Question

Energy.gov is the official website of the United States Department of Energy. On this website, you can find a variety of helpful resources, including resources on how to conserve energy.

Read the information about thermostats then consider the following question:

On a hot summer day, you need to leave your house for 30 minutes. To use the least amount of energy, should you turn off your air conditioning system, turn up the thermostat, or leave it set at your normal temperature? For those of you more familiar with cold winter days, you may consider the same about your heating system on a

Answer 1

cold winter day: Should you turn it off, turn the thermostat down, or leave it set at your normal temperature? Explain your answer.

@Abhisar

Answer 2

I read this don't get it

Answer 3

Well, we use air conditioners when it is hot outside, to feel relatively cooler at your home. When you leave your house that is air conditioned, you will feel that the outside is hotter relative to a person who came from his house that is not air conditioned...

So the reverse process happens when you enter the house from a hotter place, and since it's just 30 minutes, you house (made from wood I guess) will retain most of the cold air inside as wood is a bad conductor of heat. So you can turn off the air conditioner when you leave the house and you will feel the same conditioned air when you come back, then you can turn your air conditioner on for optimal power saving...