# How to calculate heating and cooling loads

**Residential HVAC Load Calculations**

HVAC Load Calculation Example · 2, x 25 = 62, base BTU · 4 people x = 1, · 12 windows x 1, = 12, · 3 exterior doors x 1, = 3, · 62, +.

Heat load is measured in BTUs (British thermal units). One BTU is approximately joules and is defined by the amount of energy required for heating or cooling a single pound of water by one degree. Here is a simple to use formula. It is not intended to be the standard of truth, but it will definitely give you an idea of what direction to take in planning your HVAC system.

### Since the load due to sunlit surfaces varies as a function of solar time, it is preferable to calculate the cooling loads at different solar times and choose the maximum load for estimating the system capacity. From the sensible and total cooling loads one can calculate the Room Sensible Heat Factor (RSHF) for the building.: How to calculate heating and cooling loads

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Heat Load Calculation: Manual J Made Easy
Since the load due to sunlit surfaces varies as a function of solar time, it is preferable to calculate the cooling loads at different solar times and choose the maximum load for estimating the system capacity. From the sensible and total cooling loads one can calculate the Room Sensible Heat Factor (RSHF) for the building.

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