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Need advice on a accurate, programmable thermostat #5456744 06/18/20 09:43 AM
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sasilverbullet Offline OP
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I'm looking for one that if it's set at 77, then at 78 it will turn the A/C on, and when it's 77 again turn it off.

The one I have now doesn't turn on until the temp is 2 degrees higher. Then it runs the A/C for what seems like forever.

Here's one I had at my last house and it seemed accurate. Do you guys concur getting this will solve my problems?

[img]https://www.homedepot.com/p/Honeywe...ogrammable-Thermostat-RTH8500D/100295793[/img]


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456779 06/18/20 10:17 AM
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shanneba Offline
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I have a Lux TX100e. It has the ability to set the "temperature swing" from +- 0.25 default) up to +- 2.25 degrees.
Maybe your current thermostat can also be adjusted?

I have it set for a +- 1.0 degree swing, the heat comes on at the set point -1 degree, goes off at set point +1
the A/C comes on at the set point +1 degree, goes off at set point -1


https://www.homedepot.com/p/Lux-7-Day-Manual-or-Programmable-Thermostat-TX100E-006/206605731


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456785 06/18/20 10:23 AM
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PowerSurge Offline
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Your current thermostat may have an adjustable swing setting. Meaning you can adjust how close to the set temperature the system will come on. If not, the Honeywell you linked is a great stat. That model is very high quality that will last for years. LUX brand thermostats are a cheaper alternative but are also well built. This one does not have a touchscreen, though:

https://www.amazon.com/Lux-Thermostat-selectable-universal-compatability/dp/B00F19KW0S/ref=sr_1_7?crid=1WDZPOTP9JYD3&dchild=1&keywords=lux+digital+thermostat&qid=1592493714&sprefix=Lux+dig%2Caps%2C160&sr=8-7


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456788 06/18/20 10:25 AM
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Hall Offline
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I thought most thermostats operated similarly and one reason is to avoid having the AC (or furnace) cycling on and off too frequently.

On the unit you linked to, I see nothing that indicates it will operate like you want (I looked at the operating manual too). If your AC "runs forever" to drop 2º, I think your AC is more to blame (too small) than the thermostat.

Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456855 06/18/20 11:22 AM
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Donald Offline
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I think a 2 F degree swing is reasonable. You do not want your HVAC cycling all the time, it will shorten the life.


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456889 06/18/20 11:52 AM
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Rand Offline
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you would hate my window AC then it has 4 degree swing..

2degrees is pretty much industry standard.


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456910 06/18/20 12:16 PM
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dinofish Offline
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Our Honeywell does what you want it to do, but ours is a bit older than the one you have linked. And no, it doesn't cycle all the time with this type of setting. But then again, I turn the A/C off during the day, and only turn it on at 6pm when everyone is back in the house.

Re: Need advice on a accurate, programmable thermostat [Re: dinofish] #5456916 06/18/20 12:22 PM
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terry274 Offline
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Originally Posted by dinofish
I turn the A/C off during the day, and only turn it on at 6pm when everyone is back in the house.


The OP is in Texas, turning the AC off is probably not gonna happen.


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456943 06/18/20 12:45 PM
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Kawiguy454 Offline
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That hysteresis/differential of 2 degrees is what you want. The AC should not be cycling on and off constantly. Keep in mind that a properly sized AC unit is SUPPOSED to stay on a lot. One of its main jobs is to remove humidity making it comfortable. An oversized AC unit with small differential temp will not get rid of very much humidity while adding wear to the ac unit.

Re: Need advice on a accurate, programmable thermostat [Re: terry274] #5456954 06/18/20 12:59 PM
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sasilverbullet Offline OP
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Originally Posted by terry274
Originally Posted by dinofish
I turn the A/C off during the day, and only turn it on at 6pm when everyone is back in the house.


The OP is in Texas, turning the AC off is probably not gonna happen.


+1 Cheers2


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456984 06/18/20 01:46 PM
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dinofish Offline
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Originally Posted by sasilverbullet
Originally Posted by terry274
Originally Posted by dinofish
I turn the A/C off during the day, and only turn it on at 6pm when everyone is back in the house.


The OP is in Texas, turning the AC off is probably not gonna happen.


+1 Cheers2

If you are not turning it off during the day, I would keep it at the two degree setting. I agree with others that continuous turning on and off is probably bad. Maybe you can try setting it at a lower temperature like 75 degrees?

Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5456998 06/18/20 02:06 PM
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Pablo Offline
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I thought a Nest would help in a similar situation. "Oh it will learn" people said. That thing has no more intelligence than a post. A simple thermostat would be better, IMHO.


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Re: Need advice on a accurate, programmable thermostat [Re: Pablo] #5457033 06/18/20 02:55 PM
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Originally Posted by Pablo
I thought a Nest would help in a similar situation. "Oh it will learn" people said. That thing has no more intelligence than a post. A simple thermostat would be better, IMHO.


Agreed. Our new house came with a Nest. Disabled the “auto learn” feature. Otherwise it’s great. If we leave I just turn on eco or crank the temperature up or down respectively, and turn it back to where I want it when we are leaving to go back home.


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5457057 06/18/20 03:27 PM
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CDX825 Offline
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Get a Pro 1 T 705 stat. They are reasonably priced and you can adjust the swing setting.


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Re: Need advice on a accurate, programmable thermostat [Re: sasilverbullet] #5457373 06/19/20 12:25 AM
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Nick1994 Online Content
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I've got a Braeburn 2000NC that I put in in 2016, probably a newer version out by now. It lets you set the temperature differential at 0.5, 1, and 2 degrees. I keep it at 1.

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