"Hey Dan, for multi-zone mini splits, like the dual-zone system, do you need to install both zones at the same time or can you install it and use one zone, then install the second zone a few weeks later?" Yes. You can do that for some multi-zone mini splits. You will want to check with the specific model because some of them you can do that with. For instance, the MrCool Multi-Zone 36K BTU you can start with a 9k air handler, then add a 12k air handler, then another 9k air handler, etc. There will be a specific order, though. You wouldn't be able to just add whatever air handlers you want, but yes, you can start with one zone and install the rest later on multi-zone mini splits. Multi-Zone mini splits do allow for installing and using only a portion of the air handlers they are built for. For a more thorough answer to your specific setup, you can always give us a call and our team of experts can help you. Have more questions? Just ask them in the comments below or on Facebook or on Twitter.