No, credits do not roll over to the next month.
Credits reset at the start of each monthly cycle. For Free plans, this is the monthly anniversary of your workspace creation date. For paid plans, it is the monthly anniversary of your plan purchase date.
Need more help ensuring you get value out of your plan? Reach out to your dedicated CSM, account executive, or contact our support team using the messenger chat bubble below or via email at hello@air.inc for support with incorporating Air into team workflows.