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How do you model minimum and high efficiency DX cooling and heat pump equipment?

I’m trying to get an understanding of the practice of modelers when comparing minimum efficiency and high-efficiency DX equipment and heat pumps for different applications. I know that detailed performance data is sometimes difficult to get. How successful have you been in trying to get detailed performance data from vendors? If you can’t get data like that, how do you model the equipment? How do you model the indoor fan? If you know it is multispeed, how do you figure out those details? What if all you have is the AHRI data (EER/EER2, SEER2/IEER, COP at 17/47, capacities, full load/intermediate/minimum airflows) what assumptions do you have to make? What performance curves do you use? If you can get data from the manufacturer, what assumptions do you still need to make? Is it different for residential size equipment than commercial?

I’m looking for various answers, not just one, so please weigh in if you have a different approach.