Since HAP is proprietary commercial software, it is not available as a simple "freeware" download. You must obtain it through official Carrier channels:
: Calculations based on ASHRAE 90.1 and Heat Balance Method. System Requirements download hap 5.1
HAP 5.1 is a legacy version. The current standard is HAP 6.x . HAP 5.1 was last updated in the early 2010s and is not compatible with modern 64-bit-only versions of Windows (like Windows 11 or Windows 10 64-bit) without special configuration. Since HAP is proprietary commercial software, it is