In this case, I don't think the current tenants are irritated.

I have buildings where I have used the loan and some in towns with municipal utility companies that don't apply, but with all the rebates involved I was able to replace 3 fwh oil boilers with new he gas for less than or right at the cost of the oil to gas conversion units because there was no chimney/flu work required.

Tenant sends her check to the PM just to irritate me.

And it irritated me that they would waste my time.It was kind of funny for them to walk by the mailboxes, though, and see every possible international surname you could imagine on the mailboxes LOL.  

They are less likely to be irritated because you explained your situation and they made the decision.

My wife is getting a bit irritated that I am still at the computer as we are going out to eat.

And their loan reads the same way online at least, so I imagine it's just a mistake.But I was irritated by the letter for some reason.  

It's that it's sometimes too strong and can be an irritant to the people using it. 

To re-apply to live where you are already living.I don't know about you, but that would irritate the stuffing out of me, and I'd start planning to move just on principle.Then, you read the letter that says the new landlord will be running a tight, professional ship. 

See https://www.epa.gov/moldBut since the tenants already informed you that they are asthmatic and considering that mold can cause irritation to the respiratory system, I would move them out immediately to be on the safer side.