The Pacific Northwest is more or less “naturally” air conditioned and the need for a mechanical air conditioning system is rarely as necessary as it is in other parts of the country. Some areas deem them essential to being able to live there.
As a result I don’t see all that many Air Conditioning systems—-and when I do they are more likely to be incorporated into high-end homes or commercial structures and often in conjunction with heat pumps. Frankly I see Heat Pumps as a more economically justifiable system in the Northwest—-with the Air Conditioning aspect being just a side benefit that comes with the Heat Pump. It is the other way around in most parts of the country.
The picture below shows the basic approach to installing air conditioners in the NW when it is NOT a high end home. It is very important to get yourself a good saw horse—-one that you can cut the legs off of so that it will sit nicely on whatever pitch your roof is. You can use any old piece of plywood as a shelf—-it will delaminate appropriately on its own over time.

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Charles Buell, Real Estate Inspections in Seattle
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i have a doubt on fitting the air conditioner for my roof..now it got clarified. great info here. keep posting.