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I looked at your inputs and found a couple differences that explain this: 1) the HP is variable speed while the central AC is single stage, and 2) the HP has an SHR of 0.78 while the AC has an SHR of 0.73.

If I change these two inputs in the AC file to match the HP file, the results are nearly perfect. See below, where the first column is your AC results, the second column is the AC results with the two input changes, and the first column is your HP results. The 2nd and 3rd column are nearly identical for annual cooling load and peak cooling load.

image description

I looked at your inputs and found a couple differences that explain this: 1) the HP is variable speed while the central AC is single stage, and 2) the HP has an SHR of 0.78 while the AC has an SHR of 0.73.

If I change these two inputs in the AC file to match the HP file, the results are nearly perfect. See below, where the first column is your AC results, the second column is the AC results with the two input changes, and the first third column is your HP results. The 2nd and 3rd column are nearly identical for annual cooling load and peak cooling load.

image description