Factory Pre-Charged R-454B HVAC Systems Designed for DIY Installation

Explore our latest generation of DIY HVAC systems designed for simplified installation and built around next-generation R-454B refrigerant technology. This collection features MRCOOL® systems engineered for homeowners, contractors, and light-commercial projects looking for high-efficiency heating and cooling without the complexity of traditional HVAC installations.

997 products

DIY HVAC Systems Included in This Collection

DIY Ductless Mini Split Systems (Single-Zone & Multi-Zone)

Single-zone and multi-zone ductless mini split systems provide energy-efficient heating and cooling without requiring traditional ductwork. These systems use an outdoor condenser paired with one or more indoor air handlers to deliver targeted comfort throughout a home or building.

Ductless mini split systems are ideal for a wide range of applications, including:

  • Homes without existing ductwork
  • Room additions and home expansions
  • Garages, workshops, and outbuildings
  • Finished basements or attic spaces
  • Supplemental heating and cooling for specific rooms

Because mini splits operate as zoned HVAC systems, each indoor air handler can control the temperature of its own space independently. This allows homeowners to maintain different temperatures in different rooms, improving comfort while reducing unnecessary energy use.

Single-zone mini split systems are designed to heat and cool one room or area, while multi-zone mini split systems connect multiple indoor air handlers to a single outdoor condenser, allowing multiple rooms or zones to be conditioned with one system.

Modern ductless heat pump technology provides high-efficiency heating and cooling year-round, making mini splits one of the most versatile HVAC solutions for residential and light-commercial applications.

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DIY Central Ducted Heat Pump & Central Air Conditioning Systems

Our collection of DIY central ducted heat pump systems and DIY central air conditioning systems provides efficient whole-home heating and cooling using traditional ductwork. These systems are designed for homeowners replacing older central HVAC equipment or upgrading to modern high-efficiency heat pump technology.

DIY central ducted systems deliver the familiar comfort of a traditional central air system, while offering improved energy efficiency and simplified installation compared to older HVAC equipment.

These systems are ideal for:

  • Whole-home heating and cooling
  • Replacing aging central air conditioners or heat pumps
  • Homes with existing ductwork
  • New construction or full HVAC replacements

Modern central ducted heat pump systems provide both heating and cooling from a single system, making them an energy-efficient alternative to traditional furnace and AC combinations in many climates.

For cooling-focused climates, DIY central AC systems offer reliable air conditioning performance without integrated heat pump heating functionality.

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Pre-Charged Packaged Gas & Electric HVAC Systems

Packaged gas and electric HVAC systems combine a natural gas furnace and electric air conditioning system into a single outdoor cabinet. These systems are often referred to as gas pack HVAC units or packaged gas/electric systems.

Gas pack systems deliver powerful heating performance for colder climates while still providing reliable central air conditioning during warmer months.

These packaged systems are commonly installed in:

  • Homes requiring strong furnace heating performance
  • Manufactured homes and modular housing
  • Rooftop package unit installations
  • Residential homes with limited indoor equipment space

By combining the furnace and air conditioning system into one factory-assembled cabinet, packaged gas/electric HVAC units simplify installation and reduce equipment footprint, making them a practical solution for many residential HVAC applications.

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Dual Fuel Heat Pump Systems

Dual fuel heat pump systems combine the efficiency of an electric heat pump with the powerful heating performance of a gas furnace. These hybrid HVAC systems automatically switch between heat pump operation and gas heating depending on outdoor temperatures, helping maintain comfort while improving overall energy efficiency.

In milder weather, the heat pump provides efficient electric heating and cooling, reducing energy consumption and operating costs. When outdoor temperatures drop and additional heating power is needed, the system automatically switches to the gas furnace for stronger, more consistent heat.

Dual fuel HVAC systems are ideal for:

  • Homes located in colder climate regions
  • Homeowners looking to balance energy efficiency and heating performance
  • Replacing older furnace and air conditioner combinations
  • Whole-home heating and cooling using existing ductwork
  • Homeowners wanting flexible heating options depending on weather conditions

By combining two heating technologies into one system, dual fuel heat pump systems provide year-round comfort, improved energy efficiency, and reliable heating even during extreme winter temperatures. These systems offer the familiar performance of a traditional furnace with the added efficiency benefits of modern heat pump technology.

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