You cannot. The credit is limited to $600 for AC and $600 for furnace per taxpayer per year for a total of $1,200 for the year. So, if you installed 2 units, you can still only claim the credit for one.
The maximum credit you can claim each year is:
- $1,200 for energy efficient property costs and certain energy efficient home improvements, with limits on exterior doors ($250 per door and $500 total), exterior windows and skylights ($600) and home energy audits ($150)
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