MRCOOL® 12k DIY 5th Generation Mini-Split Air Handler & Condenser 115V w/ 25ft Pre-Charged Quick Connect® Line Set & DIY® Cable DIY-12-HP-WM-115D25-O
Summary
The 5th Generation MRCOOL® DIY® 12k BTU 23.5 SEER Ductless Heat Pump System delivers effortless installation and powerful heating/cooling for spaces up to 750 sq. ft., with no special tools or experience required. Its pre-charged 25-foot QuickConnect® line set (R-454B refrigerant) eliminates vacuuming, while the DIYPRO® cable replaces electrical conduit for durable, weather-resistant performance—ideal for coastal areas thanks to the Gold Fin® Condenser’s corrosion resistance.
Control your comfort three ways: included wireless remote, SmartHVAC app (iOS/Android), or voice commands (Alexa/Google Assistant). Smart features like Follow Me mode (adjusts airflow based on remote location), Auto Restart, and Dry Mode (dehumidification) optimize efficiency and personalized comfort.
Backed by an industry-leading warranty—limited lifetime coverage, plus 7-year compressor and 5-year parts protection—this 23.5 SEER system combines energy savings, DIY simplicity, and year-round reliability. Upgrade to smarter, hassle-free climate control with MRCOOL® DIY®.
What's Included
-
Indoor Units MRCOOL® 12k DIY 5th Generation Mini-split Air Handler 115v w/ DIYPRO® Cable
- Outdoor Unit MRCOOL® 12k DIY 5th Generation Mini-Split Condenser 115v w/ 25ft DIY Quick Connect® Line Set
- Wireless Remote Controls
- Installation Manual
- User’s Manual
- Manufacturer Warranty
Warranty
- 7 year compressor limited warranty
- 5 year parts limited warranty
Warranty Inquiries are handled through MRCOOL at https://mrcool.com/contact/
Technical Information
DIY-12-HP-WMAH-115D25-O (Wall Mount Air Handler)
BRAND NAME |
MRCOOL |
SERIES |
DIY 5th gen Single-Zone Mini-splits |
MODEL |
DIY-12-HP-WMAH-115D25-O |
GTIN |
00840255587006 |
UPC |
840255587006 |
SHORT DESCRIPTION |
MRCOOL® 12k DIY 5th Generation Mini-split Air Handler 115v |
LONG DESCRIPTION |
Upgrade your space with the 5th Generation MRCOOL® DIY® 12K BTU Ductless Heat Pump Single Zone Mini-Split Air Handler. This system is designed for straightforward, tool-free installation, with no special skills required, and provides efficient heating and cooling for areas up to 550 sq. ft. The pre-charged 25-foot DIY® QuickConnect® line set, filled with R-454B refrigerant, eliminates the need for vacuuming, saving you time, effort, and installation costs. Plus, the included DIYPRO® cable enhances durability by removing the need for electrical conduit, protecting against outdoor elements and wildlife. Take control your way—whether with the wireless remote, the SmartHVAC app for Apple and Android, or hands-free voice commands via Amazon Alexa and Google Assistant. The Gold Fin® Condenser also provides enhanced corrosion resistance, making it an excellent choice for coastal environments. Designed with your comfort in mind, the system’s wireless remote features Follow Me technology, allowing the air handler to adjust based on the remote’s location for personalized comfort. Dry Mode adds another layer of convenience by reducing humidity and preventing excess condensation. With industry-leading warranties, including a limited lifetime warranty, a 7-year compressor warranty, and a 5-year parts warranty, you can trust in long-lasting performance. Experience an easier installation, smart technology, and year-round comfort with the 5th Generation MRCOOL® DIY®. |
FEATURE LIST |
|
TONNAGE |
1 |
VOLTAGE (V) |
115 |
PHASE |
1 |
CYCLE |
60 |
MAX FUSE BREAKER (A) |
15 |
MIN CIRCUIT AMPACITY (A) |
3 |
MOUNT TYPE |
Wall |
COLOR |
White |
MAX COVERAGE AREA |
550 sqft |
DECIBEL RATING LOW (DBA) |
18 |
DECIBEL RATING HIGH (DBA) |
43 |
NUMBER OF SPEEDS |
5 |
OSCILLATION |
Yes |
LIQUID LINE SIZE |
1/4 |
SUCTION LINE SIZE |
3/8 |
FILTER TYPE |
Reusable |
AUXILIARY HEATER INCLUDED |
No |
AUXILIARY HEATER AVAILABLE |
No |
FAN ONLY OPTION |
Yes |
QUIET MODE |
Yes |
AUTO COOL |
Yes |
WIFI COMPATIBILITY |
Yes |
