Thermostats: Cooler than you think! technology connections heat pump

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Thermostats: Cooler than you think!

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28 comments

Technology Connections 30/12/2021 - 6:22 Chiều

Some additional information!

Firstly, two-stage heating is sorta common so the notion that "there is no medium blast" is probably true but if you have a fancy pants HVAC system, then maybe cranking the heat up might make it go faster. No idea what percentage of homes have a two stage heating system, but I'd guess it's in the 10-20% range.

In re: the thermostat wire question. Apparently, to this day, the current going through the contactors that actually turn on the high current loads such as your A/C or an electric furnace's heating elements is carried through the thermostat. So, it's more than just color coding; they are designed to carry some current, and thus need to be a minimum wire gauge. So while Cat5 cable or similar would probably work for most HVAC systems, it might not be able to carry enough current for others (and could, potentially, pose a fire risk under the right circumstances).

On that note, and I'm mad at myself for not bringing this up, you might have noticed that in the mechanical thermostat, a separate insulated wire connects the R terminal to the contact on the bimetallic strip. This prevents the current from being carried through the bimetallic strip, which could inadvertently heat it up and prematurely stop the furnace. Neat!

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Joshua Gomez 30/12/2021 - 6:22 Chiều

I'v noticed mine at least seems smart enough to run the fan for a while after the heat or cool turns off to get the most out of the energy, but thats about it. Heat/Off/Cool, and On/Auto (Fan)

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CaitieLou 30/12/2021 - 6:22 Chiều

My dad was in the HVAC business for 40 years, so I grew up knowing the thing about furnaces not heating faster no matter how high you set the heat. It led to some rather heated (lel) debates with roommates in college.

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Jacob 30/12/2021 - 6:22 Chiều

I’m positive thermostats have minds of their own. The one in my apartment acts so erratically. I set the program to be 72° during the day and 69° at night with a couple in between steps, but it just doesn’t really follow it. It’ll still be set to 72° well into the evening when it should be cooler. Also, it sometimes lets it get WAYYY warmer than the set temperature without turning on the AC which drives me insane and I really don’t think this is a smart thermostat that can be locked out based on power demands. If it is, I’d be pissed cuz Louisiana gets f*cking hot

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cdurkinz 30/12/2021 - 6:22 Chiều

Ecobee comes with a little remote box you install in the furnace that will send constant power to the thermostat to power it, if you don’t have a c wire. Just an fyi.

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Brady Williams 30/12/2021 - 6:22 Chiều

11:25 *pause for effect
Good stuff, sir. Damn good stuff.

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Mike Ferguson 30/12/2021 - 6:22 Chiều

E

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Tessera Craft & LackLuster Gaming 30/12/2021 - 6:22 Chiều

some thermostats for reptile keeping, have variable power outputs so the heating elements can run at 70% 100% of the time rather that 100% 70% of the time. these are rather expensive thermostats though

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Omar Yassin 30/12/2021 - 6:22 Chiều

Man, your content is just perfect!

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duckslayer92 30/12/2021 - 6:22 Chiều

As soon as I started watching this I thought pwm but I was pumped when you made the connection

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Fred Almonte 30/12/2021 - 6:22 Chiều

This is interesting. When I switched out the old mercury switch thermostat for a programable one, I found that there were only 2 wires coming out of the wall and they were both brown.

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taylor sutherland 30/12/2021 - 6:22 Chiều

Boilers are much more fun than dumb furnaces…..

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taylor sutherland 30/12/2021 - 6:22 Chiều

Many furnaces have 2 or 3 stages. As in low, medium, and full blast.

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Gerald Walling 30/12/2021 - 6:22 Chiều

The Thermostat should be place about 6 feet above or below the return. This causes the Thermostat to use the average air temperature coming from all sources. Having the Thermostat in a room away from the return will cause more warm and cool spots through out the home.

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maggy lévesque-lavoie 30/12/2021 - 6:22 Chiều

Wonderful QUIET !

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Jack Kohlruss 30/12/2021 - 6:22 Chiều

I’m boosting engagement

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Thorn Mountain 30/12/2021 - 6:22 Chiều

Well you left out modulating furnaces which have variable heating.

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I am Feeling Frumpy 30/12/2021 - 6:22 Chiều

Also heat transfer is proportional to temperature difference across a barrier, so the higher heat setting on a toaster needs higher on time because it's also losing heat faster (don't know how much that effect applies to kitchen appliances, I'm no physicist)

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Emerald Queen 30/12/2021 - 6:22 Chiều

You have the EXACT same thermostat that’s in my house?

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ComputerSchool101 30/12/2021 - 6:22 Chiều

Just tried putting in an Ecobee smart thermostat. My thermostat didn't have the "C" wire, so it wanted me to rewire some of the furnace. No thanks.

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Cody 30/12/2021 - 6:22 Chiều

2 stage furnace runs at 60% capacity in first stage and 100% capacity on second stage. Depends on furnace and settings but normally will run 10 minutes first stage then jump to second stage

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AWESOME ANCHOVIES 30/12/2021 - 6:22 Chiều

Engagement booster

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Heelincal12 30/12/2021 - 6:22 Chiều

Last comment – Ecobee allows for this!

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BradyPostma 30/12/2021 - 6:22 Chiều

Engagement engaged.

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Martin Lebl 30/12/2021 - 6:22 Chiều

I remember my old thermostat that at the end of the bimetal coil had a glass enclosure with few metal probes, and blob of mercury, which worked really well, and avoided sparking, but I suppose magnets are a bit more environmentally friendly version of the analogue thermostat.

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Ricky Quan Jr. 30/12/2021 - 6:22 Chiều

Blue wire?! 👀

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douglasheld 30/12/2021 - 6:22 Chiều

12:28 oh, I thought it was the , and . keys….

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J03 MAN 30/12/2021 - 6:22 Chiều

I had an apartment thermostat that turned on the resistive heater if I tried to raise the temperature by more than one degree at a time.

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