Skip to content

Weekdays 9am - 6pm PST




Call or Text: 844-247-7262

MrCool DIY 3rd Generation 12K BTU Wall Mount Air Handler with Enhanced WiFi

local_fire_department Sale ends in
$638.55 $750.99
local_offer Save 14%
Unit price  per 
    Payment methods
  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Facebook Pay
  • Google Pay
  • Klarna
  • Mastercard
  • PayPal
  • Shop Pay
  • Venmo
  • Visa
visibility 7 visitors are browsing our store
local_shippingEstimated to arrive May 21 - May 29
MrCool DIY 3rd Generation 12K BTU Wall Mount Air Handler with Enhanced WiFi

Note: This is not the full system.

Used in combination with the DIY mini-split condenser, the MrCool 3rd Generation 12K BTU Wall Mount Air Handler with Enhanced WiFi is made for you to easily install on your own. As one of the few air handlers designed for DIY installation, it has a 12,000 BTU capacity and can heat and cool up to 500 square feet. It runs so quietly that it fits into your space without too much noise while it helps keep your air clean and at the perfect temperature for you.

With a wide temperature range, this air handler can handle cooling, heating, or dehumidifying your home with ease. This indoor unit has a variety of modes to fit your exact needs.

In AUTO mode, set the temperature on your thermostat for heating or cooling and the MrCool air handler will automatically operate based on your set temperature and the temperature within the room.

In SLEEP mode, the air handler will increase when cooling or decrease when heating by 2°F per hour for the first two hours. The unit will then stay at the new temperature for six hours before SLEEP mode switches off. With this mode, you can save money while you sleep!

Use the TIMER mode for optimal operation to limit your energy use and save on your electricity bill.

When this unit is in COOL, DRY, or AUTO mode, the anti-mildew function kicks in and continues to run for about 10 minutes with low airflow. This feature dries up condensation inside the air handler to prevent mildew growth. Plus, you can easily control the direction of airflow in your room using the remote to adjust the vertical louver on the unit. Your MrCool air handler will memorize your settings and return to them while it operates. If your power is interrupted with a blackout, your air conditioner will stop, but it will automatically restart and resume its previous function once power returns. No need to reset the setting on your thermostat!

Stay informed on how your split system is working with the 12k BTU MrCool DIY 3rd Gen Ductless Air Handler. If your outdoor unit leaks refrigerant, the indoor unit will display an alert on your air handler. With this feature you can be aware when your unit needs maintenance and keep maintenance costs low.

Your DIY 3rd Generation 12K BTU Wall Mount Air Handler with Enhanced WiFi can also remind you when the air filter needs cleaning, making sure the air you breathe is always fresh. After 240 hours of operation, the display on the air handler will show an alert for you to clean the filter, which is easy to remove and clean. Plus, after nearly 3,000 hours of operation, the MrCool air handler will remind you to replace the air filter so it can continue to operate efficiently.

You can also control your heat and air wirelessly with a remote control or with an app on your smartphone. Order your MrCool DIY 3rd Generation 12K BTU Wall Mount Air Handler with Enhanced WiFi today!


Wall Mounted Air Handler Specifications

Model DIY-12-HP-WMAH-115B
UPC 810512033461
Air Flow Direction Horizontal
Configuration Wall Mounted
Blower Motor Variable Speed
Cooling Capacity 1 Ton
Electrical Phase 1-Phase
Line Set Connection Type Quick Connect
Liquid Line Size 1/4 inch
Product Height (in) 11.69
Product Length (in) 7.44
Product Width (in) 31.57
Series DIY
Special Features Wifi Capable
Suction Line Size 1/2 inch
System Application Type Ductless Split Systems
Voltage 120
Warranty 5 Year Parts, 7 Year Compressor
Weight (lbs) 37.7000
Region Compatibility Nationwide


What's Included?

MrCool DIY-12-HP-WMAH-115B

Owner Manual

In stock items: Products typically ship within 2-3 business days from when you place your order (Please allow 5-7 business days for some MRCOOL products to ship). Due to COVID-19 please allow 7 - 10 days for your order to arrive once you have received shipping confirmation.

Pre-order/Out of stock items: Contact us for estimated shipping timeline. We are experiencing inventory and re-stocking delays due to port congestion. We appreciate your patience and understanding.

High order volume due to COVID-19 may occasionally slow delivery for some items and you may experience extended wait times contacting our Customer Service team.

For the fastest service and online support, please email us at for information regarding your order.

Read the rest of our shipping policy here.

$638.55 $750.99

Customer Reviews

No reviews yet

Customer Reviews

No reviews yet


We offer free shipping on orders over $99 across the contiguous United States. No tax except WY.


Find a better price? We'll match it. See our Price Match Policy.


We use encrypted SSL security to ensure that your credit card information is 100% protected.


You get Expert Lifetime Support when you purchase from us. We're here to help.