Steady Room Heating Load Calculator
Estimate a simple steady sensible heating load from envelope conduction and outdoor airflow.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the Steady Room Heating Load Calculator
Estimate a simple steady sensible heating load from envelope conduction and outdoor airflow. The 0.33 coefficient approximates ordinary air volumetric heat capacity in Wh/(m³·K).
The calculation
Worked example
40 m² at U=0.5 and 20 K difference, 60 m³/h ventilation and 100 W internal gain give 696 W, about 2,374.8506 BTU/h.
Assumptions and limits
Not a certified HVAC design or cooling-load model. Thermal bridges, infiltration beyond entered flow, humidity, sun, altitude and transient storage are excluded; no equipment size is prescribed.
Common questions
Which inputs should I use?
Estimate a simple steady sensible heating load from envelope conduction and outdoor airflow. The 0.33 coefficient approximates ordinary air volumetric heat capacity in Wh/(m³·K).
What does the result exclude?
Not a certified HVAC design or cooling-load model. Thermal bridges, infiltration beyond entered flow, humidity, sun, altitude and transient storage are excluded; no equipment size is prescribed.