Help my parents get a new ac installed

The air conditioner at Bob and Barbara’s house has gone out again and needs to be replaced this time. As you all know, we live in Arizona and with my dad's health not being that good, I have to figure out something as it’s too hot in the house for them. I usually cover most of their financial needs, but this right here, I just don’t have the money to do so. My nephew's company will donate a new unit; we just need to cover the labor, which is roughly $2500.

I’m asking if anyone can please help us out. I will forever be grateful.