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Package units are all in one systems, that usually sit on the roof.

Package units, also known as packaged HVAC systems or rooftop units (RTUs), are a type of heating, ventilation, and air conditioning (HVAC) system that houses all of its components in a single, compact unit. These units are typically installed on the roof or at ground level, and they are commonly used in commercial buildings, industrial facilities, and some residential applications. Here are the key components and features of package units:

Components of Package Units:

  1. Compressor: Package units contain a compressor responsible for pressurizing the refrigerant and facilitating the heat exchange process.
  2. Condenser Coil: The condenser coil is responsible for releasing heat absorbed from the indoor air into the outside air.
  3. Evaporator Coil: The evaporator coil cools and dehumidifies indoor air by absorbing heat and moisture.
  4. Air Handler: The air handler houses the blower fan and is responsible for circulating conditioned air through the building’s ductwork.
  5. Heating Elements: Some package units include electric heating elements or a gas furnace to provide heating during colder months.
  6. Thermostat: A thermostat is used to control the temperature settings and operation of the package unit.
  7. Ductwork: Ducts are used to distribute conditioned air throughout the building.

Key Features of Package Units:

  1. Compact Design: Package units are designed to be space-efficient and are often installed on rooftops to save indoor space.
  2. All-in-One System: Unlike split systems where components are separated (indoor and outdoor), package units house all components in one enclosure, simplifying installation and maintenance.
  3. High Efficiency: Many modern package units are designed for energy efficiency, with features like variable-speed fans and high-efficiency compressors.
  4. Zoning Capabilities: Some package units offer zoning options, allowing different areas of a building to have individual temperature control.
  5. Customization: Package units come in various sizes and configurations to suit the specific heating and cooling needs of the building.
  6. Ease of Maintenance: Because all components are contained in one unit, maintenance and servicing are often more straightforward compared to split systems.

Types of Package Units:

  1. Packaged Air Conditioner (PAC): Provides cooling only and is typically used in regions with warm climates.
  2. Packaged Heat Pump (PHP): Functions as both a heating and cooling system, making it suitable for regions with varying climate conditions.
  3. Packaged Gas/Electric (PGE): Combines a gas furnace and an air conditioner, providing both heating and cooling capabilities.
  4. Packaged Dual-Fuel (PDF): Combines a heat pump and a gas furnace, allowing the system to switch between electric heating and gas heating for efficiency.


Package units are commonly used in commercial and industrial settings, including office buildings, retail stores, restaurants, and manufacturing facilities. They are also used in some residential applications, particularly in areas where space constraints or zoning regulations make them a practical choice.

Overall, package units are versatile HVAC systems that offer efficient heating and cooling solutions for a wide range of building types and sizes. They are known for their convenience, space-saving design, and reliability.