Mitsubishi
HX Series 12,000 BTU Ductless Mini Split Heat Pump
A wall-mounted split air conditioner rated at 12,000 BTU for rooms up to 550 sq ft. It heats in winter too.
$1,979
Live price at SylvanePrice checked Sep 24, 2026
Performance
- Cooling capacity
- 12,000 BTU · 3.5 kW
- Heating capacity
- Yes
- Room coverage
- up to 550 sq ft
- Energy Star
- Not published
- SEER2
- Not published
- Annual energy (cooling)
- Not published
Noise, size & features
- Indoor noise
- 51 dB(A)about as loud as a refrigerator
- Outdoor noise
- Not published
- Indoor unit
- 33 x 11.03 x 9.25 in
What to watch
- At $1,979 it costs more than 17 of the 17 other 12,000-14,000 BTU mini-splits we list with a live price.
Installation & the rules that apply
This is a single split. This is where regulation bites. Under EPA Section 608 the refrigerant circuit may only be opened by a certified technician, and the EPA is explicit that this includes connecting or disconnecting the pre-charged line sets sold with "DIY" mini-split kits. No federal law stops you doing the mounting, bracketing and line routing yourself, but handling the refrigerant without certification voids the warranty and is a violation. Most US jurisdictions also require permits for a new outdoor unit: typically mechanical or building for the wall penetration and mount, plus electrical for the dedicated 240 V circuit and disconnect. An HOA nearly always has to approve exterior equipment in advance, and local noise ordinances can cap how loud the condenser may be at the property line. This varies by city and county, so confirm with your building department before buying hardware.
Certified installer
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Common questions about the Mitsubishi HX Series 12,000 BTU Ductless Mini Split Heat Pump
- How loud is the Mitsubishi HX Series 12,000 BTU Ductless Mini Split Heat Pump?
- 51 dB(A) indoors, about as loud as a refrigerator.
- What size room does the Mitsubishi HX Series 12,000 BTU Ductless Mini Split Heat Pump cool?
- It is rated to cool a room up to 550 sq ft (12,000 BTU · 3.5 kW).
- Do I need a professional to install the Mitsubishi HX Series 12,000 BTU Ductless Mini Split Heat Pump?
- Yes. As a single split it needs a certified installer. Usually needs permission.
- Does the Mitsubishi HX Series 12,000 BTU Ductless Mini Split Heat Pump heat as well as cool?
- Yes. It is a heat pump that also heats.
Is a split even the right type?
Compare splits against the other types on price, noise, efficiency and install.
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