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UN0335 109K Views
Apr 1, 2025 5:02 PM

Costco In-Warehouse: Midea U 12,000 BTU Smart Inverter Window Air Conditioner

$280

$380

26% off
(Availability May Vary)at Costco Wholesale
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Deal Details
Costco Wholesale [Deal Reference] has Midea U 12,000 BTU Smart Inverter Window Air Conditioner Unit w/ MShield (White; MAW12AV1QWT-C) on sale for $279.99 valid for in-warehouse purchase for Costco Members only.

Alternatively, if you wish to purchase this unit online, it is available for $299.99. Shipping is free.

Thanks to community member UN0335 for finding this deal

Note, must login to your Costco account w/ an active membership to purchase.

About the Product
  • U-Shaped Groove/Drop-In Install Design
  • 12,000 BTU/32 dBA/1140W
  • 4-Way Air Direction/
  • 5 Cool Setting/4 Fan Speed
  • 550 Sq. Ft. Maximum Coverage Area
  • Energy Star Certified
  • MShieled Air Ionizer Technology
  • Smart Control w/ SmartHome App

Editor's Notes

Written by Discombobulated | Staff
  • About the Deal
    • Product is available for in-warehouse purchase at the reduced/listed price; maximum of $80 Off/discount
    • Easy installation w/ snap in bracket; recommended for areas/spaces up to 550 sq. ft.
    • You may open your window to enjoy fresh air even w/ your AC installed
    • Product Item #2677429 for reference
    • Limit 5 per customer
    • Offer valid through May 4, 2025 or while promotional price/supplies last

Original Post

Written by UN0335
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale [Deal Reference] has Midea U 12,000 BTU Smart Inverter Window Air Conditioner Unit w/ MShield (White; MAW12AV1QWT-C) on sale for $279.99 valid for in-warehouse purchase for Costco Members only.

Alternatively, if you wish to purchase this unit online, it is available for $299.99. Shipping is free.

Thanks to community member UN0335 for finding this deal

Note, must login to your Costco account w/ an active membership to purchase.

About the Product
  • U-Shaped Groove/Drop-In Install Design
  • 12,000 BTU/32 dBA/1140W
  • 4-Way Air Direction/
  • 5 Cool Setting/4 Fan Speed
  • 550 Sq. Ft. Maximum Coverage Area
  • Energy Star Certified
  • MShieled Air Ionizer Technology
  • Smart Control w/ SmartHome App

Editor's Notes

Written by Discombobulated | Staff
  • About the Deal
    • Product is available for in-warehouse purchase at the reduced/listed price; maximum of $80 Off/discount
    • Easy installation w/ snap in bracket; recommended for areas/spaces up to 550 sq. ft.
    • You may open your window to enjoy fresh air even w/ your AC installed
    • Product Item #2677429 for reference
    • Limit 5 per customer
    • Offer valid through May 4, 2025 or while promotional price/supplies last

Original Post

Written by UN0335

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Top Comments

SkyeC
710Comments
162Reputation
No comment on these specific units but if you're having problems with mold on any AC, you should just turn it to fan mode for 20m or so before shutting off.

All AC's work by transferring heat from one side of the unit to the other side, as part of this process the coils on the inside of the room will be ice cold (so they can absorb the heat in the room and move it to the outside) moisture will condense on the cold coils, it will then drip down in the pan and be directed outside, that's why AC's always dribble water on the outside.

If you shut the unit off there will be a lot of moisture, all over the coils and in the pan. That moisture be food for mold in the right climates..

To avoid this, run it on the fan mode before turning it off, this will dry the unit out and avoid the mold issues
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BENJAMINB1246
296Comments
68Reputation
You do lose efficiency doing that. Most, if not all, are designed to hold a certain level/amount of water. They do this intentionally so the outdoor fan will "spray" the water on the outdoor coils, which helps with efficiency by cooling them down.
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nerds
367Comments
70Reputation
The way to avoid mold is never turn it off without running the fan a while AND never use the default energy save mode... because that turns off the fan *every time* they compressor turns off at the same time, leaving all the moisture everywhere. Leave it on auto or a specific fan speed and turn off emergy save mode always whenever use the AC. Because when it sits right after the compressor turns off, that's when all the moisture accumulates everywhere. Energy save node = grow mold inside AC.
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241 Comments

