Pioneer · Model WYT018GLSI20RL
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.
$1,138
Live price at SylvanePrice checked Oct 27, 2026
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Price history at Sylvane
Based on 80 prices we have recorded since Jul 25, 2026, not a market average.
Will it cool your room?
This unit's cooling matches your 500 sq ft room.
Mini-splits are rated on SEER2, a seasonal scale, not the ENERGY STAR annual-kWh figure this dollar estimate is built from, so there is no comparable figure to show here. A blank is missing data, not a worse result: a mini-split is often the more efficient choice.
Installation cost
$2,500-6,000 fully installed for a typical room (the equipment is roughly $700-1,800, professional installation roughly $1,500-4,000+ depending on line-set run, electrical and access). The unit price you see here is hardware only; installation is the larger, separate cost.
A typical range for this system type, for comparison only, not a quote for this unit. The actual price depends on the line-set run, electrical work and access.
What each mini-split size costs todayAt a glance
Best for larger open-plan rooms.
Performance
- Cooling capacity
- 18,000 BTU · 5.3 kW
- Power while cooling
- About 1,636 W, about $0.30 an hour
- Heating capacity
- 19,000 BTU
- Heats down to
- -4°F outdoors
- Room coverage
- up to 750 sq ft
- Energy Star
- Not published
- SEER2
- 21
- EER2
- 11
- Annual energy (cooling)
- Not published
Noise, size & features
- Model number
- WYT018GLSI20RL
- 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
- Outdoor unit
- 34 x 23.75 x 13.75 in (W x H x D)
- Refrigerant
- R-454B
- Wi-Fi / app
- Not published
- Outdoor unit needed
- Yes
- Power supply
- 208/230 V
- Warranty
- 5-Year Limited Warranty
SEER2, EER2, heating capacity, heating limit, supply voltage, refrigerant, outdoor unit size and warranty are from Sylvane's published specifications for this exact configuration, checked Oct 27, 2026.
Power while cooling: From its rated cooling capacity divided by its EER2 rating, which is the draw at its rating point (95°F outside). An hour's cost is at that draw and the US average electricity price of 18.44¢/kWh (U.S. Energy Information Administration, Electric Power Monthly Table 5.6.A (residential average, May 2026)). The compressor cycles once the room is cool, so most hours cost less.
What is good
- At $1,138 it undercuts 17 of the 20 other 15,000-18,000 BTU mini-splits we list with a live price.
- Uses R-454B (GWP 466), the low-GWP class new US residential equipment moved to.
What to watch
- At 55 dB(A) it is louder than 46 of the 58 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
R-454B
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.
- How energy-efficient is the Pioneer Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split?
- Its efficiency rating is SEER2 21.
- How many watts does the Pioneer Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split use?
- About 1,636 watts while cooling at full power: its rated 18,000 BTU divided by its EER2 of 11, the draw at its rating point (95°F outside). At the US average electricity price that is about $0.30 an hour; once the room is cool the compressor cycles, so most hours cost less.
- 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, rated 19,000 BTU of heating output.
- How cold can it get outside before the Pioneer Diamante Pro 18,000 BTU High-Wall Series Ductless Mini Split stops heating?
- Its retailer's specification for this exact configuration rates it to keep heating down to -4°F outdoors. That is its operating limit, not its full output: a heat pump delivers less heat as it gets colder, so size it for your coldest days.
How Pioneer compares with other brands
Both lineups at every size both brands sell in stock, with live prices, ratings and the warranty each listing states.
How the Pioneer Diamante line compares
Both lines at every size both sell in stock, with live prices, ratings, recalls and what each maker says about its line.
Is a split even the right type?
Compare splits against the other types on price, noise, efficiency and install.
Buying guides for a single split like this
The questions buyers ask, answered from live prices and real specs. See where a single split like this fits.
More mini split units around 18,000 BTU
Pioneer
Quantum Ultra 18,000 BTU High-Wall Ductless Mini Split
A wall-mounted split air conditioner rated at 18,000 BTU. It heats in winter too.
$1,553
at Sylvane
Package: 16 ft line set
+ pro install, usually $1,500-4,000
$1,138
In stock. We may earn a commission.