All Lowes or Home Depot do is sub the work out to a contractor. So you would be paying them a hidden fee and the contractors fee. Get 3 estimates from contractors on your own.Be sure they include in the estimate the seer rating of the unit, and brand.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.