
because it’s pulling heat energy out of
the air and into the refrigerant inside of
it.
Coldness is really just less concentrated
heat energy, and since heat likes to go towards
cold places to spread out, it naturally finds
its way (with the help of a fan).
After the refrigerant has absorbed as much
energy as it can, it reenters the compressor
where the cycle starts all over again.
Once it’s under high pressure, it will be
able to condense into a liquid again, releasing
the energy it just absorbed to the outside
air through the condenser.
Now, I don’t want to get too far into the
physics of how this works, nor talk about
what makes refrigerants special and why they
have been and continue to be a notoriously
tricky set of chemicals to manage, so all
I really need you to know for this video is
there’s a compressor, a hot side, and a
cold side.
If we’re cooling a room, we want the hot
side outside and the cold side inside.
Then we can move the heat energy from inside
the room to the outside air, cooling the room.
So, let’s take a look at where these components
are when the window unit is in operation.
When resting in a window, the bulk of the
machine is actually outside of the space it’s cooling.
The compressor and condenser are both outside,
and thanks to the generous amount of styrofoam
insulation, we get a pretty good thermal barrier.
When cooling, none of the actual air in the
room is moved outside--only the refrigerant,
and thus the heat energy it’s absorbed,
makes it out.
This maximises efficiency.
If you have a central air conditioning system,
you probably have what’s called a split system.
Here, the compressor and condenser (along
with a cooling fan) are contained in a single
unit which sits outside, and copper refrigerant
lines are run into the building to a separate
evaporator located in an air handler or incorporated
in a furnace.
See?
It’s a split system, as the evaporator and
condenser are split apart.
These systems are highly efficient, with the
entire hot side located outside and away from
the living space, and only a tiny hole is
required in the home’s thermal barrier to
move the refrigerant in and out.
Alright, and now let’s take a look at a
portable air conditioner.
You may notice that the entire machine is
inside.
That means not only is the cold side inside,
the hot side is inside, too.
Well.
That’s not great.
We want the energy being absorbed by the evaporator
and released into the condenser to make its
way outside somehow.
So, what to portable air conditioners do?
They suck in indoor air through these vents,
blow it across the condenser to cool it off,
and then push it outside through that hose.
That last sentence is very important.
They pull in air through these vents,
air that they just cooled, mind you,
and blow it outside.
That sounds pretty friggin stupid, just on
its face.
Now, it’s not like it doesn’t work.
If these didn’t work they wouldn’t be
nearly as popular as they are.
Also!
Two-hose portable air conditioners, which
suck in *outside* air to cool the condenser
and then blow it back out in two separate
hoses, are available, but they are an increasingly
rare part of the portable air conditioner
universe and the vast majority on sale are
single-hose units just like this one.
So, if this machine relies on drawing air
in through these vent slots to cool the condenser,
and then has to barf the now hot air outside,
that means not only is it sacrificing some
of the cool air it just generated, it’s
also creating a low pressure environment in
whatever space it’s in.
Now the air pressure outside room is greater
than the inside.
And that means that outside air is going to
make its way in through the walls to replenish
the air that just left.
You can’t just expel air from a room without
it getting replaced somehow
(otherwise you’re in a vacuum chamber and I advise you leave as soon as possible).
And what replaces it is ultimately the hot
outside air that you’re fighting against.
Genius!
And thus we’re at the core of this issue.
Single-hose portable air conditioners will
always be significantly less efficient than
a window unit because they’re not just pulling
the heat energy out of your room.
They’re also pulling the air out, too.
In fact, if you go to a hardware store and
take a look at a fresh assortment of portable units,
you’ll often find that they have
two cooling capacities listed these days.
Why?
Well, because newer testing methods are accounting
for the losses brought about by this hose,
so while the unit may technically be able
to move 8,000 BTUs per hour, thanks to the
warm air it’s drawing back in (as well as
its own cold air it’s blowing back out)
it’s effectively only moving 6,000 BTUs
per hour.
So, basically it’s 25% less efficient.
But it’s actually much worse than that!
This little 5,000 BTU window unit consumes
455 watts.
If we take a look at this 5,500 BTU portable
unit from LG, you’ll see that it uses over
a kilowatt!
That’s more than double the input power
required to generate only 10% more cooling.
A window unit that consumes that much power
can produce roughly double the cooling capacity.
So yeah.
Eek.
Now I’m not here to say that these are terrible
devices and you’re a fool if you own one.
‘Cause I’d be calling myself a fool twice
if that were the case.
But I will say that in general, these should
be your last resort.
If you have the option to use a traditional
window unit, take it.
It’s much more energy efficient and it will
cost less to run.
And yeah, I get it.
They’re ugly.
They block your view from the window.
They’re not exactly attractive from the
outside either.
But it’s not just energy efficiency that
they’re better at.
Air conditioners are noisy.
They’re noisy because they’re mechanical
devices, with a buzzy compressor and two droning
fans moving air around.
With a traditional window unit, the compressor
and one of the two fans are outside.
Thanks to that thermal insulation, you get
a lot of sound insulation, too.
You’ll certainly notice a difference when
the compressor is on versus when it’s not,
but it’s often pretty subtle.
Especially because, as is the case for many
windows units, the same motor drives the indoor
blower fan and the condenser fan, so the only
part that cycles on and off is the compressor.
