Central air system with indoor blower & outdoor condenser generally don't come with pre-charged lines so self-install without certification isn't really an option in US.
I got my EPA 608 universal for free after 2 night of cramming and an online proctored test. Skillcat, I think they charge like $50 if you want a printed card, worth it to me because I wanted to be able to walk into supply houses and buy refrigerant.
I almost did this after I helped a friend install a mini-split.
Having just installed a mini-split in my office shed with a pre/charged unit. I told him it was easy and helped him. We ended up needing to buy an extra long line set to make the distance work, which needed more refrigerant.
I called 15 different places and finally found one that could come out and charge the line for under $350. Which was hard to stomach with the whole unit costing only $750 from Amazon.
Getting the 608 is mostly rote memorization and the only thing required at the federal level. On the state level if you want a trade license that generally takes 4 years, but where I live residential owner-builder doesn't need it.
Me too, except I got it in the SkillCat free trial. Did it while rocking my then baby over a few weeks. Super easy for anyone that is a “good” test taker and has high school level reading
It's not just certification/permitting. The manufacturers often state that the unit must be verified to be installed by a qualified technian or the warranty is void.
Around here anyway, I was getting quotes of 20k for the install & equipment of a central air handler and the outdoor unit.
I'd be dead before the thing paid for itself in electricity cost savings. $20,000 ÷ (~90yrslife - 40yrsold) = $400 / year of neccesary savings to break-even as my casket is lowered into the ground.
Most don't have a payback if the cost of electricity is too high. Let's make them lower cost up front and lower running costs so it's a no brainer when replacement is due.
