Quick Answer: Costco sells portable air conditioners from Midea (Duo), Hisense, and Black+Decker, generally priced $180 to $490, with member-only pricing that has occasionally beaten Amazon on the same models. The genuine surprise is the return policy: Costco’s own customer service pages set a 90-day cap on electronics and a separate 90-day cap on major appliances, but portable air conditioners aren’t listed under either exception — meaning they ride on Costco’s famously open-ended satisfaction guarantee instead of a fixed deadline. The catch is access: in-store purchases require a paid membership, and Costco.com charges non-members a 5% surcharge on top of listed prices.
Costco isn’t the first place most people think to shop for a portable air conditioner, but it’s a real option with real brand-name inventory — and a return policy that’s structured differently from every other big-box retailer this site has checked.
What Costco actually stocks
| Brand / Model | BTU (SACC) | Notable spec | Typical Costco price |
|---|---|---|---|
| Midea Duo (12,000 BTU model) | 12,000 SACC | Dual-hose inverter, MShield antimicrobial coating | $349.97-$489.99 |
| Hisense dual-hose inverter | 8,000 SACC | Wi-Fi, rated up to 350 sq ft | ~$349-400 |
| Hisense compact | 6,000 SACC | 2 fan speeds, rated up to 250 sq ft | ~$250-300 |
| Black+Decker smart | 5,100 SACC | App/remote control | ~$180-230 |
That’s a smaller, more rotating lineup than Home Depot or Amazon — Costco doesn’t try to carry every BTU size or every brand this site tracks. What’s there tends to be the same dual-hose inverter designs this site already ranks highly for efficiency, at a member-only price point.
The return-policy surprise
Every other big-box retailer this site has checked carves portable air conditioners out of its standard return window: Home Depot cuts them down to 7 days (the same bucket as dehumidifiers and pressure washers), well short of its usual 90-day policy. Costco does the opposite by omission. Its customer service pages name exactly two categories with a fixed 90-day return cap — electronics (TVs, computers, tablets, cameras, cell phones) and major appliances (refrigerators over 10 cubic feet, washers, dryers, dishwashers, ranges, cooktops, water heaters). Portable air conditioners don’t appear on either list.
| Retailer | Portable AC return window |
|---|---|
| Costco | No fixed deadline — general satisfaction guarantee (not listed as an exception) |
| Home Depot | 7 days (named exception, same as dehumidifiers) |
| Amazon (most name-brand listings) | 30 days standard |
That doesn’t mean Costco will take back a portable AC after years of hard use with no questions asked — the company reserves the right to use judgment on heavily used items — but structurally, there’s no clock running down the way there is at Home Depot. If a heat wave means you don’t get around to testing a unit for two or three weeks, that’s a real practical advantage.
The membership math
Here’s the part that changes the calculation: buying in a Costco warehouse requires an active paid membership at checkout, no exceptions. Costco.com is more flexible — non-members can order the same portable ACs online, but Costco’s own policy confirms a 5% surcharge applies to non-member orders on top of the listed member price. On a $400 Midea Duo, that’s an extra $20, which starts to close the gap with Amazon pricing on the identical model.
If you already have a membership for groceries or gas, the portable AC pricing can genuinely beat Amazon during promotions — the Midea Duo has been seen at $349.97 at Costco against this site’s sitewide Amazon-tracked $450-550 range for the same 12,000 BTU model. If you don’t have a membership and would only buy the AC, the 5% surcharge plus the lack of Prime’s two-day shipping usually tips the math back toward Amazon.
Our picks if you’d rather skip the membership
Midea Duo MAP12S1TBL — Same Model, No Membership Needed
- The identical dual-hose inverter design Costco sells under its own listing, minus the membership requirement or the non-member surcharge.
- Wirecutter's #1-ranked portable AC pick, per this site's Midea buying guide — the inverter compressor keeps its rated cooling far better than the single-hose portables Costco doesn't stock.
Don’t sweat the heat wave — Prime delivers your portable AC in two days. Try it free for 30 days.
Hisense Dual-Hose Portable AC — Best Budget Alternative
- The same brand and BTU class Costco stocks, at a comparable price without needing a membership card to check out.
- Dual-hose venting avoids the negative-pressure loss that cuts into cooling on cheaper single-hose portables — see our dual-hose vs single-hose guide.
How to choose
- Already a Costco member? Check current in-store or online pricing on the Midea Duo and Hisense units before buying elsewhere — the member price has beaten Amazon during promotions, and the return policy has no fixed deadline.
- Not a member and only buying an AC? The 5% Costco.com non-member surcharge plus the lack of Prime shipping usually erases the savings — buy the identical model on Amazon instead.
- Want more BTU sizes or brands than Costco’s rotating lineup covers? See our full portable AC rankings for the complete field, including brands Costco doesn’t carry at all.
- Shopping for a window unit instead? Costco’s window-AC selection is even thinner than its portable lineup — see our Home Depot window AC guide for a retailer that stocks more variety.
The bottom line
Costco’s portable AC selection is smaller than Home Depot’s or Amazon’s, but the brands it does carry — Midea Duo, Hisense, Black+Decker — are legitimate, and the return policy is structurally more forgiving than any other big-box retailer this site has checked, since portable ACs aren’t named as an exception to Costco’s open-ended satisfaction guarantee. The tradeoff is access: you need a paid membership to shop in-store, and a 5% surcharge applies online if you don’t have one. If that math doesn’t work for you, the same Midea Duo and Hisense models are sold on Amazon with Prime shipping and no membership required.