i also had HVAC mystery issues in my first duplex when we house hacked it.Regarding the Daikin Mini Split - I have one in the 3rd story of my current home and it seems to work great for us. 

It is nicer to use than a regular chlorine hot tub especially on your skin but I don't know if the maintenance is any better or worse, personally.

I would love advice from the community on this issue.  

So I require skin in the game (average is 5% to 15%) to offset this.

Several factors indicate the company is not that concerned about efficiency or ease of customer process: the website, a process that seemed to focus on one issue at a time instead of all issues at once, and consistently poor communications and lack of common sense from the loan analyst we were assigned.It started off very well with the initial point of contact, Austin Lornson, who did a fine job of explaining the general refinancing process, responding quickly and thoroughly to our questions.

Hi first post here just looking for advice, I rent a multi family home 2 unit for about 15 years have been lucky to have both units rented for 10 years no issues, well until now.

Can anyone recommend good companies to root cause  and implement solution to fix this issue?

I want to share my experience with Jenny Yi, an STR designer in case others have had similar issues.

They may also be able to temporarily relocate your tenant to avoid any other issues.

GP's typically have to put skin on the game.