However, I noticed that as a Costco member, they also offer HVAC services, including the same product line (Lennox), along with a 10% Costco Shop Card if you go through them.Has anyone here used Costco for their HVAC needs?

It's certainly not impossible, but it's probably going to take you more time and more deals to win one.Like you, this was my goal when I first started out. 

INstead of just saying "no" we asked them to check with their credit card company if they offer travel insurance yada yada.. we got a 5 star review form them without giving a refund.

You win in both scenarios.

It could be a massive failure, but it could also be a small - moderate, LTR win.  

If you need working capital, commercial credit cards, or help fixing your credit to get funded, I'm open to helping.

•Use business credit or 0% interest credit cards strategically—just be careful with repayment timelines.Next StepsThe biggest thing you can do right now is surround yourself with experienced investors, agents, and lenders who have done what you’re trying to do.

I think that would be a win-win for everyone. 

Once I sell that I’m gonna convert to a fourplex and do the ADU.going through cash quickly and also using credit cards when possible like to purchase materials.

Keep your payment at no more than 35% of your income and minimize your credit card and auto debt.