> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/hvac-templates/system-no.-4-psz-hp-packaged-rooftop-heat-pump.md).

# System No. 4 PSZ-HP (Packaged Rooftop Heat Pump)

A Packaged Rooftop Heat Pump (PSZ-HP), as defined in EnergyPlus HVACTemplate, is a climate control system commonly used in commercial and light industrial buildings. It consists of a self-contained packaged unit, typically installed on the roof, that integrates all cooling, heating, and air handling components in a single assembly. 

The system uses a direct expansion (DX) cooling coil and a reverse-cycle heat pump for heating, allowing it to provide both cooling and efficient heating from a single refrigerant circuit. The PSZ-HP draws outdoor air for ventilation and supplies conditioned air through ductwork to serve a single zone. Fans within the unit distribute the conditioned air throughout the space, ensuring effective temperature control and ventilation. This configuration is particularly suitable for applications where a simple, packaged single-zone solution with energy-efficient heat pump heating is preferred.

<figure><img src="/files/RvSS58P45A0XNbP3q8bm" alt=""><figcaption></figcaption></figure>

A PSZ-HP comprises:.

* Plant HVAC component - Air Handling Unit
* Space HVAC component - Air Terminal

The 'Select HVAC Template' form allows for multiple Spaces to be served. Clicking into the 'Spaces' field shows a list of available Spaces. Each selected Space will have one Packaged Rooftop Heat Pump Space HVAC component, providing dedicated single-zone climate control for that space.


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