Midea KJ250G-Z42: CADR, room size and running cost
Smoke CADR 146 cfm · Room size 226 sq ft (ENERGY STAR) · 131 kWh/yr ≈ $23.99/yr electricity (estimate)
Certified specs
| Smoke CADR | 146 cfm |
|---|---|
| Dust CADR | 148 cfm |
| Pollen CADR | 143 cfm |
| PM2.5 CADR | 147 cfm |
| ENERGY STAR effective room size | 226 sq ft (1.55 × smoke CADR, per 10 CFR 429.68) |
| Annual energy use | 131 kWh/yr |
| Integrated energy factor | 6.6 cfm/W |
| Smoke CADR per watt | 6.61 cfm/W |
| Ozone emissions (reported) | 1 ppb |
| Technology | Fan and Filter |
| Filter types listed | HEPA-Type |
| Automatic mode | None |
| Connected (app/Wi-Fi) | No |
| ENERGY STAR Most Efficient | Yes |
| Markets | United States, Canada |
| Date certified | 2021-12-16 |
| ENERGY STAR partner | GD Midea Environment Appliances MFG Co., Ltd. |
| Source | ENERGY STAR record 4439571 · Product Finder page |
How many air changes per hour would it give?
Estimate: air changes per hour (ACH) = smoke CADR × 60 ÷ room volume, at the top fan speed used for the CADR test. Real-world ACH is usually lower (lower fan speeds, furniture, filter loading).
| Room | ACH, 8 ft ceiling | ACH, 9 ft ceiling | AHAM sizing |
|---|---|---|---|
| 100 sq ft | 10.9 | 9.7 | Meets AHAM 2/3 rule |
| 150 sq ft | 7.3 | 6.5 | Meets AHAM 2/3 rule |
| 200 sq ft | 5.5 | 4.9 | Meets AHAM 2/3 rule |
| 300 sq ft | 3.6 | 3.2 | Below AHAM 2/3 rule |
| 400 sq ft | 2.7 | 2.4 | Below AHAM 2/3 rule |
| 500 sq ft | 2.2 | 1.9 | Below AHAM 2/3 rule |
| 700 sq ft | 1.6 | 1.4 | Below AHAM 2/3 rule |
AHAM's 2/3 rule: choose a smoke CADR of at least 2/3 of the room's area (8 ft ceiling). By that rule this model suits rooms up to about 219 sq ft.
Estimated yearly electricity cost
| Where | Residential rate | Per year | Per month |
|---|---|---|---|
| Louisiana | 12.72¢ | $16.66 | $1.39 |
| U.S. average | 18.31¢ | $23.99 | $2.00 |
| California | 33.61¢ | $44.03 | $3.67 |
| Hawaii | 48.00¢ | $62.88 | $5.24 |
Estimate = 131 kWh/yr × rate. Rates: EIA Table 5.6.A, July 2026 (preliminary). Filter replacement cost is not included (data gap: not in ENERGY STAR data). Use your own rate and hours.
On battery during an outage (estimate): 131 kWh ÷ 5,840 active hours ≈ 22 W average, which runs slightly high because the annual figure includes standby. A 1,024 Wh portable power station at an assumed 85% inverter efficiency would run it about 39 h. Top fan speed can draw more. Try other stations in the runtime calculator on our power station site.
Similar CADR from other brands
| Model | Smoke CADR (cfm) | ENERGY STAR room size (sq ft) | Energy use (kWh/yr) | Est. electricity/yr* |
|---|---|---|---|---|
| Blueair 3132111100 | 153 | 237 | 103.3 | $18.91 |
| Blueair 3232111101 | 147 | 228 | 108 | $19.77 |
| Blueair 3232111100 | 145 | 225 | 110 | $20.14 |
| Blueair 4512311000 | 161 | 250 | 110 | $20.14 |
| Bosch Air 4000 | 156 | 242 | 124 | $22.70 |
| Cuckoo CAC-AB0610FI | 149 | 231 | 126 | $23.07 |
| Dreame CVM10B | 137 | 212 | 128 | $23.44 |
| Clorox TYPE AP32 | 148 | 229 | 132 | $24.17 |
*Estimate: ENERGY STAR annual kWh × U.S. average residential rate 18.31¢/kWh (EIA, July 2026 (preliminary)). ENERGY STAR's annual figure assumes 16 hours/day of operation under the DOE test procedure.
Compare this model side by side with any other · All Midea models
See Midea air purifiers on the manufacturer's site (plain link, not an affiliate link)
We have not tested this product. Figures are as listed in ENERGY STAR data retrieved 2026-10-17.