APP COMPATIBILITY |
Yes |
WORKS WITH IOS |
Yes |
WORKS WITH ANDROID |
Yes |
REMOTE CONTROL INCLUDED |
Yes |
UL LISTED |
Yes |
ETL LISTED |
Yes |
ENERGY STAR CERTIFIED |
Yes |
AHRI CERTIFIED |
Yes |
REGISTERED WARRANTY |
Extended Limited Lifetime* |
BASE PARTS WARRANTY |
5 |
BASE COMPRESSOR WARRANTY |
7 |
HAS BATTERIES |
Yes |
CONTAINS ELECTRONICS |
Yes |
CONTAINS CHEMICALS |
Yes |
CONTAINS AEROSOL |
Yes |
CONTAINS COMPRESSED GAS |
Yes |
PROPOSITION 65 WARNING |
Yes |
NET DEPTH (IN) |
7.44 |
NET HEIGHT (IN) |
11.69 |
NET WIDTH (IN) |
31.57 |
NET WEIGHT (LBS) |
24.91 |
GROSS DEPTH (IN) |
16.34 |
GROSS HEIGHT (IN) |
14.37 |
GROSS WIDTH (IN) |
36.02 |
GROSS WEIGHT (LBS) |
35.49 |
Install Manual |
Remote Manual |
Outdoor Model Number:DIY-12-HP-C-115D25-O
BRAND NAME |
MRCOOL |
SERIES |
DIY 5th gen Single-Zone Mini-splits |
MODEL |
DIY-12-HP-C-115D25-O |
GTIN |
00840255586955 |
UPC |
840255586955 |
SHORT DESCRIPTION |
MRCOOL® 12k DIY 5th Generation Mini-Split Condenser 115v |
LONG DESCRIPTION |
The 5th Generation 5th Generation MRCOOL® DIY® 12k BTU 23.5 SEER Ductless Heat Pump Single Zone Mini Split Condenser makes home climate control easier than ever. Designed for effortless installation, this system requires no special tools or professional experience and is ideal for spaces between 350-500 sq. ft. With a pre-charged 25-foot QuickConnect® line set filled with R-454B refrigerant, setup is simple and eliminates the need for vacuuming. The included DIYPRO® cable enhances durability, replacing traditional electrical conduit to protect against weather, animals, and yardwork damage. Controlling your comfort is seamless with multiple options, including the included remote, the SmartHVAC app for Apple and Android devices, or hands-free commands via Amazon Alexa and Google Assistant. Additionally, the Gold Fin Condenser provides exceptional corrosion resistance, making it a great choice for coastal environments. Equipped with a variety of features, this system enhances efficiency and comfort. The Timer function helps manage energy use, while Auto mode maintains your desired temperature without constant adjustments. After a power outage, the system automatically resumes previous settings, and the anti-mildew function reduces condensation buildup in the air handler. Built for longevity, the 5th Generation MRCOOL® DIY® Mini Split offers an industry-leading warranty, including a limited lifetime warranty, plus a 7-year compressor and 5-year parts warranty. Combining advanced technology, user-friendly operation, and long-term reliability, this system is designed for hassle-free home comfort. |
FEATURE LIST |
|
SEER2 |
23.5 |
EER2 |
12.5 |
HSPF2-4 |
10.2 |
HSPF2-5 |
7.6 |
TONNAGE |
1 |
COOLING CAPACITY (BTU) |
12000 |
HEATING CAPACITY (BTU) |
12000 |
VOLTAGE (V) |
115 |
PHASE |
1 |
CYCLE |
60 |
MAX FUSE BREAKER (A) |
20 |
MIN CIRCUIT AMPACITY (A) |
18 |
COLOR |
White |
ZONE CAPACITY |
1 |
REFRIGERANT TYPE |
R-454B |
REFRIGERANT VOLUME (OZ) |
30.34 |
DECIBEL RATING (DBA) |
54 |
INVERTER |
DC |
LINE SET LENGTH |
25 |
MAX LINESET LENGTH (FT) |
82 |
LIQUID LINE SIZE |
1/4 |
SUCTION LINE SIZE |
3/8 |
COMPRESSOR MOTOR TYPE |
Rotary |
AUXILIARY HEATER INCLUDED |
No |
AUXILIARY HEATER AVAILABLE |
No |
FAN ONLY OPTION |
Yes |
QUIET MODE |
Yes |
AUTO COOL |
Yes |
WIFI COMPATIBILITY |
Yes |
APP COMPATIBILITY |
Yes |
WORKS WITH IOS |
Yes |
WORKS WITH ANDROID |
Yes |
UL LISTED |
Yes |
ETL LISTED |
Yes |
ENERGY STAR CERTIFIED |
Yes |
AHRI CERTIFIED |
Yes |
REGISTERED WARRANTY |
Extended Limited Lifetime* |
BASE PARTS WARRANTY |
5 |
BASE COMPRESSOR WARRANTY |
7 |
HAS BATTERIES |
Yes |
CONTAINS ELECTRONICS |
Yes |
CONTAINS CHEMICALS |
Yes |
CONTAINS AEROSOL |
Yes |
CONTAINS COMPRESSED GAS |
Yes |
PROPOSITION 65 WARNING |
Yes |
NET DEPTH (IN) |
11.93 |
NET HEIGHT (IN) |
21.85 |
NET WIDTH (IN) |
30.12 |
NET WEIGHT (LBS) |
83.11 |
GROSS DEPTH (IN) |
16.54 |
GROSS HEIGHT (IN) |
27.56 |
GROSS WIDTH (IN) |
36.22 |
GROSS WEIGHT (LBS) |
65.48 |
Certifications
ADD EXTRA 1/4"-1/2" INSTALLATION KITS?
