Pioneer
Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split
A wall-mounted split air conditioner rated at 18,000 BTU for rooms up to 750 sq ft. It heats in winter too.
$1,149
Live price at SylvanePrice checked Sep 24, 2026
Performance
- Cooling capacity
- 18,000 BTU · 5.3 kW
- Heating capacity
- Yes
- Room coverage
- up to 750 sq ft
- Energy Star
- Not published
- SEER2
- Not published
- Annual energy (cooling)
- Not published
Noise, size & features
- Indoor noise
- 55 dB(A)about as loud as a dishwasher
- Outdoor noise
- Not published
- Indoor unit
- 39.75 x 12.38 x 9 in
What is good
- At $1,149 it undercuts 17 of the 19 other 15,000-18,000 BTU mini-splits we list with a live price.
What to watch
- At 55 dB(A) it is louder than 47 of the 60 other mini-splits we list that publish a noise figure.
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 Pioneer Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split
- How loud is the Pioneer Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split?
- 55 dB(A) indoors, about as loud as a dishwasher.
- What size room does the Pioneer Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split cool?
- It is rated to cool a room up to 750 sq ft (18,000 BTU · 5.3 kW).
- Do I need a professional to install the Pioneer Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split?
- Yes. As a single split it needs a certified installer. Usually needs permission.
- Does the Pioneer Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split heat as well as cool?
- Yes. It 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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