MRCOOL · Model DIYS-09-HP-B-115A11-O
DIY Select 9,000 BTU Ductless Mini Split Heat Pump 115V - Black
A wall-mounted split air conditioner rated at 9,000 BTU for rooms up to 400 sq ft. It heats in winter too.
$1,249
Live price at SylvanePrice checked Oct 27, 2026
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Will it cool your room?
This unit's cooling matches a 400 sq ft room. Set your room size to check the fit for your space.
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.
At a glance
Best for larger open-plan rooms.
Performance
- Cooling capacity
- 9,000 BTU · 2.6 kW
- Power while cooling
- About 918 W, about $0.17 an hour
- Heating capacity
- Yes
- Heats down to
- -13°F outdoors
- Room coverage
- up to 400 sq ft
- Energy Star
- Not published
- SEER2
- 17.5
- EER2
- 9.8
- Annual energy (cooling)
- Not published
Noise, size & features
- Model number
- DIYS-09-HP-B-115A11-O
- Indoor noise
- Not published
- Outdoor noise
- Not published
- Indoor unit
- Not published
- Outdoor unit
- 28.35 x 19.49 x 10.63 in (W x H x D)
- Refrigerant
- R-454B
- Wi-Fi / app
- Not published
- Outdoor unit needed
- Yes
- Power supply
- 115 V
- Warranty
- 1-Year Parts Limited Warranty; 2-Year Compressor Limited Warranty
SEER2, EER2, heating limit, supply voltage, refrigerant, outdoor unit size and warranty are from Sylvane's published specifications for this exact configuration, checked Oct 2, 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
- Uses R-454B (GWP 466), the low-GWP class new US residential equipment moved to.
What to watch
- Its SEER2 17.5 is less efficient than 63 of the 73 other mini-splits we list with a published SEER2.
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.
DIY kit, certified refrigerant hookup
R-454B
Common questions about the MRCOOL DIY Select 9,000 BTU Ductless Mini Split Heat Pump 115V - Black
- How energy-efficient is the MRCOOL DIY Select 9,000 BTU Ductless Mini Split Heat Pump 115V - Black?
- Its efficiency rating is SEER2 17.5.
- How many watts does the MRCOOL DIY Select 9,000 BTU Ductless Mini Split Heat Pump 115V - Black use?
- About 918 watts while cooling at full power: its rated 9,000 BTU divided by its EER2 of 9.8, the draw at its rating point (95°F outside). At the US average electricity price that is about $0.17 an hour; once the room is cool the compressor cycles, so most hours cost less.
- What size room does the MRCOOL DIY Select 9,000 BTU Ductless Mini Split Heat Pump 115V - Black cool?
- It is rated to cool a room up to 400 sq ft (9,000 BTU · 2.6 kW).
- Do I need a professional to install the MRCOOL DIY Select 9,000 BTU Ductless Mini Split Heat Pump 115V - Black?
- Partly. MRCOOL sells it as a do-it-yourself kit: the line set comes pre-charged with quick-connect fittings, so there is no vacuum pump or refrigerant charging on site, and you can mount the units and route the lines yourself. But under EPA Section 608 connecting refrigerant lines is certified-technician work, so plan on a certified technician for that connection. Usually needs permission.
- Does the MRCOOL DIY Select 9,000 BTU Ductless Mini Split Heat Pump 115V - Black heat as well as cool?
- Yes. It is a heat pump that also heats.
- How cold can it get outside before the MRCOOL DIY Select 9,000 BTU Ductless Mini Split Heat Pump 115V - Black stops heating?
- Its retailer's specification for this exact configuration rates it to keep heating down to -13°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 MRCOOL 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 MRCOOL DIY 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 heat pump units around 9,000 BTU
Senville
Leto 9,000 BTU Mini Split Heat Pump 115V
A wall-mounted split air conditioner rated at 9,000 BTU for rooms up to 400 sq ft. It heats in winter too.
$739
at Sylvane
Package: 16 ft line set
+ pro install, usually $1,500-4,000
$1,249
In stock. We may earn a commission.