MRCOOL DIY Select 12K BTU Ductless Mini Split System with Black Wall Mount Air Handler, 115V, 11.5 Ft DIY Lineset, R454B (DIYS-12-HP-B-115A11-O)

MRCOOLSKU: DIYS-12-HP-B-115A11-O
47 reviews

Price:
Sale price$1,399.00 Regular price$1,819.00SAVE 23%
Backorder
Estimated restock: Estimated Ship Date: Late August
Free Curbside Delivery — carrier calls to schedule

Free Curbside Delivery

Included on every order
Ships free by freight carrier. Your order leaves the warehouse tracked, on a palletized freight truck.
The carrier calls ahead. You'll schedule a delivery window that works for you before the truck heads out.
Delivered to the curb. The item is placed at the end of your driveway. Moving it inside is your responsibility, so plan to have help on hand for heavy pieces.
Before you sign: inspect the packaging for damage. Signing the delivery receipt confirms it arrived in good condition.
In-Home Protection Plan
Home Outlet Direct + CPS

Add an Extended Protection Plan by CPS and Enjoy Peace of Mind!

Protection Plan Benefits:
  • Covers 100% parts and labor for product defects in materials and workmanship
  • Replacement of product if it cannot be repaired
  • No deductibles
  • Protection from dust, heat and internal humidity damage
  • Damage caused by power surges
  • In-home service
Full Coverage Details
No deductibles
International coverage
Easy claims process

Description

The MRCOOL® DIY® Select 12,000 BTU 115V Ductless Mini-Split Heat Pump System in a sleek matte black finish delivers powerful, energy-efficient heating and cooling for spaces up to 550 square feet, with a 17.5 SEER2 cooling rating and 9.0 HSPF2-4 heating efficiency. Built for true do-it-yourself installation, this complete system pairs the DIYS-12-HP-C-115A11-O outdoor condenser with the DIYS-12-HP-B-WMAH-115A13-O indoor air handler and includes a factory pre-charged 11.5-foot Quick Connect® line set with environmentally friendly R-454B refrigerant — no vacuum pumps, gauges, or HVAC experience required. Smart Wi-Fi control via the MRCOOL® Comfort app, Amazon Alexa and Google Assistant compatibility, Gold Fin® corrosion-resistant coating, and a 2-year compressor / 1-year parts warranty round out a reliable, year-round comfort solution.

Key Features

  • Complete DIY® Mini-Split System: Includes the DIYS-12-HP-C-115A11-O outdoor condenser and DIYS-12-HP-B-WMAH-115A13-O indoor wall-mounted air handler — everything needed for single-zone comfort
  • Powerful Heating & Cooling: 12,000 BTU capacity efficiently conditions spaces up to 550 square feet
  • High-Efficiency Performance: 17.5 SEER2 cooling and 9.0 HSPF2-4 heating ratings for year-round energy savings
  • True DIY® Installation: No specialized tools, HVAC certifications, or prior experience required
  • Pre-Charged Quick Connect® Line Set: 11.5-foot line set factory pre-charged with R-454B refrigerant — no vacuum pump or refrigerant handling needed
  • Eco-Friendly R-454B Refrigerant: Lower global warming potential for environmentally responsible operation
  • 13-Foot DIYPRO® Cable: Replaces traditional electrical conduit while protecting wiring from moisture, pests, and outdoor exposure
  • 115V Power Supply: 1-ton system designed for 115V/60Hz single-phase operation
  • Smart Wi-Fi Control: MRCOOL® Comfort app enables remote temperature control, scheduling, and energy monitoring from anywhere
  • Voice Assistant Compatible: Works with Amazon Alexa and Google Assistant for hands-free control
  • Wireless Remote Included: Convenient on-the-spot adjustments without reaching for your phone
  • Advanced Comfort Modes: Sleep Mode, Dry Mode, Auto Mode, and Fan-Only Mode for tailored indoor comfort
  • Programmable Scheduling: Set custom on/off and temperature schedules to maximize efficiency
  • Gold Fin® Condenser Coating: Enhanced corrosion resistance for durability in humid or coastal environments
  • Inverter Technology: Variable-speed compressor for stable temperatures and reduced energy consumption
  • Reusable Air Filter: Washable filter design reduces ongoing maintenance costs
  • Matte Black Finish: Sleek, modern design that blends seamlessly into a wide range of interior styles
  • Backed by Warranty: 2-year compressor warranty and 1-year parts warranty for added peace of mind
DIMENSIONS & WEIGHT
Condenser Dimensions
28.35 W" x 10.63 D" x 19.49 H"
Air Handler Dimensions
31.57 W" x 7.87 D" x 11.61 H"
Condenser Weight
54.89 lbs
Air Handler Weight
24.91 lbs
GENERAL INFORMATION
Inverter Technology
Yes
CAPACITY & PERFORMANCE
Zone Capacity
1
Cooling Capacity
12,000 BTU
SEER2
17.5
EER2
8.5
Outdoor Operating Temperature (Cooling)
-13 to 122°F
Heating Capacity
12,000 BTU
HSPF2-4
9
HSPF2-5
6.8
Outdoor Operating Temperature (Heating)
-13 to 75°F
Coverage Area
Up to 550 sq ft.
NOISE LEVELS
Outdoor Noise Level
54 dB(A)
Indoor Noise Level (High / Low)
44.5 / 17.5 dB(A)
ELECTRICAL REQUIREMENTS
Voltage
115V
Phase
1
Cycle
60Hz
Min Circuit Ampacity
19.5A
Max Fuse Breaker
20A
REFRIGERANT & PIPING
Line Set Length
11.5 ft.
Refrigerant Type
R-454B
Refrigerant Volume
21.52 oz
Liquid Line Size
1/4"
Suction Line Size
3/8"
Max Line Set Length
75 ft.
CONTROLS & CONNECTIVITY
Wifi Compatibility
Yes
App Compatibility
Yes
Works with IOS
Yes
Works with Android
Yes
Remote Control Included
Yes
WARRANTY
Warranty
2 Years Compressor / 1 Year Parts

