It is 78 degrees inside my studio apartment. (Windows don’t open) and I don’t wanna turn on the AC overnight to avoid a high electricity bill. However, I might tonight. How much of an increase will it cost me?

likefunny
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We can use basic physics to work it out by assuming the air in your studio behaves as an ideal gas at standard atmospheric pressure in an isobaric cooling process:

1) Recall the specific heat law Q=mc•delT where Q = heat added to a mass m to raise the temperature by delT and c is the specific heat of ambient air.

2) Assuming your studio is 500 sqft or approx 4,000 cubic feet. So m becomes density of air 0.0765 lb/ft3*4,000 cubic feet.

3) Assuming your desired comfort level is 72F, this means your delT is 6F or 258.7 Kelvin.

4) Dropping those in to Q=mc•delT gives you 0.0765 lb/ft3*4000 ft3*c*(78-72F) = 2,500 BTU

5) Now, a typical split air conditioner has a coefficient of performance e equivalent to around 80% (assuming it is EnergyStar rated LOL!) which means your energy consumption is Q/e = 3,125 BTU or 0.92 kWh.

6) Lastly, assuming your costs of electricity are around $0.15/kWh and your AC unit operates for 8 hours then multiplying across gives you a cost of $1.10 to maintain your studio at a temperature delta of 6F for a whole night.

Thank you, thank you

likesmarthelpfulfunny

Somebody give this person a drink

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Wtf turn ur ac on. Ur comfort is more important than a few dollars on your bill. Live a little.

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Geez. What’s RSM paying these days?

likefunny

My math is not as advanced as Guidehouse (I still don’t know what you said) but here is a simple formula:

Studio Apt = Minimum
8 hours of A/C = Minimum
Your Cheapness = Maximum
Total Est Cost = $1

likefunny

One night? Probably like $10 or less

like

How did you pass your case interview?

Way less than 10, probably 3-5

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So $1.10 for the night. Like i said live a little 🤣

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I have my A/C blasting around the clock and my electricity bill is usually around $40/mo in a 1 bdrm apt

like

Just open the fridge!

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If you are that worried about your bill, call your utility and set up a levelized billing plan. Don’t risk your health over a bill

Wait 78F is hot? 81F is cool enough for me.

HEATHEN

Cover your windows with curtains! Back at my apartment my room would get SO HOT when I left the blinds open

But also... turn on the AC hahah it’s too hot

Every degree increase you should be accounted for. My super once advised me to leave it on at 72 and just in the evenings reduce to 65 but each time you switch it off and turn it on at 90 degrees heat is when your bill surges.

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