The Best 8,000 BTU Portable Air Conditioners

8,000 BTU portable air conditioners are not really 8,000 BTU portable air conditioners.

Two factors reduce the actual BTUs:

• heat added back into the room by the portable AC unit’s ducting
• heat added back into the room by warm outdoor air (called “infiltration air”) that inevitably gets sucked into the room as the AC unit exhausts warm air out of the room.*

*A portable AC unit has to exhaust warm air to operate properly. This exhausting (removal) of air creates a pressure difference between the room the AC is actively cooling and the outdoors. This, in turn, causes warm outdoor air to get sucked into the room.

In the past, testing for portable AC cooling capacity (BTU) did not take into account these two inefficiencies (heat added by ducting and infiltration air) - hence, the consistent 8,000 BTU rating for all models in the 8,000 BTU category.

Today, 8,000 BTU units are still rated as 8,000 BTU units but a new rating has been added that does take into account the two inefficiencies we mentioned above.

This new rating is called seasonally adjusted cooling capacity – SACC.

The formula for SACC is

SACC = ACC₉₅ × 0.2 + ACC₈₃ × 0.8

In which

ACC₉₅ = Capacity_SD − Q_{duct_SD} − Q_{infiltration_95}
ACC₈₃ = Capacity_SD − Q_{duct_SD} − Q_{infiltration_83}

In short, the SACC not only takes into account heat loss from ducting and infiltration air (caused by pressure differences) but it does so at two different outdoor temperatures – 83° F and 95° F. The portable AC unit’s performance at 83° F accounts for 80% of total SACC while its performance at 95° F accounts for 20% of total SACC.

The end result

All of this is to say that by the old standard for measuring BTUs there was no way to tell the actual performance difference between one 8,000 BTU unit vs another.

By the new standard – SACC – it’s much easier to spot the difference between the actual real life cooling capacity of different 8,000 BTU models on the market.

Let’s take a look at the four (approx.) 8,000 BTU models we tested most recently:

As you can see, three of the four models have a specified cooling capacity of exactly 8,000 BTUs by the old standard. By the new standard, their seasonally adjusted cooling capacity (SACC) ranges from 5,000 BTUs to 4,000 BTUs.

This means that even the most efficient 8,000 BTU unit we tested, still loses 3,000 BTUs in rated cooling capacity after accounting for heat loss via ducting and infiltration air.

The least efficient unit gets its rated capacity cut in half from 8,000 traditional BTUs to 4,000 SACC BTUs.

We see similar drops in other size categories. For example, there are several 14,000 BTU units on the market with a SACC of only 7,700 BTUs. The most efficient 14,000 BTU units have a SACC of 12,000 BTUs – still 2,000 BTUs less than the specified traditional 14,000 BTU capacity.

Real world application

So, what are you to do with all of this information? Clearly, the actual BTUs (given by the SACC rating) is much less than the commonly specified traditional BTUs for each portable AC unit we tested (and for most models on the market).

First of all, you can rest assured that the actual BTUs, that is to say SACC BTUs, are actually representative of real world performance.

In our testing, models with higher SACC BTUs performed better. Conversely, models with lower SACC BTUs performed worse.

The following table describes how long it took each unit we tested to lower room temperature in a 100 sq. ft. room.

We tested each model three times. Once at an outdoor temp. of 83° F, once at 86° F, and once at 91° F.

Unmarked time = time, in minutes, to lower room temp. from 86° F to 72° F.
* time to lower room temp. from 86° F down to 73.0° F.
** time to lower room temp. from 86° F down to 76.1° F.
*** time to lower room temp. from 86° F down to 78.1° F.

In each test, the intention was to measure how long each model would take to lower room temp. from 86° F down to 72° F, but most of 8,000 BTU models couldn't do so in the allotted time (up to 2 hours).

The SereneLife completely shut down during the test at higher outdoor temperatures.

In any case, you can clearly see how higher SACC BTU units performed better in this test while lower SACC units performed worse.

Based on this testing alone, the Black+Decker and Dreo clearly stand out as the two best cooling (approx.) 8,000 BTU portable AC units we tested.

Additional factors

So far, we've seen that you can use SACC as a guideline to determine the best cooling "8,000 BTU" models on the market.

But, cooling performance isn't everything. You should also consider

• energy efficiency
• noise output
• installation difficulty and
• value

First up is energy efficiency. Generally, the higher the SACC, the better the energy efficiency.

Next up is noise output. Again, the Black+Decker and Dreo stand out as the two best units. They're both quieter than the Shinco and SereneLife.

When it comes to installation difficulty, the Dreo is easiest to install because it comes with more window panel extensions. The Dreo comes with four total window panels. The other three models all only come with two panels.

Unfortunately, the Dreo is a terrible value. It has, by far, the worst SACC/$ ratio of the four (approx.) 8,000 BTU portable ACs we tested.

Final recommendation

Taking account all of the factors we outlined above, the best 8,000 BTU portable air conditioner we tested was the Black+Decker BPACT05SM.

The Dreo AC318 was a very strong contender, but it usually costs at least $100 to $150 more than the Black+Decker with very similar cooling performance.

The Black+Decker offers the best combination of cooling performance, energy efficiency, and value in the 8,000 BTU category.

Our complete rankings of the four (approx.) 8,000 BTU models we tested:

• 1. Black+Decker BPACT05SM
• 2. Dreo AC318S
• 3. Shinco SPF1-08C
• 4. SereneLife SLPAC8

One last caveat

Our testing showed a quantum leap in performance between (approx.) 5,000 SACC BTU models like the ones we covered above and 10,000 SACC BTU models.

10,000+ BTU (SACC) units cooled the air in our test environment (an approx. 100 sq. ft. room) much faster and to a much lower temperature.

5,000 BTU (SACC) units could not cool the air nearly as quickly or to the same low temperatures.

Thus, it is our strong recommendation that you consider buying a 10,000 SACC BTU unit instead of a 5,000 SACC BTU unit if at all possible.

The cheapest 10,000 BTU (SACC) unit we recommend is the Frigidaire FHPC142AA1. It provides double the cooling capacity of the Black+Decker BPACT05SM and is much less than double the cost.

If you cannot afford a 10,000 BTU (SACC) unit like the Frigidaire FHPC142AA1, a 5,100 BTU (SACC) unit like the Black+Decker BPACT05SM could still work if the space

• Is sufficiently small and
• Isn’t especially challenging to cool (e.g. doesn’t have a lot of windows or is on a second story)

However, if the space you need to cool is large and/or challenging to cool, we strongly recommend that you opt for a 10,000+ BTU (SACC) unit like the Frigidaire FHPC142AA1 instead.

For a more in-depth discussion on portable air conditioner sizing see our general buyer’s guide.