I installed a Mr. Cool DIY mini split in my home for 2 rooms and so far it’s been great. That initial foray was a bit of an experiment. I’d like to just replace my central air now with a ducted heat pump but I haven’t found a good solution that doesn’t cost a ridiculous amount for a professional to install.

I think you have a big problem with selling direct to homeowners. Most HVAC companies will not touch a homeowner-purchased system. So if you’re selling direct, then you’re going to need DIY quick connect line sets like Mr. Cool.