On Friday, June 20, 2014 8:26:55 AM UTC-4, Stormin Mormon wrote:
On 6/19/2014 6:20 PM, trader_4 wrote:

On Thursday, June 19, 2014 1:15:44 PM UTC-4, Vandy Terre wrote:



You might also wish to consider mounting the air

conditioning unit on the roof to at least slow if

not prevent theft of the equipment. One other

positive result from roof mount is the water

runoff could be spread across the roof to help

cool the house through evaporation.







Now we've truly entered the twilight zone. I've seen lots

of single family houses in NJ and have not yet seen one with

the AC mounted on the roof. And he did say that it's a 90 year old

colonial. See many colonials with flat roofs? The idea that if

you mount the eqpt on the roof, you

could then use the condensate to help cool the roof is totally nuts.

First, the condensate doesn't come out of the compressor, it comes

out of the evaporator, mounted on the furnace. Are you suggesting

the furnace go on the roof? Getting the water to the roof doesn't require

mounting the eqpt there, only running a small hose from the furnace

there. But then that's just as dumb, because the small amount of condensate isn't going to do anything measurable, significant, nada, in terms of

cooling a roof. It;s like a flea farting in the breeze.





Not sure about NJ, but in NYS, the humidity is

usually high enough that a dribble of condensate

won't provide much cooling at all. Roof and

attic typically have insulation, so even if

the water evaporated (unlikely) it will be on

the other side of R-## insulation.



Not that it really matters, but why wouldn't AC condensate
evaporate on a hot roof? Roofs
get so hot in full sun you can't hold your hand on them. It's
not that it won't evaporate, it's that it's a small amount
of water so it's effect on cooling the house is negligible.