Can you do the installation yourself? In my country i have to make a HVAC technician come to check the installation and sign a paper before i can start mine (200€ for a 15 minutes job, but it's less than the 2-4k it would cost to not do it myself)

[edit] i say that because my hardware is 2.5k euros, so ~3k¯dollars, so we probably have the same high end stuff, and i guarantee you it's not hard to install, and it can be quite fast if you have help from your SO.

Generally for anything electrical you cannot do it yourself without violating some clause or regulation. I still do it all the time though.

If you’re absolutely sure you know what you’re doing I don’t see an issue from breaking regulations in a country that doesn’t have even the most basic of government functions (i mean this generally, not just in the sense of the actual government shutdown that’s happening right now). The real issue is the ‘are you sure you know what you’re doing?’ part.

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 always wondered how difficult it was to do this. I’m really glad to know it’s possible

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.

608 lets you buy the refrigerant

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

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.

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.

Depends on where you live. Someone that has the tools can do it themselves and then shut the fuck up, which is how I suspect most of them in America get installed. Code/planning enforcement commonly surveils residences via satellite or air images but they're not noticing a mini split installed.

Newer units (not all) in the US come pre-charged up to a certain size of lineset. Manufacturers can sell you a whole unit with a charge. The rest is easy to source locally though I haven't tried to get nitrogen myself.

Of course you have exactly one chance with your install this way until you have to call someone.

nitrogen is available at any welding supply store. The container and pressure regulator is like $200 though.

Or else?

This is similar to just about everything mechanical (e.g. auto maintenance). The labor is always the biggest fraction of the cost, not the parts. You always have the option to DIY.