In joist area you would probably need to install a ceiling with insulation to prevent the transfer of heat. the air entering from the soffits is designed to both cool the roof and prevent ice build by having different temperatures outside to inside. In regards to the walls. some companies will inject insulation into the walls however if there is and bracing or conduit or anything that can prevent it from landing perfectly there will be gaps.
But it is much better than no insulation, here is a video:
http://www.bobvila.com/BVTV/HomeAgain/Video-1220-04-0.html
In the basement take a look here: to see the blown in insulation between the joists.
http://www.bobvila.com/HomeAgainExtras/BIBCA/index.html
I personally wrap any pipes including those for HVAC lines to prevent condensation.
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