I have personally not worked on any of these but it does not seem to be anything too crazy.It's an FHA Loan that can be combined with other FHA products like a 203k.I am a Loan Officer for "Correspondent Lender" so I can operate under the rules of over 100 lenders...I would be able to place this in a few hours with 1 email...We would just have to make sure all the boxes are checked...Energy Efficient Improvements Must Be Cost-EffectiveThe financed portion of an Energy Package must be cost-effective.

Does your end buyer often cover the closing costs and attorney's fee or is this something you take out of your profit on the deal?

The cost of enclosed is huge and more risky. 

One thing I've done is called a supply place (non big box - stay away from Home Depot or Lowe's) and ask who they would recommend.  

@Yu Xiao, using that property as a short term rental during the time you own it will open up some additional tax saving potential as will doing a cost segregation study to take advantage of some accelerated depreciation.  

so - what are the ages of those items, how much will they cost to replace, and how long will they last? 

One area that has caught my attention is the Pigeon Forge/Gatlinburg TN area - seems like there is a good rental income to acquisition cost ratio.  

I do think southern NH/seacoast are great markets to invest in with potential for cashflow and high appreciation along with very low vacancy.

Plus, when done correctly, you as the KP can capture the ALL the Fed investment Tax Credits (ITC) plus the  State, MARCS, and Cost Seg Depreciation to massively offset your High W2 / 1099 Income - I wrote a book specifically for people like you and your wife to address your concerns. 

I built the cost into the management fee of my next acquisition that I currently have under contract.