[sound of fan running]
[sound level increases slightly as compressor kicks in]
And of course, split systems are even quieter
because the loud parts are nowhere near the
living space.
[compressor and fan switch on]
Compare that to this thing.
Not only is the compressor now inside the
room you’re trying to work or sleep in,
but so is the condenser fan.
The result is that it’s not that noisy when
it’s only running the circulator fan.
But when its thermostat calls for cooling,
it gets way, way louder!
Suddenly, the compressor kicks in (which again,
is inside the room) and a second fan turns
on to expel the heat from the condenser.
It’s a good thing the condenser fan shuts
off when it’s not actively cooling, as otherwise
it would suck even more air out the room.
But it means there’s a stark difference
in noise levels between not cooling.
[a moderately quiet fan noise]
And cooling.
[compressor kicks in, and a second, much louder
fan spins up at the same time]
[it's really quite dreadful]
And if you’re trying to sleep in the same
room as one of these, you’ll have to put
up with it going from pretty quiet to loud
as hell and back over and over again.
This is a cheap in-house brand unit from that
place where you save big money so I wasn’t
expecting it to be whisper quiet, but I’ve
also got a more proper unit from LG that,
while a little more elegant in the way it
handles the transition from cooling to not
cooling and vice versa, is still much much
louder when it’s cooling.
[fan noise]
[a second fan spins up]
[compressor kicks in]
I’m a pretty heavy sleeper, and even for
me it can be a challenge to ignore the thing
and fall asleep.
And another thing to consider is that while
window units steal a bigger chunk of your
windows, they don’t steal your floor space.
Portable units aren’t small and they can’t
sit flush against the wall thanks to the hose,
so be prepared to re-arrange a little furniture.
And by the way.
That hose?
It gets hot!
That heat energy it just concentrated isn’t
gonna go away without a fight, and since this
hose isn’t insulated at all, some if it
is coming right back into the room.
Fantastic.
But, I’ll admit.
Portable A/C units are handy.
Really handy.
They don’t need proper installation like
a window unit does
(which is quite a pain, I might add).
They can easily be moved from room to room
thanks to the wheels they’re on
(that’s why the call them portable).
And they fit window types that might otherwise
be unable to accommodate an air conditioner,
such as vertical windows or even patio doors.
You could even run them through a small dedicated vent, if you choose.
But sadly, their single-hose design makes
them, honestly, a terrible device when it
comes to efficiency.
I’d like to see more double-hose units available
for sale.
They’re still gonna have the noise and floorspace
disadvantages, but they at least regain much
of their efficiency back.
Last year I tried a portable mini-split system,
with a separate outdoor compressor and condenser
unit, and an indoor evaporator unit connected
via a flexible refrigerant hose.
Sadly, my unit had a refrigerant leak and
stopped working after a few weeks.
It looks like that’s a common problem, but
let me tell you it was blissful while it worked.
Quiet, efficient, and effective.
I’d like to see this product get more development,
but I also understand that it’s got way
more limitations than even a window unit.
Unless you want to get creative with some
sort of exterior wall bracketing, this is
limited to a ground-floor room or a room with
a balcony or something similar.
But anyway.
If we’re gonna keep using these things,
can we please get more dual-hose units?
I get that they’re less flexible, particularly
with vertical or narrow windows, and so are
probably less desirable, but hopefully with
more people aware of the energy losses caused
by continuously pushing the air out of your
home, we’ll see increased demand.
Still, if you’re looking for an air conditioner
in a situation where a window unit could work--you’re
seriously better off going with the window
unit.
Contrary to what you might think, portable
units are certainly not an upgrade.
Other than their portableness.
That’s, that’s pretty cool.
Thanks for watching, and I hope you found
this video to be as cool as a correctly charged
air conditioning system.
I do want to explore air conditioning a little
more because I find it fascinating.
The way that we exploit the physical properties
of certain gasses to make heat energy move
where we want it to go is kinda mind-blowing.
Oh, and by the way, not all refrigerants are
crazy complex chemicals.
Some small refrigerators and air conditioners
are starting to be charged with propane.
Propane, also known as R290, is becoming an
increasingly common refrigerant thanks to
its abundance and relative environmental harmlessness.
Unfortunately it’s also flammable which
makes servicing these a little tricky, and
makes it unsuitable for larger units which
need a lot of refrigerant.
But especially for small, cheap units like
these things that are likely to simply be
disposed of when they die rather than actually
serviced,
it’s a great opportunity to use it.
This machine, though, while it is charged
with a flammable refrigerant, uses difluoromethane,
or R32.
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Thanks for your consideration, and I’ll
see you next time!
♫ icy smooth jazz ♫
...the cold air they create is in fact ordinary
air, eh.
Eugh, eugh blaugh ugh.
I’m--this tone is all wrong.
OK…
maybe move at like a pace that makes
sense.
Yeah, that’s written wrong.
Well, that’s fine.
And now I will record that line as written!
Or at least have taken the hardware isle of
the air condition… the hardware!
Arghh… nope.
Air conditioners are nois…
I should move this again.
Coldness is really just less concentrated
heat energy, and sint he…
Augh!
Sint.
Since heat!
SINCE heat!
It’s a wo...the Since!
Since is the word.
Since.
