My a/c sometimes doesn't seem to run/stop when it's supposed to. On a hot day it is a couple of degrees off. Which thermostat do you sell for a 24 year old mobile home?
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Thanks!
Central a/c ? for contractors
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I don't understand your question. Are you saying that your thermostat isn't turning the unit off when it should? Or are you saying that the accuracy of the thermometer on the thermostat is poor?
Most thermostats will go a degree or two on other side of the set temperature to prevent constant cycling of the unit on and off. So if you have it set on "COOL" and at 74, it'll switch on at 75 or 76 degrees, and stay on until it cools down to 73 or 72 degrees. Newer ones are programmable, to allow a wider (or narrower) range in temperatures. If you have an old mechanical thermostat, it may simply be getting lazy.
Most thermostats will go a degree or two on other side of the set temperature to prevent constant cycling of the unit on and off. So if you have it set on "COOL" and at 74, it'll switch on at 75 or 76 degrees, and stay on until it cools down to 73 or 72 degrees. Newer ones are programmable, to allow a wider (or narrower) range in temperatures. If you have an old mechanical thermostat, it may simply be getting lazy.
Originally Posted By: Hokiefyd
I don't understand your question. Are you saying that your thermostat isn't turning the unit off when it should? Or are you saying that the accuracy of the thermometer on the thermostat is poor?
Most thermostats will go a degree or two on other side of the set temperature to prevent constant cycling of the unit on and off. So if you have it set on "COOL" and at 74, it'll switch on at 75 or 76 degrees, and stay on until it cools down to 73 or 72 degrees. Newer ones are programmable, to allow a wider (or narrower) range in temperatures. If you have an old mechanical thermostat, it may simply be getting lazy.
+1
Also, some thermostats show the actual temp and others just show the set temp. once it is reached, sort of like a dummy coolant temp gauge.
I had one programmable thermostat that would show the actual temp and my wife was constantly bugging me why the AC is not kicking ON when the temp shown was higher than the set temp.
I exchanged that thermostat for a Honeywell one. On this thermostat once the set temp is reached the reading doesn't change.
I don't understand your question. Are you saying that your thermostat isn't turning the unit off when it should? Or are you saying that the accuracy of the thermometer on the thermostat is poor?
Most thermostats will go a degree or two on other side of the set temperature to prevent constant cycling of the unit on and off. So if you have it set on "COOL" and at 74, it'll switch on at 75 or 76 degrees, and stay on until it cools down to 73 or 72 degrees. Newer ones are programmable, to allow a wider (or narrower) range in temperatures. If you have an old mechanical thermostat, it may simply be getting lazy.
+1
Also, some thermostats show the actual temp and others just show the set temp. once it is reached, sort of like a dummy coolant temp gauge.
I had one programmable thermostat that would show the actual temp and my wife was constantly bugging me why the AC is not kicking ON when the temp shown was higher than the set temp.
I exchanged that thermostat for a Honeywell one. On this thermostat once the set temp is reached the reading doesn't change.
this
"Are you saying that your thermostat isn't turning the unit off when it should?"
and this
"If you have an old mechanical thermostat, it may simply be getting lazy."
"Are you saying that your thermostat isn't turning the unit off when it should?"
and this
"If you have an old mechanical thermostat, it may simply be getting lazy."
I suspect that your system uses standard thermostat wiring, and you'd be able to upgrade it with an inexpensive digital thermostat from a hardware store or a big box store. Thermostat wiring is pretty standard. I've replaced them before in stick-built houses; it's pretty easy, with no special skills required.
This is a very good and affordable electronic thermostat that's a direct replacement for mechanical thermostats on basic heat/cool systems (not for heat pumps or multi-stage AC and furnaces). I had one just like this on my old conventional AC/gas furnace combo as a direct replacement for an old Robertshaw "click" thermostat that had too wide of a dead span:
https://www.acwholesalers.com/Honeywell/...CFVBp7AodwxcASg
https://www.acwholesalers.com/Honeywell/...CFVBp7AodwxcASg
I like that thermostat, thanks. I may have solved my problem tonight, I will know for sure in a couple of days. I pulled the front of the thermostat off the base and saw about 1/2 pound of dust and grime inside, especially on top of the glass tube. Cleaned everything with a soft brush, wind, and alcohol pads. In the 15 minutes it took to clean the thermostat the temp inside rose 5 degrees from 78 to 83. Now it's 78 again.
That didn't fix it. AC still turns on and or off at the wrong time. I was just checking to see if someone had identified the source of my AC problem. Since I'm not sure the thermostat is the problem I'm going to go pick up a basic analog Honeywell unit.
Is this a new issue? Did it do this last year? Thermostats have what is called a cooling anticipator, if your t-stat is set for 75, it will run it down to 74.5 and shut off- not turning back on until 75.5, its not adjustable. If its acting up you will need a t-stat, the heating anticipator can be adjusted - but that's just for heating. These #'s are approximate.
The other things to look at:
Make sure t-stat is not on exterior wall- has to be on interior wall
Make sure the hole behind t-stat for wires is sealed - no wall draft.
Make sure your t-stat is not being hit by draft from any supply vents
Make sure t-stat is as close as possible to your return vent.
The other things to look at:
Make sure t-stat is not on exterior wall- has to be on interior wall
Make sure the hole behind t-stat for wires is sealed - no wall draft.
Make sure your t-stat is not being hit by draft from any supply vents
Make sure t-stat is as close as possible to your return vent.
Then I need to seal the hole behind the base and watch the thermometer some more. The old tstat may be ok.
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