I even called around to some air test companies and they've not heard of it either.

All of my customers are construction related since my background has been in the construction industry.I joined the Air Force as an apprentice carpenter and became a superintendent within 5 years.

Her edge for me to consider her over others is that she can offer higher and stable rent, but I need to verify if her higher rent is including utilities ASAP; she asked me to increase my asking rent to what she’s allowed from section 8 if I can provide her a cooking stove, and to install central air which I’m considering anyway.And what should I tell my other turned down qualifying applicant without any discriminating element that I might not be aware of if they ask for the specific reason after I’d told them that I’d already chosen a financially better qualifying tenant over them?

I also have a dual-incentive in doing so that coincides very nicely with my own personal plans for myself(relocation and retirement within 10 years).

New Air Conditioner?

That's where all this bail out "money" is coming from - THIN AIR!

I used to install HVAC systems and I think the question you are asking is should you use cable electric heat in the ceilings or should you use an air to air heat pump.

Does your brother make more selling air purifiers than you?

This may go down if the Home Owners Association (HOA) fixes roofs and air conditioners, but now you’re paying HOA dues.I am not a huge fan of selling right now.

As for the dual payments, our plan was to get the $1800.00 rent and cover the additional $1000 (HOA, Taxes, Insurance, etc.) + another $1800 (max.) for the house we are planning to buy.