If you look at most successful startups, they're run by people in their mid to late forties, who've gone through the trenches multiple times and had multiple failures, so they understand.
It can't be that difficult to build a great thermostat. So I decided to figure out: What would the thermostat for the iPhone generation look like? I got this bug. It really infected my brain. I kept thinking about it. This could be a cool product that matters and a cool product that has a great business.
While I was designing my home, I was living in different houses all around the world, and I saw thermostats that were just as bad as the ones in the U.S., or houses that needed them but didn't have them. I realised that this was a worldwide problem. I thought, 'Let's fix it.'
I say homes are for families, and you have to make sure you design for the family, not just one person: kids, your wife, your grandparents need to be able to use it.
Computers are great tools, but they need to be applied to the physical world.