Data through April 2026
Room Air Conditioners · 11 certified models
Keystone
Keystone: 11 ENERGY STAR certified models in this data, running $75 to $255 a year at the U.S. average electricity rate — a median of $113, versus $100 across every certified room air conditioners.
All certified models
| # | Model | kWh/yr | $/yr (US avg) |
|---|---|---|---|
| 1 | Keystone KSTAW081WA | 400 | $75 |
| 2 | Keystone KSTAW08INV | 400 | $75 |
| 3 | Keystone KSTAW08INV-HCmost efficient | 414 | $78 |
| 4 | Keystone KSTAW101WA | 500 | $94 |
| 5 | Keystone KSTAW10INV | 500 | $94 |
| 6 | Keystone KSTAW121WA | 600 | $113 |
| 7 | Keystone KSTAW12INV | 600 | $113 |
| 8 | Keystone KSTAW12INV-HC | 677 | $127 |
| 9 | Keystone KSTAW141WA | 700 | $132 |
| 10 | Keystone KSTAW182WA | 900 | $169 |
| 11 | Keystone KSTAW242WA | 1,353 | $255 |
Other brand facets
Questions, answered with the data
- How much does it cost to run Keystone room air conditioners?
- Among 11 certified models in this data, Keystone room air conditioners cost $75 to $255 a year to run at the U.S. average electricity rate (18.8¢/kWh) — a median of $113.
- Do Keystone room air conditioners cost more or less than the average room air conditioner?
- The median model here runs $113 a year, 13% more than the $100 median across all certified room air conditioners.
- What's the cheapest model among Keystone room air conditioners?
- The Keystone KSTAW081WA costs about $75 a year at the U.S. average rate (400 kWh/yr) — the lowest certified figure in this group.
- What does the certified annual-kWh figure assume for room air conditioners?
- The certified annual kWh assumes 750 cooling hours per year (the DOE standard). In hot climates real usage can run well above that; in mild ones, below.