Our next door neighbor worked for People's Natural Gas (yes, that's what it was called), and they had a gas dishwasher, air-conditioning, and an incinerator in their garage. I'd never heard of gas A/C. By the time I was in high school, the dishwasher and A/C had been switched over to electric, and the incinerator could no longer be used within city limits, so it sat and rusted.