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MRCOOL DIY Select 12K BTU Wall-Mount Air Handler 115V
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DIY Select·DIY InstallOutdoor Unit Only

MRCOOL DIY Select 12K BTU Wall-Mount Air Handler 115V

Component — Not a Complete System

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

SKU DIYS-12-HP-WMAH-115A13-O

12,000 BTUup to 600 sq ft
Custom quote
Sold out at MrCool right now

We price this to your job and email you a link to purchase — usually within one business day.

Customize it — compatible add-ons only

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

7-year warranty · Covers up to 600 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

Description

MRCOOL DIY® Select is the newest DIY single-zone platform — R-454B refrigerant, DC inverter, and an 11.5 ft pre-charged Quick Connect® line set in the box, so it installs without a vacuum pump or refrigerant license. Energy Star certified. Indoor units available in white or black.

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

MRCOOL DIY Select 12K BTU Wall-Mount Air Handler 115V — 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 DIY Select 12K BTU Wall-Mount Air Handler 115V delivers 12,000 BTU of cooling and heating capacity, sized for spaces up to 600 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.

Install Difficulty — DIY-Friendly

This DIY-series 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.

Product Details

MRCOOL DIY® Select is the newest DIY single-zone platform — R-454B refrigerant, DC inverter, and an 11.5 ft pre-charged Quick Connect® line set in the box, so it installs without a vacuum pump or refrigerant license. Energy Star certified. Indoor units available in white or black. Model DIYS-12-HP-WMAH-115A13-O. Specifications from the MRCOOL product catalog (2026 edition, p.5). This item is quoted to your job — request a quote and we will email you a price with a link to purchase, usually within one business day.

Frequently Asked Questions

Everything you need to know about this product

What size room will the MRCOOL DIY Select 12K BTU Wall-Mount Air Handler 115V cool?

At 12,000 BTU this unit is sized for rooms up to 600 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.

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 DIY Select 12K BTU Wall-Mount Air Handler 115V?

The MRCOOL DIY Select 12K BTU Wall-Mount Air Handler 115V 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 600 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 DIY Select 12K BTU Wall-Mount Air Handler 115V to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.

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