This document provides an overview of the capabilities of Carrier's HAP 4.4 HVAC design and energy analysis software. It describes the two main operating modes in HAP - System Design mode for estimating loads and sizing systems, and Energy Analysis mode for hourly energy simulation. Key features covered include building load calculation methods, modeling approach using elements, spaces, zones, air systems and plants, and energy analysis reports. The document also discusses HAP's data management features and provides system requirements for installation.