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Apr 1, 2025 10:41 PM
483 Comments
Joined Jul 2010
BLKCLDApr 1, 2025 10:41 PM
483 Comments
Quote from jayreezy View quoted comment :
Does anyone know if the 8000 btu ones ever go on sale as well?
Yes I believe they were last year for about $50 less. $229 I think it was.
Apr 1, 2025 10:47 PM
425 Comments
Joined May 2009
TheUrbanViewApr 1, 2025 10:47 PM
425 Comments
Quote from Musicaholic8000 View quoted comment :
Read some reviews. People still complain of mold and it's not the easiest to disassemble. Real pain to clean the blower wheel as it's like 2ft long.https://youtu.be/esPGXI-nVjI?si=LiFYHgfSkE__Ix-4
If you drill a couple of small weep holes in the back bottom of the case the water will drain out better and you won't have as bad of a mold issue.
Apr 1, 2025 10:52 PM
630 Comments
Joined Jan 2015
bookertttApr 1, 2025 10:52 PM
630 Comments
Have the 8k for years and it's been good. Installation in the first year was challenging.

Tip: if your sill plate has a decent slant, cut a 2x4 window width and put in on the sill and then go thru regular install directions. Also, cut pool noodles make for good extra insulation.
Apr 1, 2025 10:56 PM
135 Comments
Joined Sep 2013
erice2336Apr 1, 2025 10:56 PM
135 Comments
I'm waiting for the midea 12k heat pump window ac that has a heater. Costco had it a few years ago but it never came back. We only have horizontal siding windows.
Apr 1, 2025 11:03 PM
496 Comments
Joined Aug 2010
robsnyder22Apr 1, 2025 11:03 PM
496 Comments

Our community has rated this post as helpful. If you agree, why not thank

Quote from Musicaholic8000 View quoted comment :
Read some reviews. People still complain of mold and it's not the easiest to disassemble. Real pain to clean the blower wheel as it's like 2ft long.https://youtu.be/esPGXI-nVjI?si=LiFYHgfSkE__Ix-4
YMMV, I just spray it all down with coil cleaner, blower wheel and all, spray it with a brand new clean water pump up sprayer after 10 minutes and put a fan on it to dry everything out thoroughly. I use mine in Florida continuously. Way easier than disassembling everything. I maintain 4 of them doing this exact technique. I should do a youtube video of me doing mine, but I am sure it could potentially break the unit one day. So far, 12-15 cleanings later, their all going strong, and clean too.
BTW: This air conditioner 12k uses nearly the same amount of energy as the 8k and idles down to 95W or so when cooling minimally. The 8K Idled back about the same cooling minimally. The main difference is that the 12K can ramp up to using 780W or so while the 8K maxed out at like 460W.
3
Apr 1, 2025 11:04 PM
23 Comments
Joined Jan 2014
MichaelM4110Apr 1, 2025 11:04 PM
23 Comments
Quote from ejordan525 View quoted comment :
I can attribute to the mold issue. Mine lasted two seasons, but I didn't realize I'd have to maintain it other than cleaning the filter, etc. I just bought the newer 8k model with Matter connectivity since I believe the 12k was oversized for my bedroom (got it on sale 2 years ago at Costco). Once I get the 12k swapped out with the 8k, I'm going to try and disassemble the 12k, clean it, and move it to the garage for use.
Oversize doesn't do much on inverter ac, just run it on a lower fan speed so it will dehumidify more
Apr 1, 2025 11:07 PM
652 Comments
Joined Nov 2013
professorxavierApr 1, 2025 11:07 PM
652 Comments
Does this work on horizontal windows?

