A heat load calculation is a great way to tinker with building envelope parameters in order to select HVAC equipment, to improve efficiency, and to help choose cost effective installations.

I really like this video. I have blogged a few times about the ‘Red Pen’ test as a way to define the building envelope. This video explains it very well.

Confused? I was. Unfortunately, there are two definitions of the term ‘building envelope.’

We don’t need to wait for regulations to catch up. We can implement good science now.

Uncontrolled air infiltration is like having uninvited guests in our home. We really want invited guests in and uninvited guests out. To achieve this we need to be in control.

If we do an HVAC job without the ‘V’ we end up with a HAC job.