You're wasting money on heating! Use your A/C!

A) Use a little energy to move heat. B) Use a lot of energy to make heat. Hmmm, gimmie a minute...

I love how MP is genuinely excited over even the smallest discovery or corrected oversight. A real scientist. Please never change.

Love that you commented about the smaller units in degrees F vs degrees C and phrased it as more "resolution". Nice way to think about it.

Thank you for taking the time for that demonstration, I've been an A/C & Refrigeration technician for sometime now and first time I've seen anyone demonstrate this.

This reminds me of the time I went with my dad to a pawn shop where he was trying to hawk a window a/c unit. It was December or January. The pawn shop employee asked, "It's the middle of winter, what do you want me to do with that thing?" My dad, without missing a beat, replied, "Just turn that thing around in the window and you got yourself a heater!"

I bought a heat pump a few years ago and I have no regrets. I went from using 3.5 full 285 gallon tanks of oil per year to 1.5. One thing to note is that the effectiveness and efficiency of the heating will be reduced the colder it gets outside, and you'll start having to deal with things like ice accumulation. You can pay a bit extra for a heat pump designed to work in colder climates, but I'm guessing window units will not work well in this scenario - maybe something worth testing. I always thought it was strange that window units don't come with a reverse feature built in. It seems like it would be relatively cheap while adding a significant amount of value.

If our politicians approached things as intelligently and diligently as you, we'd have flying cars and a colony on Mars

"we could pretty much exchange the word entropy at any point with equilibrium" thank you for that explanation and application of entropy. It definitely helps me to understand entropy. Looking forward to the next video about improving AC efficiency.

With your intro, it reminds me why I watch your channel. Although I do understand heat pumps as used in residential settings, I generally pick up at least a few tidbits from you on ANY subject, no matter how familiar I am with said subject. Keep up the great work!

Been living off grid over 15 years, you can see so much on my channel. HOWEVER - We have used the output of our multiple small window units ( solar powered ) to make almost all our hot water for 7+ months a year for free. Outbound temps on the AC units exceeds 140 degrees, exchanger recovery is 85% so we get 125 degree water put in storage all day, from it we get 115 to 120 degree water to the showers. My own design, not hard to do.

Startling differences! Your description and explanation of "entropy" is probably the best I have ever seen. Appreciate you, your videos and projects are the most interesting and the most professionally done and I like the way you are able to bring it down to the level where laymen like myself can understand and grasp the concepts.

In Germany we have some laws now that keep us from heating our houses, using cheap gas from Russia or cheap nuclear electricity but obligues us to use heat pumps. In Bavaria we get down to minus 16 celsius or zero Fahrenheit so the external unit is covered up in ice while the hot air concentrates under the ceiling making the people sick. I installed some vertical tubes with fans but that is very noisy.

Excellent video demonstrating how heat pumps work. Just for clarification to anyone confused by the AC unit in the door, hes installed it back to front, on purpose, so that the 'cool' side is dumping its 'coolness' into the hallway, and putting the hot side (that normally would go on the outside of your window) into the room, to heat the room. As you can see; the resistive heater and fan used 669 watt hours (aka 0.66Kwh) to heat the room by 10.4 degrees F The heatpump aka the AC unit, used 197.5 watt hours (aka 0.19Kwh) to heat the room by 16.2 degrees F

Some 30 years ago now, I had the bright idea of turning a window AC machine around to blow the cold air outside and the hot air inside. I was amazed how well that worked! Almost cut my electric bill by 1/4 if memory serves. And that was only using one small unit, I could have done more with multiple units. There are down sides of coarse, one of them being cold starts. If the room is already cold, you wont get the compressor to start unless you heat the thermal couple. Another is the fan noise, what used to be outside is now inside, so the whole machine is just noisier like this. Water, you have to do something with the condensation buildup. And there is nothing pretty looking about the setup, if that matters to any of you. But it definitely works well otherwise once you get it running. Cheers 🍻

Your channel is becoming my favorite place to learn. Thanks for everything

You guys are one of my favorite channels. Always excited to see what new mad science you are going to show next!

Growing in a family of chemist dad, physicist mom, entomologist grandma and chemistry equipment glassblower granddad. Watching your videos feels being at home )

These descriptions of physical phenomena are so good I listen to them all the way through, even though I have the background and already understand them.

That made so much sense. Thank you! I just installed a mini split heat pump. Amazing hose efficient it is.

Since the day I first stumbled upon your channel I fell in love with your unwavering dedication to the scientific method and your precise and accurate articulation of physics. This video is a perfect example of why I value this channel so highly. Looking forward to the next one!