Calculate Cooling and Heating Loads

In new building design, typically an architect designs a structure and the mechanical engineer calculates the heating and cooling loads of the building and select correspondent HVAC equipment in the drawings.

In remodeling or retrofit projects, it is the installing HVAC contractor's job and responsibilities to calculate and verify the cooling and heating load of the spaces/rooms. The qualified HVAC technician must find out the following information in order to correctly calculate cooling and heating loads of the conditioned spaces/rooms:

  1. The buildings geographic location, elevation, sunshine/shade, wind water, moisture level.
  2. The building structure (material names and specs).
  3. The desired indoor room design temperatures during both heating and cooling seasons.
  4. The outdoor ambient design temperatures of where the building is geographically located during heating and cooling seasons.
  5. The needed cooling and heating hours of the space/rooms.
  6. The extreme high and low temperatures and hours in both cooling and heating seasons.
  7. The heating or cooling sources of the room (people, equipment, activities and so on).
  8. Commercially proven software such as Wright-J or the similar.
  9. Customer's expectation of zoning, usage and schedule, for example, how often and what spaces/rooms will be contiditioned at one time.
  10. Any others not listed.

Without collecting the above information, estimation of cooling/heating load may not be accurate and the product chosen may not satisfy the heating or cooling needs or expectations. HVAC installer needs to follow whatever the software requires in order to get the right cooling and heating loads and then select the right sizes or models of HVAC equipment for customer.

For quality and liability consideration, customers shall not calculate cooling/heating loads, or select unit size/models, or buy units by themselves.

YMGI will not be responsible for any results from load calculation, unit selection and unit installation by non-qualified parties, as well as improper or incorrect unit selection or  installation due to various reasons.