Check out the Global Cooling Prize, organized by @RockyMtnInst and @conservationx
The Global Cooling Prize is a global competition to spur development of a radically more energy efficient cooling technology. The Prize will attract talent drawn from across sectors, and across the world, to the task of designing a room air conditioner for a typical tropical or sub-tropical home that consumes five times (5x) less grid-supplied electricity, per unit of cooling, than a typical unit in operation today. The winning solution will also need to operate within predefined constraints on refrigerant type, materials, water consumption, full-load power consumption, and maintenance requirements. It will also need to be affordable to typical consumers; costing no more than twice the retail price of today’s standard units at assessed industrial scale (which would result in a simple payback period of less than three years).