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MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz
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DIY 4th Gen·DIY InstallIndoor Unit Only

MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz

Component — Not a Complete System

This is the indoor unit only. To run, you also need a matching outdoor condenser and a refrigerant line set. Looking for the complete system instead? Browse complete 12,000 BTU systems.

SKU DIY-12-HP-WMAH-115C25

12,000 BTUup to 500 sq ft115
Popular4.8 (8 reviews)5 verified buyers
$574.00
Pay over time withAffirmaffirmKlarnaKlarna— see your options at checkout.
In Stock — Ships within 1-3 days

High demand — limited stock available

Customize it — compatible add-ons only

Diameter matched to this unit per MrCool's spec sheet.

Clean channel for the lines running down your exterior wall.

Universally compatible tools and care items — maintenance kit, coil cleaner, install tools.

7-year warranty · Covers up to 500 sq ft
Ships nationwide · exact freight at checkout · Ships in 1-3 business days
30-day returns on unopened products · See policy
Secure checkout:Visa · Mastercard · Amex · Discover
Limited Lifetime Compressor Warranty7-Year Unit Replacement (Compressor) Warranty5-Year Parts Warranty

MrCool DIY factory warranty — register after install to activate the full coverage tiers.

Sizing Help

Not sure if 12K BTU is right for your space?

Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.

Match My SpaceOr call (657) 582-0899

Resources

Brochures & Manuals

BrochurePerformance SpecsInstall ManualRemote ManualService ManualWarrantyEnergy GuideAHRI CertificatesInstall Manual (FR)Remote Manual (FR)Technical Manual (FR)Warranty (FR)Install Manual (ES)

Description

MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz

What's in the Box

Here's what you'll receive with your order

Wall-Mount Air Handler

Indoor ductless mini-split unit

Wireless Remote Control

Handheld remote with temperature control

Mounting Plate & Hardware

Wall mounting bracket and screws

Owner Manual

Installation and operation guide

2 Years compressor warranty
Compressor: 2 Years warrantyParts: 1 Year warranty

Key Specifications

12000BTU

Cooling Capacity

Up to 500sq ft

Coverage Area

115V

Voltage

37/31/23.5dBA

Noise Level

12000BTU

Heating Capacity

MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz — Model Details

What this specific model is sized for, how it installs, how it performs, and what it costs to run.

Room & Space Coverage — 12,000 BTU

The MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz delivers 12,000 BTU of cooling and heating capacity, sized for spaces up to 500 sq ft in standard 8-ft ceiling rooms with average insulation. At this capacity the unit is ideal for bedrooms, home offices, sunrooms, and single-room additions up to the stated square footage. Rooms with one exterior wall and average shading sit comfortably in the middle of the coverage range.

Power & Electrical Requirements

Power requirement: 115V 1-phase 60Hz (standard US 120V household outlet).

Install Difficulty — DIY-Friendly

This DIY 4th Gen Wall Mount Air Handler system ships with a pre-charged Quick Connect line set — no HVAC license, no vacuum pump, no refrigerant gauges. The pre-charged fittings use a hand-tightened mechanical seal that a homeowner completes in 15 minutes per connection. Typical install time from unboxing to first cool air is 4–8 hours for a single-head system.

Sound Level & Comfort Features

Operating sound level ranges from 23.5 dB(A) on low to 37 dB(A) on high — the low end is whisper-quiet, below a normal conversation (60 dB) and comparable to a library reading room.

What's in the Box & Compatibility

Ships as a Mini Split.

Product Details

MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz

Specifications

Cooling Capacity12,000 BTU
Heating Capacity12,000 BTU
Voltage115 V
Noise Level37/31/23.5 dBA
Coverage AreaUp to 500 sq ft
Phase1

Features

  • SmartHVAC app: WIFI control - control your DIY anywhere with your Apple or Android smart device and an Internet connection
  • Standard 7-year compressor/5-year parts warranty; register for limited lifetime compressor warranty
  • Compatible with Amazon Alexa and Google Assistant
  • Includes the new DIY Pro™ Cable, an added safety feature to protect the wiring from the outside elements

Frequently Asked Questions

Everything you need to know about this product

What size room will the MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz cool?

At 12,000 BTU this unit is sized for rooms up to 500 sq ft under standard 8-ft ceilings with average insulation. Add 10–20% for sun-exposed rooms, poorly insulated spaces, or ceilings above 9 ft.

Can I install this myself without an HVAC license?

Yes — the DIY series uses pre-charged Quick Connect line sets that tighten by hand. No vacuum pump, no refrigerant handling, no EPA 608 certification required. Most single-zone installs take 4–8 hours. You may still need a permit and an electrician for the 240V circuit, depending on local code.

What electrical circuit do I need for installation?

115V dedicated circuit with the disconnect within sight of the outdoor unit per NEC 440.14. An electrician will size the breaker based on the minimum circuit ampacity shown on the nameplate. Budget $400–$900 for a new dedicated 240V circuit if one isn't already present.

How fast does HVACZAR ship this unit?

Shipping is calculated at checkout from the order weight, and you see the exact charge before paying. In-stock SKUs leave the warehouse within 1–3 business days. Transit time is 3–7 business days via truck freight (with liftgate delivery) for outdoor units and UPS Ground for accessories. Tracking is emailed at pickup.

What if it arrives damaged or I change my mind?

Inspect the unit before signing for freight delivery. If there is visible damage, note it on the delivery receipt and refuse the shipment — we ship a replacement at no cost. Unopened and unused units can be returned within 30 days for a refund less outbound shipping.

What is the warranty on the MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz?

The MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz comes with a 7-year manufacturer warranty when purchased from HVACZAR, an authorized MrCool dealer. Register your unit after purchase to activate full warranty coverage.

How long does shipping take?

Shipping is calculated at checkout from the order weight. Most MrCool systems ship within 1-3 business days and arrive in 3-7 business days via FedEx, UPS, or truck freight with liftgate delivery.

What size room does 12,000 BTU cover?

A 12,000 BTU unit is sized for rooms up to 500 sq ft. Proper sizing depends on ceiling height, insulation, climate zone, and window exposure. Use our system finder for a precise recommendation.

Do you offer returns?

Yes. HVACZAR offers a 30-day return policy on unopened, unused products in original packaging. Contact us to initiate a return and receive a return authorization number.

How can I pay?

We accept all major credit cards (Visa, Mastercard, American Express, Discover) via Stripe secure checkout. All transactions are encrypted and protected.

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Ships Nationwide — Shop by State

We deliver the MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.

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