joseph Varga wrote:

How does one value the cost/benefit of Insulation in your home? Also what
how do you consider the sq foot cost?


You are on the right track. Reducing the heat-gain heat-loss is the best
investment you can make.
Then have a manual J done and do NOT oversize either airconditioning oe
heating.
A slightly undersized A/C is far better than an oversized system!
- udarrell

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Air Conditioning's Affordable Path to the "Human Comfort Zone Goal"
http://www.udarrell.com/udarrell-air-conditioning.html