Mitsubishi Electric M-Series GX Cooling Only 9,000 BTU — Starting at $3,047.76 Installed
The Mitsubishi Electric M-Series GX Cooling Only 9,000 BTU cooling-only wall-mounted system (MUY-GX09NL + MSY-GX09NL) starts at $3,047.76 installed by Sapper HVAC in Phoenix, AZ, including pad, disconnect box with up to 20 ft of electrical, and lineset covers. It carries a 28.4 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 | 9,000 BTUH |
| System type | Cooling only — no heating capability |
| SEER2 | 28.4 |
| EER2 | 15.4 |
| AHRI Certified Reference # | 216508978 |
Why This System
The Mitsubishi Electric M-Series GX Cooling Only 9,000 BTU is a high-efficiency, cooling-only ductless wall-mounted system pairing the MUY-GX09NL outdoor condenser with the MSY-GX09NL indoor air handler. Designed for warm climates where heating is not required, it delivers exceptional efficiency with a 28.4 SEER2 rating and uses R454B refrigerant. The inverter-driven compressor modulates output to match the cooling load for quiet, steady comfort.
In Phoenix Metro homes, a 9,000 BTU cooling-only system typically covers roughly 300–450 sq ft — ideal for a bedroom, home office, or small casita. Because there is no heating capability, this unit is best for spaces that only need cooling, or that already have separate heat.
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 Cooling Only 9,000 BTU system cost installed in Phoenix?
Starting at $3,047.76 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 provide heating?
No — this is a cooling-only system. Sapper HVAC installs Mitsubishi M-Series GX heat pump options if both heating and cooling are needed.
What size space does a 9,000 BTU Mitsubishi system cover?
General guideline: roughly 300–450 sq ft (bedroom, home office, small casita). Sapper HVAC confirms sizing at a free on-site estimate.
What refrigerant does this Mitsubishi system use?
The MUY-GX09NL + MSY-GX09NL 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 Cooling Only options:
- M-Series GX Cooling Only 12,000 BTU — Starting at $3,233.06 installed
- M-Series GX Cooling Only 15,000 BTU — Starting at $3,845.86 installed
- M-Series GX Cooling Only 18,000 BTU — Starting at $4,401.80 installed
- M-Series GX Cooling Only 24,000 BTU — Starting at $5,190.74 installed
- M-Series GX Cooling Only 30,000 BTU — Starting at $6,007.22 installed
- M-Series GX Cooling Only 36,000 BTU — Starting at $7,196.13 installed
Compare with: M-Series GX Heat Pump or Daikin OTERRA Cooling Only
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