re: A green power grid isn't based in reality with our current technology

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If the government wants to really make a difference they need to give rebates to people who have low electric bills , newer windows , upgraded attic insulation, newer AC units and solar panels. They need to step in and keep power companies from charging people with solar more then other consumers.

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the most efficient HVAC system is one the doesnt have to run. better windows, better insulation and better construction materials will reduce the amount of time you system will need to run. also, switch to LED lighting to reduce energy ussage and the associated heat load other lights can emit.

on a commercial scale, most buildings are not nearly as energy efficient with respect tot heir HVAC and lighting systems. most is driven by upfront capital costs vs long term payback. Also, investing and maintaining in a good BAS controls system can have a huge impact on energy ussage. occupancy sensors, after hours setbacks, variable speed vs constant speed, high efficiency boilers, load shedding,ect.

most facilities are not energy efficient.