Data through June 2026
Room Air Conditioners · 11 certified models
Keystone
Keystone: 11 ENERGY STAR certified models in this data, running $73 to $248 a year at the U.S. average electricity rate — a median of $110, versus $98 across every certified room air conditioners.
All certified models
| # | Model | kWh/yr | $/yr (US avg) |
|---|---|---|---|
| 1 | Keystone KSTAW081WA | 400 | $73 |
| 2 | Keystone KSTAW08INV | 400 | $73 |
| 3 | Keystone KSTAW08INV-HCmost efficient | 414 | $76 |
| 4 | Keystone KSTAW101WA | 500 | $92 |
| 5 | Keystone KSTAW10INV | 500 | $92 |
| 6 | Keystone KSTAW121WA | 600 | $110 |
| 7 | Keystone KSTAW12INV | 600 | $110 |
| 8 | Keystone KSTAW12INV-HC | 677 | $124 |
| 9 | Keystone KSTAW141WA | 700 | $128 |
| 10 | Keystone KSTAW182WA | 900 | $165 |
| 11 | Keystone KSTAW242WA | 1,353 | $248 |
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 $73 to $248 a year to run at the U.S. average electricity rate (18.3¢/kWh) — a median of $110.
- Do Keystone room air conditioners cost more or less than the average room air conditioner?
- The median model here runs $110 a year, 13% more than the $98 median across all certified room air conditioners.
- What's the cheapest model among Keystone room air conditioners?
- The Keystone KSTAW081WA costs about $73 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.