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Timer controlled thermostat Jim 07-11-2007
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Posted by Jim on July 11, 2007, 7:29 am
But I don't mean your run of the mill programmable type.

Presently we are having very warm and humid days. The central air
conditioning handles this properly. Then late at night as the outside
temperature drops the system doesn't call for cooling as often. Once
again this is normal operation.

But during this time the humidity indoors rises. Very good chance the
interior temperature will be stable enough not to call again for air
conditioning for the remainder of the night. Net result being that
sticky feeling.

Wondering if it is possible to find a thermostat, or other computer
controlled device perhaps, that will instruct the air conditioner to
cycle say once every 15 minutes for a 1 minute duration. User
adjustable, to assist in controlling the relative humidity without running
for excessive amounts of time.

Anything like this exist?

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Posted by RayV on July 11, 2007, 8:49 am
> But I don't mean your run of the mill programmable type.
>
> Presently we are having very warm and humid days. The central air
> conditioning handles this properly. Then late at night as the outside
> temperature drops the system doesn't call for cooling as often. Once
> again this is normal operation.
>
> But during this time the humidity indoors rises. Very good chance the
> interior temperature will be stable enough not to call again for air
> conditioning for the remainder of the night. Net result being that
> sticky feeling.
>
> Wondering if it is possible to find a thermostat, or other computer
> controlled device perhaps, that will instruct the air conditioner to
> cycle say once every 15 minutes for a 1 minute duration. User
> adjustable, to assist in controlling the relative humidity without running
> for excessive amounts of time.
>
> Anything like this exist?

While Y'all are pondering Jim's question add this:

A programmable thermostat that allows a timer or cycle setting for the
circulation fan. I have a two story center hall colonial and of
course heat rises so upstairs is always warmer.


Posted by JoeSpareBedroom on July 11, 2007, 8:53 am
> But I don't mean your run of the mill programmable type.
>
> Presently we are having very warm and humid days. The central air
> conditioning handles this properly. Then late at night as the outside
> temperature drops the system doesn't call for cooling as often. Once
> again this is normal operation.
>
> But during this time the humidity indoors rises. Very good chance the
> interior temperature will be stable enough not to call again for air
> conditioning for the remainder of the night. Net result being that
> sticky feeling.
>
> Wondering if it is possible to find a thermostat, or other computer
> controlled device perhaps, that will instruct the air conditioner to
> cycle say once every 15 minutes for a 1 minute duration. User
> adjustable, to assist in controlling the relative humidity without running
> for excessive amounts of time.
>
> Anything like this exist?


Running for such a short time wouldn't give the system a chance to remove
much humidity. It would be like having an AC unit too big for the house.

Is your house "leaky"? My system behaves like yours, but I don't notice
humidity building up. The lack of air movement is bothersome, though, after
the AC stops running at night. So, I have a quiet floor fan in the bedroom,
running on its lowest setting, pointed straight at the ceiling. The brand is
Vornado. Keeps the room very comfortable.

http://www.vornado.com/products/circulators/783b.htm



Posted by Art on July 11, 2007, 12:30 pm
Short cycling a ac wears it out. Bad idea.


> But I don't mean your run of the mill programmable type.
>
> Presently we are having very warm and humid days. The central air
> conditioning handles this properly. Then late at night as the outside
> temperature drops the system doesn't call for cooling as often. Once
> again this is normal operation.
>
> But during this time the humidity indoors rises. Very good chance the
> interior temperature will be stable enough not to call again for air
> conditioning for the remainder of the night. Net result being that
> sticky feeling.
>
> Wondering if it is possible to find a thermostat, or other computer
> controlled device perhaps, that will instruct the air conditioner to
> cycle say once every 15 minutes for a 1 minute duration. User
> adjustable, to assist in controlling the relative humidity without running
> for excessive amounts of time.
>
> Anything like this exist?



Posted by Jim on July 11, 2007, 1:35 pm
Art wrote:
> Short cycling a ac wears it out. Bad idea.
>

For the sake of clarification define short cycling? Only very hot days
it is not uncommon for my scroll compressor to run for say 90 minutes,
shut down, then come back on 10-15 minutes later.

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