DIY 5th Gen Hyper Heat 18K BTU

DIY 5th Gen Hyper Heat 18K BTU

Fast, DIY heating & cooling for a single room

  • DIY Installation
  • Single-Zone Mini-Split System
  • 208-230V
  • Up to 16 - 19 SEER2
  • Ideal Coverage ~550-800 sq ft

Model: DIYSZ-SYS-37

Powerful DIY mini split for spaces up to 1,000 sq ft. Combines strong heating and cooling with high efficiency and simple installation using QuickConnect technology.
$2,909 Complete System Price
  • In stock — ships in 1-2 business days
  • Financing options available at checkout

As low as $242/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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Fast, Free Nationwide Delivery

Expert System Sizing Guidance

Full Factory Warranty Support

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
550-800 sq ft
ELECTRICAL 208-230V
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-Capacity DIY Mini Split Heat Pump

The MRCOOL 5th Generation DIY 18,000 BTU Mini Split is built for larger rooms where stronger output and efficiency are both essential.
It provides reliable heating and cooling with a streamlined installation process designed specifically for homeowners.

Quick System Snapshot
  • 18,000 BTU Heating & Cooling Capacity
  • Covers up to 1,000 sq ft
  • 230V System
  • Up to 22.5 SEER Efficiency
  • Pre-Charged QuickConnect Line Set Included
  • Smart WiFi Control Standard
  • Uses R-454B Refrigerant
Balanced Performance & Efficiency

Designed to deliver strong output while maintaining energy efficiency, making it ideal for larger single-zone applications.

DIY Installation Advantage

QuickConnect technology eliminates complex installation steps, allowing homeowners to install with confidence.

Smart Comfort Control

Easily manage your system through the SmartHVAC app, including scheduling and remote adjustments.

Wide Temperature Range
  • Cooling: 5°F to 122°F
  • Heating: 13°F to 75°F
Low Noise Operation

Designed to operate quietly even at higher capacities, maintaining comfort without disruption.

  • Air Handler TypeWall Mount
  • Capacity18000 BTU
  • Coverage550-800 sq ft
  • Installation TypeDIY
  • System TypeSingle Zone Mini Split
  • Voltage208-230V
  • 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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