These were the Nip Impressions columns in May 2016:
Energy is always political
Energy Leakage
Energy ROI Calculations are suspect
The easiest energy savings
A flight of fantasy--wild and crazy energy ideas
The May 2016 Nip Impressions columns were sponsored by CR Meyer, Fulton Systems, Airmaster Aerator, RMR Mechanical, CBG LLC, and Freeman Staffing.
Warning! These files are fairly large (size in parentheses), so you'll want to do this on a high speed connection.
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