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Apr 1, 2025 11:18 PM
257 Comments
Joined Sep 2015
dapperdeals55Apr 1, 2025 11:18 PM
257 Comments
Quote from robsnyder22 View quoted comment :
YMMV, I just spray it all down with coil cleaner, blower wheel and all, spray it with a brand new clean water pump up sprayer after 10 minutes and put a fan on it to dry everything out thoroughly. I use mine in Florida continuously. Way easier than disassembling everything. I maintain 4 of them doing this exact technique. I should do a youtube video of me doing mine, but I am sure it could potentially break the unit one day. So far, 12-15 cleanings later, their all going strong, and clean too.
BTW: This air conditioner 12k uses nearly the same amount of energy as the 8k and idles down to 95W or so when cooling minimally. The 8K Idled back about the same cooling minimally. The main difference is that the 12K can ramp up to using 780W or so while the 8K maxed out at like 460W.
The 12k BTU's peak is listed as 1140w. Where is the 780w figure from?
Apr 1, 2025 11:28 PM
697 Comments
Joined Nov 2013
WidowmakerApr 1, 2025 11:28 PM
697 Comments
Quote from erice2336 View quoted comment :
I'm waiting for the midea 12k heat pump window ac that has a heater. Costco had it a few years ago but it never came back. We only have horizontal siding windows.
I don't think they make the model with the heat pump anymore but I could be wrong. I have one that I bought a few years ago. I like it, it works very well.
Apr 1, 2025 11:35 PM
496 Comments
Joined Aug 2010
robsnyder22Apr 1, 2025 11:35 PM
496 Comments
Quote from dapperdeals55 View quoted comment :
The 12k BTU's peak is listed as 1140w. Where is the 780w figure from?
Thats what I get off my Kill a Watt electrical meter.
Apr 1, 2025 11:37 PM
257 Comments
Joined Sep 2015
dapperdeals55Apr 1, 2025 11:37 PM
257 Comments
Quote from robsnyder22 View quoted comment :
Thats what I get off my Kill a Watt electrical meter.
Nice! Does it ever hit wattages higher than that, even when maxed or at startup?
Apr 1, 2025 11:48 PM
6.9K Comments
Joined Dec 2004
CaleoApr 1, 2025 11:48 PM
6.9K Comments
Quote from Ps3Rules View quoted comment :
Bought a couple years ago. It's a great AC, super quiet…. But yeah, VERY hard to clean the fan. It gets really dirty in there and yet they made it almost impossible to access it. My fan got so clogged up, airflow was barely getting thru. Would be a perfect AC if they'd only make it easier to clean that fan.
Quote from ThirstyCruz View quoted comment :
This will be 4th season, and I simply maintain clean filter and been fine. What environment are you using it in that the blower fan is becoming that dirty so much so it reduces airflow?
Excess humidity (indoor and out) can do it alone, but so can things like turning it off right after cooling aggressively and just leaving it (which often traps more moisture inside than is ideal, especially on the coils). Setting a really low manual fan speed can often cause extra moisture to build up.
Quote from professorxavier View quoted comment :
Does this work on horizontal windows?
They can be made to, since they basically just sit on their sill-based stand, but you'll have to make a good-fitting fill panel to take up the open space.
Quote from dapperdeals55 View quoted comment :
The 12k BTU's peak is listed as 1140w. Where is the 780w figure from?
They can vary quite a lot in real-world use depending how hot it is outside, if it's not too terribly hot they might only use 450-600W on 'max' cooling. That's where I typically saw mine operate. Sometimes up in the 1000W range on a hot 95-100f+ day.
Apr 2, 2025 12:23 AM
43 Comments
Joined Nov 2015
DukeWoolworthApr 2, 2025 12:23 AM
43 Comments
The best, most efficient and quietest air conditioner on the market. Heavy sumbitch, too (64#), and setting up the bracket an hour's work first time. I have three, now to be their third year. Great price, unchanged. Our Costco had plenty. Sale lasted for weeks.
Apr 2, 2025 12:49 AM
1K Comments
Joined Aug 2009
mroxerApr 2, 2025 12:49 AM
1K Comments
Have this one, not sure if mine is faulty, but flies gets in through the AC and into my house, took a month to figure out why there are so many flies. Did this happen to anyone?

Gaps are also sealed, literally can see the flies from outside coming out of the AC.

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Apr 2, 2025 12:53 AM
1.3K Comments
Joined Dec 2007
WEVUDOApr 2, 2025 12:53 AM
1.3K Comments
Quote from mroxer View quoted comment :
Have this one, not sure if mine is faulty, but flies gets in through the AC and into my house, took a month to figure out why there are so many flies. Did this happen to anyone?

Gaps are also sealed, literally can see the flies from outside coming out of the AC.
I think you got a bad unit

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