not familiar with nhsaves but used their counterpart in Mass which is Massave for spray in insulation in the attic. Definitely a difference since they did it a few years ago. the savings was 75% a nice deal if your thinking about it (again in Mass.) got the interest free loan for a new boiler a few years back too huge saving in the gas bill. My gas bill has dropped by the amount of the loan every month so it's literally paying for itself. Not to mention the piece of mind changing out a 35 yr boiler which is really priceless.
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