DIY 5th Gen Hyper Heat 12K BTU

DIY 5th Gen Hyper Heat 12K BTU

Fast, DIY heating & cooling for a single room

  • DIY Installation
  • Single-Zone Mini-Split System
  • 115V
  • Up to 16 - 19 SEER2
  • Ideal Coverage ~400-550 sq ft

Model: DIYSZ-SYS-38

Premium DIY mini split for rooms up to 750 sq ft. Delivers ultra-high efficiency, smart WiFi control, and fast installation with included pre-charged line set.
$2,359 Complete System Price
  • In stock — ships in 1-2 business days
  • Financing options available at checkout

As low as $197/mo with Affirm

  • Easy DIY installation
  • Heats & cools one room
  • Inverter heat pump tech
  • Smart WiFi app control
  • Ultra-quiet operation

Quick Answers Before You Buy

Is this a DIY system?
Yes. This system is designed for easy DIY homeowner installation — no special tools required.
Does this system provide heating and cooling?
Yes — inverter heat pump technology provides efficient heating and cooling year-round.
Not sure which size you need?
Sq ft and home characteristics determine sizing. Use our Find My System tool for guidance.
✓ Secure checkout ✓ Fast, free nationwide delivery ✓ Expert support ✓ Factory warranty ✓ Financing options

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Expert System Sizing Guidance

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Comfort Made Simple. Install It Yourself.

Key Features

Whole-home heating & cooling

Whole-home heating & cooling

Delivers consistent, balanced cooling to every room through your home’s duct system.

High-efficiency performance

High-efficiency performance

Modern energy-efficient operation helps reduce cooling costs while maintaining reliable comfort.

Works with your existing ductwork

Works with your existing ductwork

Easily integrate with most existing ducted HVAC systems and home layouts.

Will This System Work For Your Space?

BEST FOR Rooms
400-550 sq ft
ELECTRICAL 115V
circuit required
INSTALLATION DIY QuickConnect™
system
CLIMATE Heating down to −13°F

Still unsure? Find My System

Learn More About This System

Detailed Specifications & Documentation

System Type: High-Efficiency DIY Mini Split Heat Pump

The MRCOOL 5th Generation DIY 12,000 BTU Mini Split delivers premium efficiency and improved comfort control for mid-sized rooms.
It combines ultra-high SEER performance with simplified installation, making it one of the most advanced DIY systems available.

Quick System Snapshot
  • 12,000 BTU Heating & Cooling Capacity
  • Covers up to 750 sq ft
  • 115V System
  • Up to 25.5 SEER Efficiency
  • QuickConnect Pre-Charged Line Set Included
  • Smart WiFi Control Included
  • Uses R-454B Refrigerant
Ultra-High Efficiency

One of the highest efficiency ratings in the DIY category, this system is designed to reduce long-term energy costs while maintaining consistent indoor comfort.

Simple Installation Process

The pre-charged line set eliminates vacuuming and complex setup steps, allowing for faster installation with minimal tools.

Smart Home Ready

Control your comfort remotely through the SmartHVAC app or integrate with voice control platforms for hands-free operation.

All-Season Performance
  • Cooling: 5°F to 122°F
  • Heating: 13°F to 75°F
Quiet Operation

Engineered for low sound levels, making it well-suited for bedrooms, offices, and primary living areas.

  • Air Handler TypeWall Mount
  • Capacity12000 BTU
  • Coverage400-550 sq ft
  • Installation TypeDIY
  • System TypeSingle Zone Mini Split
  • Voltage115V
  • SeriesDIY 5th Gen Single Zone
  • Line Set TypeQuickConnect (DIY)
  • Zone TypeSingle Zone
  • Cold Climate EligibleTrue
  • SEER2 Rating16 - 19 SEER2

Installation guides, spec sheets, and certifications will be available for download soon.

Will this work for my space?
Yes — 5th Gen DIY Single Zone systems heat and cool individual rooms or open spaces. Choose system size based on room square footage and layout for best comfort. If unsure, our sizing guide or support team can help.
Can I install this?
Yes — 5th Gen systems use pre-charged Quick Connect® line sets so homeowners can install without vacuum pumps, gauges, or refrigerant handling. No HVAC license needed.
Does it heat in winter?
Yes — 5th Gen systems provide strong, reliable heating even in low outdoor temperatures, making them ideal for garages, basements, bonus rooms, and colder climates.
How loud is it?
Very quiet. Both indoor and outdoor units are designed for low noise levels and smooth operation, even at night.
What else do I need?
Everything needed for installation is included: indoor air handler, outdoor condenser, pre-charged Quick Connect® line set, communication wire, wall sleeve, drain hose, remote control, and mounting hardware. Only basic mounting tools are required.
What is the warranty for 5th Gen DIY systems?
Warranty includes a 5-year parts warranty and 7-year compressor warranty. Warranty remains valid with homeowner installation.
How long does installation take?
Most homeowners complete installation in 4–8 hours, depending on room layout and mounting conditions.

Need Help From a MRCOOL Expert?

Not sure which system is right? Our HVAC specialists can help you choose the correct size and configuration.

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