we just upgraded the insulation in the attic, we had 8 inches of blown in insulation for a r20 rating and had 10 more inches blown in for an r50 rating. We noticed a difference right away, the upstairs part of the backsplit was always colder than the rest of the house and now it is nice and warm up there. We had 900 sq ft and the cost was $850. I'm not sure if you can buy the pink insulation they blow in , but if you could buy it and you have enough space in your attic you might be able to do it yourself.