Mitsubishi Electric M-Series GX Hyper-Heat 12,000 BTU — Starting at $4,190.81 Installed
The Mitsubishi Electric M-Series GX Hyper-Heat 12,000 BTU wall-mounted hyper-heat system (MUZ-GX12NLHZ + MSZ-GX12NL) starts at $4,190.81 installed by Sapper HVAC in Phoenix, AZ, including pad, disconnect box with up to 20 ft of electrical, and lineset covers. It carries a 25.6 SEER2 rating using R454B refrigerant.
Installed Starting Price
What's included in the starting price:
- Mitsubishi Electric outdoor unit
- Matching Mitsubishi Electric indoor unit
- Outdoor mounting pad
- Disconnect box with up to 20 ft of electrical in ½" EMT conduit
- Lineset covers
- Standard condensate drain routing
- System startup and commissioning
- Customer walkthrough
Installed starting price includes equipment, mounting pad, disconnect box with up to 20 ft of electrical in 1/2-inch EMT conduit, and lineset covers. Sales tax not included on estimate — added on invoice after acceptance.
Installed starting prices are subject to change based on electrical distance, line set length, routing, condensate pump needs, wall brackets, special access, HOA requirements, equipment availability, and site-specific conditions. Final price confirmed after on-site evaluation.
Full Specifications
| Refrigerant | R454B |
| Cooling capacity | 12,000 BTUH |
| Note | Full heat pump specifications at mitsubishicomfort.com/products — confirm at estimate. |
| SEER2 | 25.6 |
| EER2 | 13.35 |
| AHRI Certified Reference # | 216626288 |
Why This System
The Mitsubishi Electric M-Series GX Hyper-Heat 12,000 BTU is a wall-mounted ductless hyper-heat system that pairs the MUZ-GX12NLHZ outdoor condenser with the MSZ-GX12NL indoor air handler. As part of Mitsubishi Electric's GX Hyper-Heat line, it delivers reliable heating even at low outdoor temperatures — a feature that matters on those rare but bitter cold desert nights. With a 25.6 SEER2 rating and R454B refrigerant, it's one of the most efficient single-zone systems Mitsubishi makes.
In Phoenix Metro homes, a 12,000 BTU system typically covers roughly 450–550 square feet — making it a strong fit for a large bedroom, living room, or home office. The inverter-driven compressor modulates capacity instead of cycling on and off, maintaining steady comfort with minimal noise. Homeowners choose this system when they want premium efficiency and hyper-heat capability at a slightly lower price point than the FX Hyper-Heat line.
Sapper HVAC is veteran-owned, ROC #360142 licensed, and insured — every Mitsubishi installation starts with an on-site sizing review so the system fits the space, not just the budget.
Warranty
Mitsubishi Electric standard residential warranty terms apply to this model. Sapper HVAC provides a 2-year labor warranty on all installations.
Confirm full warranty details at mitsubishicomfort.com or at your estimate.
FAQ
How much does the Mitsubishi M-Series GX Hyper-Heat 12,000 BTU system cost installed in Phoenix?
Starting at $4,190.81 installed. That includes the outdoor and indoor units, mounting pad, disconnect box with up to 20 ft of electrical in 1/2-inch EMT conduit, and lineset covers. Sales tax is added on the invoice. Final price confirmed after a Sapper HVAC site visit.
Does this system heat as well as cool?
Yes — the MUZ-GX12NLHZ is a hyper-heat unit rated for heating at low ambient temperatures. Full heat specifications at mitsubishicomfort.com/products.
What size space does a 12,000 BTU Mitsubishi system cover?
General guideline: roughly 450–550 sq ft. Sapper HVAC confirms sizing at a free on-site estimate.
What refrigerant does this Mitsubishi system use?
The MUZ-GX12NLHZ + MSZ-GX12NL uses R454B refrigerant, a reduced-GWP HFC refrigerant adopted as part of Mitsubishi Electric's transition from older R-410A systems.
Other M-Series GX Hyper-Heat options:
Compare with: M-Series GX Standard or FX Hyper-Heat
Ready to Install This Mitsubishi Electric System?
Sapper HVAC confirms sizing, reviews the electrical route, and provides a clear installed price for your Phoenix Metro home.
Sapper HVAC · Veteran-Owned · ROC #360142 · SapperHVAC.com · 0% APR financing for 12 months on approved credit