Just finished my first month as an aircon apprentice, some honest observations

Been on the tools for about nine years now, started at 25 after doing security work. First two years were the grind you're describing, lots of carrying and cleaning and watching. What changed things for me was getting my refrigerant ticket through night classes while I was working. Once I could legally handle the gas side myself the pay jumped and the boss started trusting me with solo jobs.

The on-call summers are real. My worst stretch was three weeks of callouts during a heatwave, doing six or seven jobs a day. You learn to keep your van stocked so you're not driving back to the shop for parts. But that's also when the overtime money is genuinely good, and I paid off my car with one summer's worth.

One thing I'd say to you at your stage: keep a notebook of every unit you see. Write down the model, what was wrong, what fixed it. After a year you'll start seeing patterns and diagnosing gets way faster. The old bloke who trained me did that and it's the single best habit I picked up. Small companies like yours are the way to learn honestly. You see everthing instead of being stuck on one type of job like the big crews do. Sounds like you've landed somewhere decent.

I did residential service for six years out of trade school and eventually moved sideways into commercial building maintenace, so my take is a bit different from the guy who stuck with it. The trade itself is solid and the skills transfer, but I hit a wall around year four with the summer schedule. Being on call from June thru September, getting rung at 9pm becuase a unit died during a heatwave, that stuff wore on my family more than I expected. My knees and my marriage both improved when I took a facilities job at a hospital campus. Same fundamentals, but the equipment is indoors, the hours are fixed, and the pay ended up comparable once you count the pension. One thing I would add for the younger crowd: don't sleep on the paperwork side. I knew plenty of techs who were brilliant with a multimeter but stalled out because they wouldn't document their work or talk to customers without mumbling. The guys who moved up fastest were average wrenches who wrote clean notes and explained things clearly to homeowners. Also, warehouse expirience is not wasted time like some people think. Reading pick tickets and hitting deadlines made the dispatch side of this job feel easy for me. You'll probaly get offered a lead tech role quicker than the 19 year olds who've never had to show up somewhere on someone else's schedule.

The money side is better than people think once you're solo. I clear about 40 units a week in peak season just doing repairs, and most of them are swaps or cleans that take under an hour once you know what you're looking at. The bottleneck is never the work, it's having enough hands. Only thing I'd add on the physical side is look after your back early. I crawled attics from my mid twenties like they were nothing and now at 40 I won't take a job that means more than an hour up there. Knee pads and taking the extra minute to reposition instead of twisting saved me more than any course ever did.

Update: enrolled in night classes to get my refrigerant ticket, been saying for weeks I'd sort it eventually but the third reply here laid out how quick the jobs get once you know what you're looking at. Figure the sooner I'm certified the sooner that pay bump stops being a promise. Boss is on board with Flexible hours around the course too.