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Hello -- I know this is two years old but thought I'd chip in as I was looking for something similar recently. ASHRAE's Load Calculation Application Manual has a CTF and RTF generator that you can download in spreadsheet format (here's the link. There's also a tool that Ipseng and Fisher (Oklahomo State University) created called "PRF/RTF generator" -- I've downloaded it a while back but can't seem to find the link again. PM and I'd be happy to send it through to you.