I had an energy efficient mini split system installed in May 2022, but filed my taxes for 2022. Can I still submit for an energy credit (Form 5695) in 2022 or 2023?

You will have to amend the 2022 tax return that was filed to get the Home Energy tax credit.

An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 20 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-already-filed/L4VjJ9BA2_US_en_US?uid=ld1n99kr

To enter Home Energy Credits -

Click on Federal Taxes (Personal using Home and Business)
Click on Deductions and Credit
Click on I'll choose what I work on (if shown)
Under Your Home
On Home Energy Credits, click the start or update button

Or enter energy improvements in the Search box located in the upper right of the program screen. Click on Jump to energy improvements

On the screen Tell Us How Much You Paid for Energy-Saving Improvements -

Qualified energy property is any of the following.
• Certain electric heat pump water heaters; electric heat pumps; central air conditioners; and natural gas, propane, or oil water heaters.

Enter the cost in the box labeled Energy-Efficient Building Property.