-
MRCOOL DIY R-410A Charged Line Set 1/4"-1/2" Mini Split Quick-Connection for DIY 9K, 12K & 18K with Connection Wires (Select Size)
Regular price $205.00Sale price $205.00 Regular priceUnit price per$140.00
Line covers
-
12FT PVC Decorative Line Set Cover Kit for Ductless Mini Split Air Conditioners, Heat Pumps, and Inverters systems.
Regular price $73.00Sale price $73.00 Regular priceUnit price per -
16.5FT Brown PVC Decorative Line Set Cover Kit for Ductless Mini Split Air Conditioners, Heat Pumps, and Inverters systems.
Regular price $89.00Sale price $89.00 Regular priceUnit price per
Brackets and Concrete Pads
-
18"x40"x4" Plastic Equipment Mounting Pads – Lightweight, Durable Base for HVAC Units & Outdoor Installations
Regular price $69.00Sale price $69.00 Regular priceUnit price perSold out -
Heavy-Duty Mini Split Ground Stand with Load Capacity up to 500LBS, Condenser Bracket for 9000-36000 BTU Ductless Air Conditioners and Heat Pump, Inverter Systems
Regular price $129.99Sale price $129.99 Regular priceUnit price per -
Heavy-Duty Mini Split Ground Stand with Load Capacity up to 770LBS, Condenser Bracket for 9000-60000 BTU Ductless Air Conditioners and Heat Pumps, Inverter Systems
Regular price $169.99Sale price $169.99 Regular priceUnit price perSold out -
Heavy-Duty Mini Split Wall Bracket with Load Capacity up to 480LBS, Condenser Bracket for High BTU Ductless Air Conditioners and Heat Pump, Inverter Systems
Regular price $59.97Sale price $59.97 Regular priceUnit price per -
Mini Split Compressor Bracket for 6,000 - 28,000 BTU
Regular price $39.97Sale price $39.97 Regular priceUnit price per
We will prepare your order within 24 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION: Please be kindly informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery. To AVOID delays, please check if the provided phone number in the order details is a current number where you can be reached. You can also contact the carrier directly and refer to your tracking number to set up a date and time for your appointment. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. PLEASE verify your shipping address, as changes to the address after freight has shipped can result in an additional 15% or higher fee depending on freight weight and dimensions.
SMALLWARES INFORMATION: Please be informed that for smaller items, such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves, when these items are ordered individually, they may be shipped via FedEx without a signature requirement. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING: Please inspect your boxes thoroughly when you receive them. They should arrive shrink-wrapped and on a pallet. If you notice any damages or imperfections (e.g. crushed box or forklift hole), please write comments on the receipt before signing for delivery, no matter how small damages seem. Contact us immediately to assist you.
Shipping & Delivery
We will prepare your order within 24–48 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map

IMPORTANT DELIVERY INFORMATION
Please be informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery.
To AVOID delays, please make sure the phone number in your order details is accurate and one where you can be reached. You may also contact the carrier directly using your tracking number to schedule your delivery.
It is your responsibility to ensure a safe and secure delivery environment. We are not liable for any packages that are stolen or lost after delivery is confirmed.
Please verify your shipping address carefully. Changes to your shipping address after the freight has been shipped may result in additional fees of 15% or more, depending on freight weight and dimensions.
SMALLWARES INFORMATION
Smaller items such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves may be shipped via FedEx without a signature requirement if ordered individually.
It is your responsibility to ensure a safe delivery location. We are not liable for packages lost or stolen after delivery confirmation. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING
Please inspect your boxes carefully upon delivery. Shipments should arrive shrink-wrapped and on a pallet. If you notice any damage or signs of mishandling (such as a crushed box or forklift puncture), write comments on the delivery receipt before signing, even if the damage appears minor.
Contact us immediately if any issues arise so we can assist you promptly.
SMS Delivery Notifications
If you opted into SMS notifications, we may send you order updates or delivery reminders by text message. Message frequency may vary. Message and data rates may apply. Text STOP to opt out. Text HELP for assistance.
For more details, see our Privacy Policy.
Cooper & Hunter
DETAILED PRODUCT BOOKLETS FOR THIS PRODUCT:
Olivia Series Booklet
Multi-Zone Booklet
Specification Table
Quick-Start Guide
Installation Manual
General Manufacturing Information
Rebates




