20-Year Prospect
You know those movies where a handful of survivors have to create a new world order after some alien attack or disease-a-palooza? That's basically the only type of scenario that would bring an end to HVACR jobs in twenty years.
The demand for those with HVACR skills is growing, and fast. If you marked the field's growth inside a door frame (like ol' momma Shmoop used to for us), you'd end up on the roof in no time. According to the Bureau of Labor Statistics, this industry is going to grow by twenty-one percent in coming years, which is great news for people working in this field—there should be plenty of work to go around (source). If you're interested in HVACR, there's no need to sweat your future prospects.