It has been suggested to envelop the whole house in the field, would it still be a good idea to do this even if we have an electric car charging in the garage and solar panels?

No problem. The folks making the wave in their houses are wiring the boxes about 75 feet to 100 feet separation – a little extreme – and the need for a lot of wire – but if you want to experiment, get the wire, single strand #16 copper thread (including the proper ends, available at good electronic stores) and lay it out temperately, or have an electrician do it. Otherwise just use it on one bed at a time, keeping 4 feet away from the transmitter box and 3 feet from the receiver box, and enjoy.

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