StarFive VisionFive 2 single-board PC with a quad-core RISC-V chip coming in November

Last year Chinese company StarFive launched a compact single-board computer called the VisionFive v1 that’s powered by a 1.5 GHz dual-core RISC-V processor. Now the company has unveiled version two and it’s an upgrade in almost every way. …

Last year Chinese company StarFive launched a compact single-board computer called the VisionFive v1 that’s powered by a 1.5 GHz dual-core RISC-V processor. Now the company has unveiled version two and it’s an upgrade in almost every way. The VisionFive 2 features a 1.5 GHz quad-core RISC-V processor, support for up to 8GB of RAM, and […]

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Does turning the air conditioning off when you’re not home save energy?

Engineers ran the numbers, and the answer varies.

A person's hand adjusting a thermostat that is set to 77° F.

Enlarge (credit: Getty Images | Grace Cary)

Hot summer days can mean high electricity bills. People want to stay comfortable without wasting energy and money. Maybe your household has fought over the best strategy for cooling your space. Which is more efficient: running the air conditioning all summer long without break, or turning it off during the day when you’re not there to enjoy it?

We are a team of architectural and building systems engineers who used energy models that simulate heat transfer and A/C system performance to tackle this perennial question: Will you need to remove more heat from your home by continuously removing heat throughout the day or removing excess heat only at the end of the day?

The answer boils down to how energy intensive it is to remove heat from your home. It’s influenced by many factors such as how well your house is insulated, the size and type of your air conditioner, and outdoor temperature and humidity.

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