My dad owns an HVAC business and wants me to take over one day. newbie advice

so long story short, i got laid off and my dad came to me saying that I should take over his business in 5 or so years.

I'm gonna attend trade school next month and will go on jobs with him on saturdays. past 2 months. I've been going on ride alongs with him.

My dad works by himself and never hired anybody. He doesnt do installing. he does service repairs. he also does appliance repair (washer, dryers, fridge, etc) so that he has work on the off season.

Even when i graduate trade school in 9 months, do I need installer exp? is this something I can go into from trade school and learn from him? Considering working at a company for 2 years to gain exp with new tech that my dad did not keep up with. I'd appreciate any feedback and input.

*been working on my epa universal on skillcat for now.*