On the positive side of things, this latest version of the ARC-14S does now meet our 9,000 SACC BTU requirement for portable AC units.

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Overall though, the Midea Duo is the far better portable air conditioner. We would only recommend the ARC-14S over the Duo if the Duo isn't available (the best portable AC units often go out of stock during the peak of the summer season) or if you can find the ARC-14S at a substantial discount (i.e. for much less than its usual retail price of approx. $500).

FYI. The intake hose installation is optional. I ended up not installing it and let the intake suck in the air from the room instead of the outside.

If you feel that the machines outgoing duct is too hot, you can always insulate it. Also the duct on the single duct machine gets hot as well.

Modes – cool, dry, fan Set temp range - 61 to 89° F Fan speeds - 3 Timer - yes, 1 to 24 hr in 1 hr increments – to set press timer button and then plus minus buttons Lights turn off - no

3. The last reason why the unit’s actual cooling capacity is much less than 14,000 BTU has to do with the conditions under which it is tested. Portable AC units tend to perform much better – have a better cooling capacity – when outdoor temperatures are lower. Conversely, they perform worse when outdoor temperatures are high.

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End Adapters – not pre-installed but they screwed in very easily (turn hose connector counterclockwise onto end of hose) AC Side Hose Connection – just press in – clicks in on both sides. Rotate end and pull to remove Window Kit Side Hose Connection – with grates already screwed into window bracket, just press end of hose into the grate (clicks in on two sides)

Top filter (evaporator) - only unit tested with carbon filter Carbon filter leaves residue everywhere when taken out of plastic.

The least efficient units have their BTUs almost cut in half. The Black + Decker BPACT14WT, for example, is marketed and sold as a 14,000 BTU portable air conditioner but it’s actual cooling capacity (SACC) is only 7,700 BTUs.

The ARC-14S we tested for review drew 1250 watts of power operating at maximum cooling capacity. This is only slightly less than the power draw of most other 14,000 BTU units, which averages to about 1300 watts. The Midea Duo, for example, drew exactly 1300 watts of power.

Infiltration air is warm outdoor air that gets pulled into the conditioned room due to pressure differences between the outdoor air and the indoor air.

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The ARC-14S we tested in 2019 with a SACC of 8,900 BTUs didn't meet this 9,000 SACC BTU threshold (and it showed in our testing), while the latest version of this model now does.

And this pressure difference causes warm outdoor air to get pulled into the room which reduces the unit’s actual cooling capacity.

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This is the exact opposite result of what we get using EER. The Midea Duo now appears to be the more efficient unit. And in a real world application, it would be the more energy efficient unit.

1. the unit has multiple ducts - one pulls in warm air from the outdoors and the other exhausts hot air to the outdoors. The ducts are “sealed” but they’re very large (about 5 inches in diameter) and made of a thin plastic material.

Single duct machine pull air into the dwelling through all doorways and windows, due to the vacuum created by blowing the hot air out through the single duct.

Under the old standard for testing portable AC units, the outdoor temperature at which they were tested was relatively mild. Under a new standard, called seasonally adjusted cooling capacity (SACC), outdoor test temperatures are higher – more representative of real world applications.

Under the old standard for calculating energy efficiency – using EER (energy efficiency ratio) – the Whynter would be more energy efficient.

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Bottom filter (condenser) - no filter for condenser with air coming from outside with only plastic grate – intake filter sold separately.

Our own testing showed a quantum leap in performance going from a sub 9,000 SACC BTU unit to a 9,000+ SACC BTU unit. Higher SACC (9,000+ BTU) units cooled much faster and to lower temperatures even in a relatively small test environment – only 150 sq. ft.

Window Kit Adjustment – 2x screws on either side of primary bracket that attach it to either extension Window Kit Min - 19 7/8" (20” spec) Window Kit Max – 46 ¼” (47” spec) with long extension on one side and short extension on other side and with screws holding three pieces together (could go longer with no screw attachment) With no screw attachment you can add about 1.5” on each side so 49 ¼” if you DIY it

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Our recommendation – don’t use the carbon filter – it needs to be replaced at cost (cannot simply be cleaned) and it has minimal impact (supposed to reduce odors/VOCs but you can buy an air purifier separately for that purpose)

Window Kit Included Parts – primary window bracket, long extension, short extension 8x screws for 2x grates ("fixtures") that screw into window bracket and fit into hose connectors 2x "covers" that fit into fixtures when hose is not connected to window bracket

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But even this latest version still has substantially less cooling capacity (9,500 SACC vs 12,000 SACC for the Duo) and energy efficiency (a 7.3 SACC/watt ratio vs a 9.2 SACC/watt ratio for the Duo) than the Midea Duo.

It's important to note that we tested and originally wrote this review for the 2019 version of the ARC-14S. The latest version of this model now has a SACC of 9,500 BTUs and a power draw of 1300 watts.

The end result is that both of these ducts radiate heat back into the room as the ARC-14S works hard to cool it. This addition of heat to the room via the unit’s ducting causes the actual cooling capacity to be less than 14,000 BTUs.

The ARC-14S creates these pressure differences as it exhausts air out of the room. Since it’s a dual hose unit it does pull in almost as much air as it exhausts – but not exactly the same amount of air. The unit also pulls in air from the conditioned room through a grille on the back of the unit. All of this amounts to a pressure difference – less of a difference than what a single hose unit would create – but a difference nonetheless.

The most efficient “14,000 BTU” unit, the Midea Duo, has an actual cooling capacity (SACC) of 12,000 BTUs. This is still a substantial drop off but not quite as egregious as that of the Whynter ARC-14S.

Dehumidifier mode pints/day – 101 pints/day Drainage options - manual drainage only (single plug at back bottom) Drain hose – none included

But consider for a moment our discussion earlier regarding claimed BTUs and actual BTUs. We showed how SACC BTUs are much more representative of actual cooling capacity than claimed BTUs.

Yes, it certainly would. Even though the conventional way for calculating energy efficiency – EER – involves using claimed BTUs.

Regular grille and air filter is a little bit wonky but fits together in only one way and wasn't much of an issue to remove/replace.