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.