Software for heating/cooling loads?

[Siberian]

Do any of you perform load calculations on buildings? I'm thinking of heating and cooling loads etc. I haven't found that MEP has any serious such function. Any recomendations as to what software I can use?

[LifeoRiley0]

We use HAP and you are supposed to be able to export an XML file from MEP to HAP but we haven't gotten into it that far.