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 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.

As you can see, all the models in the list have a specified cooling capacity of 8,000 BTU by the old standard. By the new standard, seasonally adjusted cooling capacity ranges from as high as 5,500 BTU all the way down to as little as 4,000 BTU.

This means that even the most efficient 8,000 BTU units on the market, still lose 2,500 BTU in rated cooling capacity after accounting for heat loss via ducting and infiltration air.

The least efficient units get their rated capacity cut in half. There are several units on the market with a SACC of 4,000 BTU that are sold as 8,000 BTU air conditioners.

We see similar drops drop in other size categories. For example, there are several 14,000 BTU units on the market with a SACC of only 7,500 BTUs. The most efficient 14,000 BTU units have a SACC of 9,500 to 10,000 BTUs – still 4,000 BTUs less than advertised 14,000 BTU capacity.

Our Recommendations

So, what are you to do with all of this data? Clearly, the actual BTUs (given by the SACC rating) is much less than the advertised BTUs for every portable AC unit on the market. There is not one model on the market that has the same SACC as its advertised BTUs.

Our recommendation is three-fold

1. Simply buy the highest SACC unit you can find at the lowest price

All portable AC units on the market have roughly the same

This leaves us with only one factor to know the difference between one model vs another: cooling capacity – more precisely, seasonally adjusted cooling capacity (SACC).

So, when shopping for a portable AC unit, look for models with a high SACC for their BTU class (8,000, 10,000, etc.) to find the “best” units for that respective size class.

In the 8,000 BTU size class, the LG LP0818WNR and the LG LP0817WSR are the best options. Both units have a SACC of 5,500 BTUs which is the highest in the category. The BLACK+DECKER BPACT08WT is the third best option with a SACC of 5,000 BTU.

In third and fourth place are the Frigidaire FFPA0822U1 (4,400 BTU) and Honeywell MO08CESWK (4,000 BTU).

Thus, our rankings for the best 8,000 BTU portable air conditioners are the following:

• 1. LG LP0818WNR
• 2. LG LP0817WSR
• 3. BLACK+DECKER BPACT08WT
• 4. Frigidaire FFPA0822U1
• 5. Honeywell MO08CESWK

2. Consider a 10,000 BTU model instead

You can often find high SACC cheap 10,000 BTU units for not much more than expensive 8,000 BTU units.

In terms of exact model recommendations – we would recommend the 6,500 BTU (SACC) LG LP1017WSR. The LP1017WSR gives you 1,000 more BTU than even the highest SACC 8,000 BTU unit and only retails for about $50 more. We believe this slight price increase is well worth the extra 1,000 BTUs (SACC).

3. Consider buying a 9,000+ BTU (SACC) unit instead

Our testing showed a quantum leap in performance between units with a SACC lower than 9,000 BTUs and units with a SACC higher than 9,000 BTUs.

9,000+ BTU (SACC) units cooled the air in our test environment (an approx. 150 sq. ft. room) much faster and to a much lower temperature (at least 72° F).

Sub 9,000 BTU (SACC) units could not cool the air nearly as quickly or to the same low temperatures (most could only reach 75° F even after 2 hours of testing).

Thus, it is our strong recommendation that you buy a 9,000+ BTU (SACC) unit if at all possible. There are currently only two viable options on the market:

• The LG LP1419IVSM
• The NewAir NAC14KWH02

The LG does have several advantages over the NewAir

• It has a slightly higher SACC of 10,000 BTU compared to 9,500 BTU for the NewAir.
• It has a slightly better SACC/watt ratio (better energy efficiency) than the NewAir because of its higher SACC.
• It is slightly better built than the NewAir. Yes, all portable AC units are highly durable but the LG is slightly better built than the NewAir nonetheless.

If you cannot afford a 9,000+ BTU (SACC) unit, a sub 9,000 BTU (SACC) unit like the LG LP0818WNR or LG LP0817WSR could still work given that the space

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

However, the only way to guarantee that you’re putting yourself in the best possible position to properly cool any given room or space under any possible circumstance is to purchase a 9,000+ BTU (SACC) unit. Hence why it’s our overall bottom line recommendation.

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