Mitsubishi Electric M-Series GX Standard Heat Pump 18,000 BTU — Starting at $5,113.68 Installed
The Mitsubishi Electric M-Series GX Standard Heat Pump 18,000 BTU wall-mounted heat pump (MUZ-GX18NL + MSZ-GX18NL) starts at $5,113.68 installed by Sapper HVAC in Phoenix, AZ, including pad, disconnect box with up to 20 ft of electrical, and lineset covers. It carries a 22.5 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 | 18,000 BTUH |
| Heating capacity (@47°F) | 21,600 BTUH |
| Heating capacity at 5°F | 15,200 BTUH |
| SEER2 | 22.5 |
| EER2 | 14.05 |
| HSPF2 | 10.3 |
| AHRI Certified Reference # | 215862736 |
Why This System
The Mitsubishi Electric M-Series GX Standard Heat Pump 18,000 BTU is a wall-mounted ductless system that pairs the MUZ-GX18NL outdoor condenser with the MSZ-GX18NL indoor air handler to deliver both heating and cooling from one compact unit. With a 22.5 SEER2 rating and R454B refrigerant, it's built for efficient, quiet operation in Arizona's desert climate.
In Phoenix Metro homes, an 18,000 BTU system typically covers roughly 650–800 square feet — making it a strong fit for a bonus room, garage, or larger addition. The inverter-driven compressor modulates capacity instead of cycling on and off, which means steadier temperatures and less wear during long summer runtimes. Homeowners choose this system when they need more cooling than a 15,000 BTU unit but still want the simplicity of a single-zone ductless setup.
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 Standard Heat Pump 18,000 BTU system cost installed in Phoenix?
Starting at $5,113.68 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-GX18NL is rated at 21,600 BTUH heating at 47°F and 15,200 BTUH at 5°F.
What size space does a 18,000 BTU Mitsubishi system cover?
General guideline: roughly 650–800 sq ft (bonus room, garage, larger addition). Sapper HVAC confirms sizing at a free on-site estimate.
What refrigerant does this Mitsubishi system use?
The MUZ-GX18NL + MSZ-GX18NL 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 Standard Heat Pump options:
- M-Series GX Standard Heat Pump 9,000 BTU — Starting at $3,462.41 installed
- M-Series GX Standard Heat Pump 12,000 BTU — Starting at $3,844.04 installed
- M-Series GX Standard Heat Pump 15,000 BTU — Starting at $4,377.96 installed
- M-Series GX Standard Heat Pump 24,000 BTU — Starting at $5,900.78 installed
- M-Series GX Standard Heat Pump 30,000 BTU — Starting at $6,640.20 installed
- M-Series GX Standard Heat Pump 36,000 BTU — Starting at $8,161.21 installed
Compare with: M-Series GX Hyper-Heat or FX Hyper-Heat or Daikin AURORA
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