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[Ecobee.com] Ecobee SmartSensor 2 pack $69

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  • Dec 12th, 2019 1:18 am
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Nov 25, 2002
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mrl14 wrote: The occupied room feature of these sensors is pointless at night. You don't move enough while sleeping so it'll just think the room is unoccupied. The only reason to get these is if you need to monitor a temperature in a room (ie. baby's room), but if you set a normally colder room to a certain temp, the rest of the house could get super hot. Basically there are a ton of usability/edge cases with these things that make them hard to understand and use.
It's not totally useless. At night, when you're asleep, you want the house to cool down and think it's "unoccupied" anyways with a more energy efficient profile.

Also the motion sensors can be useful for automations (I have them trigger things like night lights) and even notification for alarms if you're savvy enough.
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Nov 22, 2003
3564 posts
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These should be $5-10 max. Having to replace the batteries every year or so only makes them even less of a good deal to invest in. I'd be happy to plug in a permanent sensor in each room (right into a wall outlet or perhaps a usb port) but no way I'm paying this for what is a device that probably costs less than a dollar to manufacture. Maybe there are cheap third party sensors that can spoof these - surprised Xiaomi hasn't already made some.
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Nov 21, 2011
2580 posts
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Parksville, BC
txenglan wrote: These should be $5-10 max. Having to replace the batteries every year or so only makes them even less of a good deal to invest in. I'd be happy to plug in a permanent sensor in each room (right into a wall outlet or perhaps a usb port) but no way I'm paying this for what is a device that probably costs less than a dollar to manufacture. Maybe there are cheap third party sensors that can spoof these - surprised Xiaomi hasn't already made some.
Most ali or b***good motion or temp sensors are $10-$15 each. Not a huge price diff given these will work out of box. Wall outlets aren't ideally placed for either motion or temp. I agree that using non-rechargeable batteries suck.
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Nov 29, 2007
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txenglan wrote: These should be $5-10 max. Having to replace the batteries every year or so only makes them even less of a good deal to invest in. I'd be happy to plug in a permanent sensor in each room (right into a wall outlet or perhaps a usb port) but no way I'm paying this for what is a device that probably costs less than a dollar to manufacture. Maybe there are cheap third party sensors that can spoof these - surprised Xiaomi hasn't already made some.
These are the new models with 4yr battery life, quicker response to heat and IR.

Thanks OP!
Grabbed a set for the cottage. I needed another couple.
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Nov 29, 2007
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flopticalcube wrote: I agree that using non-rechargeable batteries suck.
Rechargeable batteries are not very good for this kind of minimal draw/time condition.
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Jun 10, 2016
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I never understood the purpose of these sensors without a gated vent (that automatically opens and closes) - especially if you're trying to be frugal.

My upstairs rooms are always about 5C lower than the main floor. Sure, if I set the upstairs temperature to be comfortable (higher) during bedtime, that would mean that the main floor would probably heat up 5C higher than I would like, wasting quite a lot of energy. The other option is to manually shut the vents every night - which is a hassle in itself...
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Nov 21, 2011
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pooper wrote: Rechargeable batteries are not very good for this kind of minimal draw/time condition.
I didn't realize these were low power with CR2032 batteries. Most Chinese sensors take the CR123A at $5 a piece. Makes it even better!
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flopticalcube wrote: I didn't realize these were low power with CR2032 batteries. Most Chinese sensors take the CR123A at $5 a piece. Makes it even better!
The old sensors take the CR2032.
These new smart sensors use CR2477's. That's why they can last 4yrs.
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Nov 21, 2011
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pooper wrote: The old sensors take the CR2032.
These new smart sensors use CR2477's. That's why they can last 4yrs.
Ok. If it lasts 4 years its not an issue then.
Member
Oct 2, 2019
313 posts
198 upvotes
GavinCampbell wrote: The first thing I do before adjusting though is make sure the sensors are in a correct spot in the room. I sit it next to wear people would be sitting. The reason being is the temperatures around the room itself are different. In my family room I had it on a shelf higher up and it was always warmer so the room felt colder than expected.

You can adjust the dampers in the basement to adjust them amount of air flowing to the floors (I wouldn't close any of them though) and that will help. Then in each room you can open/close the registers. You they should also have a damper at the register itself. Give a day or so and recheck the temperatures.

