#1 Window Most Efficient
Midea MWCUWH-18CRFN8-MCP0
18,000 BTU · 843.8 kWh/season
27 18,000 BTU Window & Wall Air Conditioners, Ranked by Running Cost
Room air conditioners (window and through-the-wall) with rated cooling capacity 17,000-20,999 BTU/h, sold in the US. Window and through-the-wall units are mixed and tagged below. Ranked cheapest to run first, estimated at 18.31¢/kWh over a 750-hour cooling season (July 2026 rate).
27 ENERGY STAR certified models, from about $154 to $197 a cooling season to run at the US average electricity rate. This assumes 750 hours of cooling a year, ENERGY STAR's test assumption for a typical season — not continuous, year-round use. See how we calculate running costs.
Top 5 cheapest to run
#2 Window Most Efficient
Midea MAW18S2KWT-A
18,000 BTU · 843.8 kWh/season
#3 Window Most Efficient
Midea MAW18RV1KWT
18,000 BTU · 843.8 kWh/season
#4 Window Most Efficient
Brothers 102387
18,000 BTU · 843.8 kWh/season
#5 Window Most Efficient
Seasons SW18V2
18,000 BTU · 843.8 kWh/season
All 27 models
| Rank | Brand | Model | Mount | BTU | Energy use | Est. cost/season |
|---|---|---|---|---|---|---|
| 1 | Midea Most Efficient | MWCUWH-18CRFN8-MCP0 | Window | 18,000 | 843.8 kWh/season | $154 |
| 2 | Midea Most Efficient | MAW18S2KWT-A | Window | 18,000 | 843.8 kWh/season | $154 |
| 3 | Midea Most Efficient | MAW18RV1KWT | Window | 18,000 | 843.8 kWh/season | $154 |
| 4 | Brothers Most Efficient | 102387 | Window | 18,000 | 843.8 kWh/season | $154 |
| 5 | Seasons Most Efficient | SW18V2 | Window | 18,000 | 843.8 kWh/season | $154 |
| 6 | Frigidaire Most Efficient | FHWW185WF2 | Window | 18,000 | 843.8 kWh/season | $154 |
| 7 | Perfect Aire Most Efficient | 1PACV18000 | Window | 18,000 | 843.8 kWh/season | $154 |
| 8 | BLACK+DECKER Most Efficient | BDM18C | Window | 18,000 | 843.8 kWh/season | $154 |
| 9 | Whirlpool Most Efficient | WHAW182INV | Window | 18,000 | 843.8 kWh/season | $154 |
| 10 | Whirlpool Most Efficient | WHHW182INV | Window | 18,000 | 843.8 kWh/season | $154 |
| 11 | Frigidaire | FHWW185WE2 | Window | 18,000 | 900 kWh/season | $165 |
| 12 | Midea | MAW18R2VWT | Window | 18,000 | 900 kWh/season | $165 |
| 13 | Hisense | AW1823TW3W | Window | 18,000 | 900 kWh/season | $165 |
| 14 | Midea | MWCUWH-18CRFN8-MCN10 | Window | 18,000 | 900 kWh/season | $165 |
| 15 | Midea | MAW18S2VWT-A | Window | 18,000 | 900 kWh/season | $165 |
| 16 | Keystone | KSTAW182WA | Window | 18,000 | 900 kWh/season | $165 |
| 17 | Keplerx | KBRC18RSVE2 | Window | 18,000 | 900 kWh/season | $165 |
| 18 | Midea | MAW18RV1CWT | Window | 18,000 | 900 kWh/season | $165 |
| 19 | LG | LW1822IVSM | Window | 18,000 | 918.4 kWh/season | $168 |
| 20 | Friedrich | CCV18A30A | Window | 18,000 | 937.5 kWh/season | $172 |
| 21 | Whirlpool | WHAW-181IN | Window | 18,000 | 937.5 kWh/season | $172 |
| 22 | HEMA | DS-2W1822CI | Window | 18,000 | 937.5 kWh/season | $172 |
| 23 | TCL | H18W4KW | Window | 18,000 | 937.5 kWh/season | $172 |
| 24 | TCL | H18W4KW-CA | Window | 18,000 | 937.5 kWh/season | $172 |
| 25 | TCL | T18WQ2S | Window | 18,000 | 937.5 kWh/season | $172 |
| 26 | Friedrich | KCVM18B30A | Window | 19,100 | 994.8 kWh/season | $182 |
| 27 | Kühl Most Efficient | KCVM18B30B | Window | 20,900 | 1073.6 kWh/season | $197 |