you don't say if there is a crawl space, slab, or basement. Either way, make sure it is well insulated,especially under the floor if it is a slab or basement. I would be wary of a builder that will refuses to make any changes. After all, extras are $$. As mentioned earlier make sure to use a good housewrap(they are not equal) and make sure all of the openings are taped and sealed properly. Spend the extra and get the walls and attic spray foamed. You'll be a lot warmer in winter and cooler in summer. Keep in mind you will only have a one year warranty from the builder and crews will short cut every place they can. If you don't like something, question it immediately. Educate yourself so you'll know if the explanation is reasonable or if they are blowing smoke. READ YOUR CONTRACT to make sure you understand what the builder will and will not do. That alone can save a lot of headaches and grief.
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