Interesting idea and I think it could work well if I do a crowdfuning style marketing campaign to get a bunch of sales at once. Right now I sell about 1 thermostat per month, but it is not at all consistent. I might get 2-3 orders in a week and then nothing for months on end.

I think the real answer is to dedicate more of ny time and effort to this project.

If the volume was higher, I could keep making bigger orders, and drop the price as a result. I'm already doing that now, but very slowly.

Thanks for the suggestion and inspiring me to think more about this.