If you aren't ready to build your own, there are thousands of templates available online. However, be cautious:
Where: Q = heat loss (kW) U = overall heat transfer coefficient (W/m²K) A = area (m²) ΔT = temperature difference (°C) V = infiltration rate (m³/s) hvac calculation excel sheet 2021
Specialized formulas for moisture gain from fresh air, occupant humidity, and equipment. Sizing & Airflow: If you aren't ready to build your own,
Don't pay $500/year for a cloud subscription when a $15 Excel template does 80% of your daily sizing tasks. Download a 2021-updated sheet (ensure it uses the latest refrigerant properties) and keep your calculations transparent. hvac calculation excel sheet 2021