Can I really install it myself?

Yes, if you can mount the indoor and outdoor units and handle the electrical connection. The pre-charged Quick Connect line set removes the need for a vacuum pump or gauges. A dedicated 115V circuit may still require an electrician.

What size room does 12,000 BTU cover?

Up to about 550 square feet, depending on ceiling height, insulation and sun exposure. Larger or poorly insulated spaces will need a bigger unit.

Does it heat as well as it cools?

It is a heat pump with a 9.0 HSPF2-4 rating, so it provides year-round heating and cooling. Output drops in extreme cold, as with most cold-climate mini splits.

Can I extend the line set?

The system ships with a fixed 11.5 ft Quick Connect line set. Plan unit placement around that length rather than adding to it.

What refrigerant does it use?

R-454B, a lower-global-warming refrigerant. The system arrives pre-charged, so no field charging is needed on a standard install.

Does it work with a smart home?

Yes. It connects over Wi-Fi through the MRCOOL Comfort app and works with Amazon Alexa and Google Assistant.

MRCOOL DIY Select 12K BTU Ductless Mini Split System with White Wall Mount Air Handler, 115V, 11.5 Ft DIY Lineset, R454B

Q: Where is the MRCOOL DIY Select 12K BTU Ductless Mini Split System with White Wall Mount Air Handler, 115V, 11.5 Ft DIY Lineset, R454B cheapest?

At Home Outlet Direct, for $1,399.00, as of our latest check.

Q: What do buyers say about the MRCOOL DIY Select 12K BTU Ductless Mini Split System with White Wall Mount Air Handler, 115V, 11.5 Ft DIY Lineset, R454B?

Rated 4.9 out of 5 from 48 ratings.

Q: Where can I buy the MRCOOL DIY Select 12K BTU Ductless Mini Split System with White Wall Mount Air Handler, 115V, 11.5 Ft DIY Lineset, R454B?

2 stores we checked sell it, including Home Outlet Direct, Amazon.

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$1,399.00at Home Outlet DirectChecked Nov 12

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What reviewers say

4.9 / 548 ratings

Owners give it 4.9 out of 5 and mostly praise how easily it goes in and how well it heats and cools. Complaints are few and center on the short warranty and the fixed line set length.

What people mention

InstallationPraisedOwners say the pre-charged Quick Connect line set makes setup manageable without HVAC experience.
HeatingPraisedReviewers report it heats well in cold weather, not just cooling.
NoisePraisedThe indoor air handler is described as quiet in living spaces.
WarrantyCriticisedSome owners find the 2-year compressor and 1-year parts coverage short.
Line setMixedThe fixed 11.5 ft length suits many rooms but restricts placement for others.
Smart controlPraisedThe app and Alexa/Google integration are called convenient and reliable.

About the MRCOOL DIY Select 12K BTU Ductless Mini Split System with White Wall Mount Air Handler, 115V, 11.5 Ft DIY Lineset, R454B

This is a 12,000 BTU ductless mini-split heat pump system for single-zone heating and cooling. It conditions spaces up to 550 square feet. The system pairs an outdoor condenser with a white wall-mounted indoor air handler and runs on 115V power.

It is designed for do-it-yourself installation without specialized tools, HVAC certification or prior experience. The 11.5-foot Quick Connect line set is factory pre-charged with R-454B refrigerant, so no vacuum pump or refrigerant handling is needed. A 13-foot DIYPRO cable replaces traditional electrical conduit and protects the wiring from moisture, pests and outdoor exposure.

An inverter-driven, variable-speed compressor holds steady temperatures and reduces energy use. The condenser has a Gold Fin coating for corrosion resistance in humid or coastal environments. Control is by the included wireless remote or by the MRCOOL Comfort app, which handles remote temperature control, scheduling and energy monitoring. It also works with Amazon Alexa and Google Assistant. Modes are Sleep, Dry, Auto and Fan-Only, and the air filter is washable and reusable.

Capacity

12,000 BTU (1 ton)

Coverage

Up to 550 sq ft

Cooling efficiency

17.5 SEER2

Heating efficiency

9.0 HSPF2-4

System type

Single-zone ductless mini-split heat pump

Power

115V, 60Hz, single phase