Hello, 

We are currently modelling Air-Source Heat Pumps for a non-domestic retrofit. We have CoPs available from manufacturer datasheets, which relate to various base operating temperatures (A-7, A2, A10 etc., output temperatures 35 degrees). We would like to apply these at a granular level to model seasonal carbon reduction. 

What would be the best approach for this?

a. Is there a way we can use the manufacturer data on CoPs to convert to Seasonal Performance Factor annually?

OR

b. Use the various CoPs at different base temperatures and use them for the building at seasonal / monthly levels? Would we also require information on base ambient temperatures for specific locations?

Or

c. Another methodology that would be better suited?

Would greatly appreciate any guidance on this.

Thank you.