@Larry Fried Sorry, I might not have been clear in my response.

Thanks @Larry Fried and @Jeff GreenbergJeff, to be more specific that (to fit this forum topic as you said), I am looking into 1.

I believe my friend went to that same 3 day event Fri-Sun this past weekend.

I think he was saying that the cheaper ducts that go in the walls have a layer of insulation and plastic around them thats why they don't condensate.  

Most people are working mon-fri from 9-5, so should i not cold call during those hours? 

TOOLS REQUIRED-Post hole digger, long handled pointed shovel, baulk-line, measurement tape, power tool with plastic cutting blade, extension cords, concrete combination tub, 4' level.

So, be aware of that - once you put those signs out:1) People will take them - often other investors or neighbors that don't want plastic signs in their area, and2) Code enforcement could fine you.  

But after we had tenants whose various dogs ate my porch swing, the plug off a window air conditioner (haven't a clue why the dog didn't fry himself on that one), dug holes in carpets down to the subfloor, ate the bottom off a closet door, chewed open a door and got under the house in the summer heat to stay cool and crushed a duct pipe and (in one case) were kept under the house so I got to clean feces and urine out from under there on my hands and knees....we rethought our  idea of the need for a pet fee.Gail

My occupation is as a scientist in the plastics industry with 21 patents issued under my name; however, my business is real estate investing.

Thanks, @Larry Fried.