Thanks Tim,
Total floor area from a 2015 Carbon Co-op survey was 138.6m2
EPC total floor area is 155m2
I have room-by-room internal floor area and volume from the ASHP heat loss survey, total internal floor area is 125m2.
I’ve been trying to understand how to ‘calculate the total volume of air per hour using the permeability readings and then see how many air changes an hour that work out as’, but not got there yet.
I have even resorted to AI which suggests that ACH=(Infiltration Rate×Envelope Area)/Volume, and even if my house were a cube (which it of course isn’t) the ACH would be 16.
Is that the right approach?