MRCOOL Mini Split BTU Guide

Drawn to scale — 1 square = 2 × 2 ft
36K BTU
24K BTU
18K BTU
12K BTU
9K BTU
6K BTU
6K BTU up to 250 sq ft · Small bedroom, office
9K BTU up to 375 sq ft · Bedroom, home office
12K BTU up to 500 sq ft · Large bedroom, den
18K BTU up to 750 sq ft · Living room, master suite
24K BTU up to 1000 sq ft · Open living area
36K BTU up to 1500 sq ft · Great room, small home
Between sizes? Round up. A slightly larger unit runs efficiently at partial load — an undersized one runs constantly.
Shipping
  • Free Shipping on all orders.
  • Large Appliances: Ship via Curbside Delivery — the carrier delivers to your property but not inside your home.
  • Small Items: Ship via standard ground delivery (FedEx or similar), such as small appliances, range hoods, sinks, faucets, and accessories.
Full shipping policy
Returns
  • 30-Day Return Policy: Return requests must be submitted within 30 days of your delivery date. We cannot process returns after this period.
  • Return Requirements: Products must be unused, uninstalled, and in their original packaging (including box and pallet) to qualify.
  • Restocking Fee: A restocking fee may apply and varies by brand.
Full returns policy
Authorized MRCOOL Dealer
Full manufacturer warranty on every MRCOOL product we sell.

Customer Reviews

Based on 47 reviews
87%
(41)
11%
(5)
2%
(1)
0%
(0)
0%
(0)
J
Jim M. (Los Angeles, CA)
Easy to install and working great.

I needed to replace another unit that a previous contractor didn't do any part of that installation correctly, and the condensation line was leaking inside the house, running down the wall since that installation!! The indoor coil was 1-1/2" out of level, the line set wasn't wrapped, the electrical was tapped into the same circuit as the garage light and outlets...it was a mess.

It took me more time to demo the old unit out than to install the one I bought from you.

Thank you.

B
Bill (Philadelphia, PA)
Very pleased.

Very pleased with the price, delivery, ease of installation, and above all during this heatwave it is working excellently.

N
Natalie N. (San Jose, CA)
Perfect for our needs!

I ordered a 2 zone unit for the bedrooms in our home. It took a few months to arrive (manufacturer issue, nothing to do with HOD, and we were contacted on more than one occasion with an order update which was much appreciated!), but when it did arrive was very easy to install. Both the heat and AC function work perfectly, and our family is very happy!

R
Robert W. (Marietta, GA)
Decent Company

I ordered a HVAC system and it arrived in a timely manner and with no apparent issues. I thought the system was defective once installed but it was the installers fault who wired it wrong. My only issue would be the fee (30% I believe) to return a defective item within the 30 day return policy. If it is defective the customer shouldn't have to pay a fee to return an item that is not operating as designed. Other than that this is a good company.

P
Peter K. (Phoenix, AZ)
Pretty Easy Install and Works Great!

Installed my own central HP system. It was a bit of work but nothing beyond a person with basic mechanical and electrical skills. It took me a while because I had to remove the existing electric forced air furnace from a pretty tight place. Some custom sheet metal work and a bit of custom electrical too. Worked perfectly when powered up and I actually like the thermostat provided, although I wish it was clearer how to set up a temperature set-back schedule. Pre-charged refrigerant piping was something new and I liked that too. The best thing is that my electric utility forked out $4,000 and that paid for the unit!

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