How recession-proof is the HVAC industry?

I'm currently an electrical/computer engineer in my early 30s but am pretty disillusioned with the industry. If I get laid off from my current job, I'm considering pivoting to HVAC.

My current plan would be to enroll in a 1 year community college program to get some certificates. If the economy slows down even more by the time I graduate in 2026, how hard would it be to get something full time at the entry level?

Still not sure what specific aspect of HVAC I would train for (residential/commercial/control systems/etc) so general advice is also welcome.