Keystone portable air conditioners
4 Keystone model numbers are certified to the U.S. Department of Energy, in 4 rating profiles. The most efficient is the KSTAP10PINV at 14.7 CEER and 10,000 BTU of real cooling. The median Keystone unit is rated 14.2 CEER; the median for all portable units is 7.3.
Keystone also has heat pumps and window air conditioners on this site.
Units with identical ratings are also certified under Midea, Whynter, TOSHIBA, Cooper&Hunter, Element, LG, GE, BLACK+DECKER and 62 other brands.
Keystone models, ranked by CEER
| # | Keystone model numbers | BTU (SACC) | CEER | Per year | Features |
|---|---|---|---|---|---|
| 1 | KSTAP10PINV | 10,000 | 14.7 | $92 | Dual-hose, Inverter |
| 2 | KSTAP121HINV | 12,000 | 14.2 | $114 | Dual-hose, Heat, Inverter |
| 3 | KSTAP12PINV | 12,000 | 13.8 | $118 | Dual-hose, Inverter |
| 4 | KSTAP051PA | 5,000 | 6.2 | $109 | Single-hose |
Each row is one rating profile: all Keystone model numbers certified at the same capacity, efficiency, hose design, heating, drain type and compressor. Yearly cost at 750 hours and 18.0¢/kWh. Size by SACC, the cooling the unit really delivers: how it differs from the box.
About Keystone portable units
Sizes
- 5,000 BTU and under1 models · best 6.2 CEER
- 10,000 BTU1 models · best 14.7 CEER
- 12,000 BTU and up2 models · best 14.2 CEER
Features
- Dual-hose3 of 4 model numbers
- Also heat1 of 4
- Inverter compressor3 of 4
Questions
- Which Keystone portable air conditioner is the most efficient?
- By certified CEER, the KSTAP10PINV (14.7 CEER, 10,000 BTU of real cooling, two hoses). Efficiency can only be compared between units that cool about the same, so check the size class too.
- How efficient are Keystone portable air conditioners?
- The median certified Keystone model number is rated 14.2 CEER, against 7.3 for all certified portable units. 3 of its 4 model numbers have two hoses, which is the main reason one brand's average beats another's. The data measures efficiency and cooling; it says nothing about noise or reliability.
- What sizes do Keystone portable air conditioners come in?
- Real cooling (SACC) from 5,000 to 12,000 BTU across 3 size classes: 5,000 BTU and under, 10,000 BTU, 12,000 BTU and up. The BTU printed on a Keystone box is usually higher than its SACC, so size your room by the SACC in the table.
- Are Keystone portable air conditioners the same as other brands?
- Some are, as far as the data goes. 70 other brands have model numbers certified at exactly the same ratings as Keystone units, including Midea, Whynter, TOSHIBA, Cooper&Hunter, Element. Identical ratings often mean the same factory, though the DOE data has no dimensions to confirm it.