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Converting a House to Zero Net Energy



Buildings consume 40% of our energy, most of that for heating and cooling. Almost all of this energy is supplied by fossil fuels, resulting in tremendous CO2 emissions. Building electrification solves this problem. Instead of burning fossil fuels in homes and businesses, we can heat, cool, wash and cook using electricity generated from clean, renewable sources.

San Jose is one of the first cities to establish building codes that pursue a zero net energy policy by strongly recommending all electric new homes. But what about existing homes? To find out first hand what was involved in getting to a zero net energy home, my wife and I embarked on a project to completely electrify our 50 year old home in San Jose.

I’ve done quite of bit of energy upgrading on homes and businesses over the past 40 years. Nevertheless, I checked in with a few friends who had done some electrification of their homes (thanks to Howard, Jeff and Dick). The steps we took mostly followed conventional wisdom: address the easy and cheap items first (LED lights, controls), extra insulation, solar with battery backup, EV charger, heat pump HVAC, heat pump water heater and induction cooktop.

There were only two real hassles with this electrification project. The first hassle is familiar to anyone doing a renovation or maintenance project: finding the “best” contractor for each individual task. Because building electrification involves so many different types of contractors, there is no one “general contractor” who can do everything both efficiently and cost effectively. We ended up with five different contractors: insulation, pool, solar, electrical and HVAC. Since I’m capable of screwing in a lightbulb, I took care of the LEDs lights and controls. The biggest hassle was on the electrical permitting side and coordinating with our local utility. Nevertheless, when everything was done and connected, we are enjoying a net negative (for the year) electric bill — including all of our heating, cooling, cooking and most of our driving.

Perhaps the most rewarding event was when our local gas utility PG&E sent an inspector to our house to find out why the gas meter almost stopped completely! To learn more about electrifying your home or business, please listen to this week’s Energy Show. And if you are thinking about making the switch from fossil fuel home appliances to electrical appliances run by solar and battery storage solutions, take a look at our 10 steps to whole house electrification.

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