If he refuses then I would recommend releasing both from the lease and let them go on their separate ways

I would also consider filing a complaint against them with whatever body licenses/governs them, the BBB, Google reviews, etc. 

If there is no resolution I plan to release the tenant and hope to find one less sensitive to the issue, but this tenant is a dream and I would so love to keep her happy.  

It sounds like they may not even have the capital to purchase and deliver materials (that’s when I’d usually agree to the first payment plus a lien release from the supplier).For timing, I’d lock it down.

AC broke down, despite being 2 years, Hot water heater was reported not working, after 3 bouts of plumbers going out assuring them that the hot water heater was working, it mysteriously started leaking and need to replace the pressure release valve (Point 1).

According to him, exercising your "idea" muscle is like any other muscle in your body.

Is there a release of liability form I can have them sign?

I literally have bleeding rashes on my body from mold in my bathroom that I requested to be looked into.

Don’t jerk the seller around and release the property if you have no means to close on it

Insurance is typically going to cover a sudden and large release of water.