Fujitsu Altair 500 24,000 BTU
#9 in 24,000 BTUFull review
Fujitsu’s mainstream line for cooling and mild-winter heating, with a 10-year registered warranty. It stops heating below 5 °F.
3.5/5
Mitsubishi’s standard line, quiet and efficient, for milder winters: it loses a good share of its heat in deep cold and stops heating at −5 °F.
- 24,000 BTUSize
- 19,400 Btu/hHeat at 5 °F
- 70%Kept at 5 °F
- 10.3 / 21.5HSPF2 / SEER2
- Pro installInstall
See it at Mitsubishi
No store we check sells it online; the maker lists where to buy or who installs it.
Pros
- 10-year parts and compressor warranty once registered
- Line set can run up to 100 ft, so the outdoor unit can sit well away from the room
Cons
- Keeps heating only down to −5 °F
- Needs a licensed HVAC installer: a self-install voids the warranty
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Capacity (certified) | |
|---|---|
| Size (nominal) | 24,000 BTU |
| Cooling at 95 °F | 22,400 Btu/h |
| Heating at 47 °F | 27,600 Btu/h |
| Heating at 17 °F (max) | 24,600 Btu/h |
| Heating at 5 °F (max) | 19,400 Btu/h |
| Heat kept at 5 °F | 70% |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 10.3 |
| SEER2 | 21.5 |
| EER2 | 13 |
| COP at 5 °F | 1.80 |
| ENERGY STAR | ENERGY STAR Cold Climate |
| AHRI certificate | 215862737 |
| Operating range | |
| Heats down to | -5 °F |
| Cooling range | 14 to 115 °F |
| Installation | |
| Installed by | Professional (sold through installers) |
| Line set connection | Flare fittings (vacuum pump needed) |
| Line set | up to 100 ft |
| Voltage | 230 V |
| Refrigerant | R-454B |
| Indoor unit | MSZ-GX24NL |
| Outdoor unit | MUZ-GX24NL |
| Build | |
| Indoor noise | 30–53 dB(A) |
| Outdoor noise | 55 dB(A) |
| Wi-Fi | Built in |
| Weight | indoor 37 lb / outdoor 116 lb |
| Warranty | 10 yr compressor, 10 yr parts |
| Warranty with DIY install | No, a licensed installer is required |
| Released | 2025-02 |
Alternatives in this size
MrCool DIY 5th Gen 24,000 BTU 230V
#10 in 24,000 BTUFull review
For someone who wants a true plug-together install with no tools beyond a drill, and a warranty that survives it. Expect to pay well over the price of a flare unit with the same cold-weather output.
Amazon MRCOOL DIY Direct $3,335$3,335
Perfect Aire Quick Connect 24,000 BTU 230V
#12 in 24,000 BTUFull review
A quick-connect unit with one of the longest warranties for a self-install, priced below MrCool’s DIY 5th Gen. Its −4 °F heating limit rules it out as the only heat in a very cold climate.
Amazon $2,025.45$2,025.45
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