My office is always going to be a pain because of the computers in it, so I just exclude it from any sort of temperature calculations.

You can also adjust the fan cycle so it runs more. This will help circulate the air. I opened the return in the basement and in the summer this helped cool upstairs and warm the basement up by cycling the cold air from downstairs to upstairs. In the winter you would probably want the opposite.

Of course I'm not a pro and this works for me, but there are a bunch of articles and videos on the web that can explain it in more detail if needed.
I don’t need the sensors then? Just get any 2 $4 thermometer at dollarama and put one in the basement and one upstairs, then follow your instructions?
Sr. Member
Jan 15, 2010
523 posts
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Toronto
k847848 wrote: I don’t need the sensors then? Just get any 2 $4 thermometer at dollarama and put one in the basement and one upstairs, then follow your instructions?
Ya. If you just want to balance things out (it will never be perfect but will help). If you want to do any other automations with the ecobee the sensors are worth it.
Sr. Member
Dec 27, 2007
689 posts
469 upvotes
GavinCampbell wrote: You wouldn't use that feature at night. Instead you would have its night mode only monitor the sensors in the bedrooms (or whatever rooms you want) to ensure its the right temperature. You do want to make sure these rooms are balanced in temp though or one will be much warmer or colder than the other. I disabled the follow me feature as I didn't like it.

Instead, I use them (along with other sensors) to just help me balance out the house to level out the temperature. You don't have to use the ecobee sensors specifically for this but it makes a difference in the overall comfort of the house. I've even done it at my mothers place and she noticed a big difference in the overall feel of the house.
I am not sure if I get it. Let's say the house is normally at 22c in upstair and 24c in the main level where the thermoste locates, how can the sensor help you to bring upstairs to 24c, and lower the main level to 22c? I would think the result will be 24c at 2nd floor 26c at the main since it's a full house furnace.
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Jul 11, 2008
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hiker007 wrote: I am not sure if I get it. Let's say the house is normally at 22c in upstair and 24c in the main level where the thermoste locates, how can the sensor help you to bring upstairs to 24c, and lower the main level to 22c? I would think the result will be 24c at 2nd floor 26c at the main since it's a full house furnace.
This actually depends on your furnace and how many stages it has but essentially you are right. There will be fluctuation everywhere.

Some furnaces can ‘trickle’ heat to creep up the heat and allow it to disperse more evenly, but others are full on. In the full on scenario you would get warmer than intended zones.

The best part of this feature is the ability to not have to worry about some rooms that are generally warmer in summer but cooler in winter, and are not used a lot. When the sensor detects occupancy, it knows that it needs to warm that zone and will try. When you leave, it stops. This is of course if you set it that way.

Also, when you go to a cool bedroom it will also try to warm it.

The occupancy sensor is very good. But as stated before, you can even out your overall comfort too, but how well this will work depends on your furnace as well. If you have a newer multistage furnace you will definitely feel a difference in comfort with the ECOBEE 4 and sensors.

The thermostat can even decide to run the fan and cold air return to distribute heat the house already has more evenly, using the sensors.
Sr. Member
Jan 15, 2010
523 posts
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Toronto
hiker007 wrote: I am not sure if I get it. Let's say the house is normally at 22c in upstair and 24c in the main level where the thermoste locates, how can the sensor help you to bring upstairs to 24c, and lower the main level to 22c? I would think the result will be 24c at 2nd floor 26c at the main since it's a full house furnace.
The sensors won't do it for you. They are just for information. A few posts above I mentioned how I even out my place by adjusting dampers registers and a few other things. Its not perfect but it gets close and the overall comfort feels much better. You can't really account for things such as sun position but it helps. I've done this at my place and my parents place to balance things out a bit and it really helped. Also wired in my humidifier to help with the house humidity. That made things feel better as well.

I don't use the follow me (or presence detection) feature out of preference. For some reason it just threw things off. I'm not a fan of it. At night the routine only monitors my bedroom temperature (I don't care what the rest of the house is at).

You just have to adjust and play with things and understand how the thermostat works with the sensors and you can get things to how you like it. Everybody is different.
Newbie
Aug 5, 2010
53 posts
13 upvotes
Just received mine today.
No notice of when the order shipped.

This changed my thermostat completely.
I'm pretty happy with them.
And they're surprisingly smaller than I thought
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Nov 21, 2011
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Got a shipment email. Estimated delivery by Monday.

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