HVAC Load Calculator

Calculate multi-zone heating and cooling loads with sensible/latent breakdown, equipment sizing in tons, and sensible heat ratio. Supports ASHRAE MJ8, EN 12831, and CIBSE Guide A with 24-city climate database.

ASHRAE MJ8 · EN 12831 · CIBSE Guide A

Project Settings

Standard

Design Location

Safety Factor

Summer DB: 33.4°C

Summer WB: 23.9°C

Winter DB: -12.6°C

Indoor Summer DB (°C)

Indoor Summer RH (%)

Indoor Winter DB (°C)

Zone 1: New Zone

Name

Floor Area (m²)

Ceiling Height (m)

Occupants

Space Type

Avg U-value (W/m²K)

Envelope Area (m²)

Glazing Area (m²)

Glazing Orient.

Lighting (W/m²)

Equipment (W/m²)