Utilize your good credit, get credit cards, trade accounts with home depot, lowes, and other suppliers.

You did not require in your contract that all subs and suppliers be registered before they can work. 5.

He said that he owned factories, it means he buys machines, manage worker, deals with supplier, and global politics!

I am looking for discount building suppliers.  

Maybe you can work out short term financing with suppliers? 

There are also many DIY friendly suppliers out there (most licensed plumbers will charge a lot for this retrofit because they're not familiar with it).If you still want to deal with the A/C....again, insulation and air sealing will get you the most bang for your buck, BUT for a fancy energy efficient upgrade you're probably better off pairing PV panels with a small cassette unit from Panasonic....skip the geothermal. 

I have relationships with suppliers and get very good pricing , thats my benefit , not the customers .  

Additionally, they may have significant capital tied-up in tools and equipment and of course, their network of subs and suppliers is priceless.If direct capital is used only for direct expenses, at cost, and they take their payout at the end when the house sells, they share in the risk and so should share in the reward at a measure greater than if they were just a hired hand.Regardless of which path you take, be sure to have your attorney structure the deal and/or review the contract for the company you hire.On another note, if I may suggest it, before you even consider going further in any direction, go meet with them (or any potential candidate)... have a face-to-face.  

I let my suppliers deliver their stuff, my time is much more valuable than free delivery. if they don't know that you could strong arm suppliers for a free delivery, maybe they're not as good as they say they are.

First , the tenant could have signed up with a different energy supplier , some of those put the screws to you , they give you a loss leader and then hit you hard .