Mitsubishi Electric MSZ-FX / MUZ-FXNLHZ (FX-Series Hyper-Heat, R-454B — new low-GWP) — specs
Full specifications for the Mitsubishi Electric MSZ-FX / MUZ-FXNLHZ (FX-Series Hyper-Heat, R-454B — new low-GWP). Values are manufacturer- or AHRI-retailer-sourced and cited below; anything unpublished shows as "Not published" rather than guessed. Where a figure is nominal or line-level, we say so inline.
| Capacity (BTU) | 9k–18k (18k model verified) |
|---|---|
| SEER2 (cooling efficiency) | Up to 25.5 (18k) |
| HSPF2 (heating efficiency) | Not published |
| Refrigerant | R-454B (Mitsubishi's 2025 low-GWP transition line) |
| Cold-climate rating | Hyper-Heat cold-climate rated; exact min temp for this model not verified (likely -13°F class — unverified) |
| Installation | PRO install (EPA-608; contractor) |
| Zones | single-zone |
| Warranty | PRO/Diamond terms (not verified this session) |
Price: not shown. Premium brands (Mitsubishi, Daikin, Fujitsu, LG) don't publish MSRP — they sell through contractors — and online-direct prices vary by retailer/promo. We don't quote a price we can't verify; check a retailer or get an installed quote.
Data confidence: HIGH on refrigerant + 18k SEER2; LOW/unknown on HSPF2, exact cold limit, warranty, price
Source: manufacturer / retailer spec sheet. Verify SEER2/HSPF2/capacity per exact SKU on the AHRI Directory.
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