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Safe to run circulation fan all night?

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Safe to run circulation fan all night? M 05-27-2008
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Posted by HeyBub on May 29, 2008, 9:06 pm
Nate Nagel wrote:
>>> In the summer you definitely don't want to run the fan all the
>>> time. When the compressor cuts off there is still a little water on
>>> the coils. If you keep the fan running, this water is evaporated and
>>> inceases the humidity of the living space.
>>>
>>> Summer or winter, the fan does consume some energy.
>>>
>>
>>
>> The blower is, what, 1/4HP? That's about 200 watts. Running for ten
>> extra hours in a day is 2 kwh. At 15c per, that's thirty cents a
>> day, $9.00 a month. To keep the temperature relatively constant.
>>
>>
>> Plus, keeping the temperature constant via continued circulation
>> doesn't make you think you're going through the hot flashes of
>> menopause. Peace of mind is worth something.
>>
>>
>
> In my house the basement is consistently cooler than the second floor.
> Keeping the fan running makes both more comfortable. Certainly beats
> running the A/C cost wise. I left the fan running when I left for
> work this AM and it was close to 80 degrees out when I got home. The
> house was about 70 degrees inside, had the A/C set for 77 degrees, so
> obviously it never kicked on all day. (I must admit that it was cool
> last night so the inside temp. was about 66-67 degrees when I left,
> because I'd had the windows open and a big window fan running to cool
> it off before I went to bed.)
>
> I'm sure that if I *hadn't* had the fan running it would have been at
> least 75 upstairs if not higher - I can say this because I didn't have
> the central A/C last year and just had a mercury thermostat with no
> fan switch, so I didn't have the option of leaving the fan running.
>

Right. You have a basement that acts as a heat sink, storing up coolness
which you can pipe to the rest of the house.

We don't have basements where I live: the city sits on 500 feet of mud
(well, clay - same thing).



AppliancePartsPros.com, Inc.
Posted by ransley on May 29, 2008, 9:13 pm
> HeyBub wrote:
> > John Gilmer wrote:
>
> >>>Hubby is wrong. I do it all the time, and nothing has broken for
> >>>years. It's suggested to run the fan all the time during the heating
> >>>season, this eliminates the high and low temps when the system is
> >>>cycling on and off. Run
>
> >>Believe it or not, the circulation fan (if it's a standard 3-speed)
> >>uses a fair amount of electricity.
>
> >>When the heat is off but the fan is on you are blowing about unheated
> >>air. I just don't see how that helps anything.
>
> >>In the summer you definitely don't want to run the fan all the time. Whe=
n
> >>the compressor cuts off there is still a little water on the
> >>coils. =A0 If you keep the fan running, this water is evaporated and
> >>inceases the humidity of the living space.
>
> >>Summer or winter, the fan does consume some energy.
>
> > The blower is, what, 1/4HP? That's about 200 watts. Running for ten extr=
a
> > hours in a day is 2 kwh. At 15c per, that's thirty cents a day, $9.00 a
> > month. To keep the temperature relatively constant.
>
> > Plus, keeping the temperature constant via continued circulation doesn't=

> > make you think you're going through the hot flashes of menopause. Peace =
of
> > mind is worth something.
>
> In my house the basement is consistently cooler than the second floor.
> Keeping the fan running makes both more comfortable. =A0Certainly beats
> running the A/C cost wise. =A0I left the fan running when I left for work
> this AM and it was close to 80 degrees out when I got home. =A0The house
> was about 70 degrees inside, had the A/C set for 77 degrees, so
> obviously it never kicked on all day. =A0(I must admit that it was cool
> last night so the inside temp. was about 66-67 degrees when I left,
> because I'd had the windows open and a big window fan running to cool it
> off before I went to bed.)
>
> I'm sure that if I *hadn't* had the fan running it would have been at
> least 75 upstairs if not higher - I can say this because I didn't have
> the central A/C last year and just had a mercury thermostat with no fan
> switch, so I didn't have the option of leaving the fan running.
>
> nate
>
> --
> replace "roosters" with "cox" to reply.http://members.cox.net/njnagel- Hid=
e quoted text -
>
> - Show quoted tex
Humid air even if cool is uncomfortable, a basement can add a big load
to the AC even if its cool because of its humidiy, but every house is
different.

Posted by John Gilmer on June 20, 2008, 9:49 pm


>
> The blower is, what, 1/4HP? That's about 200 watts. Running for ten extra
> hours in a day is 2 kwh. At 15c per, that's thirty cents a day, $9.00 a
> month. To keep the temperature relatively constant.

You are assuming the motor is fairly efficient. These three speed motors
aren't designed for efficiency. The 1/4 or 1/3 hp rating is what's deliverd
to the fan.

If you have a well balanced system, the most heat is delivered to the rooms
that have the most heat loss.

The air you circulate when the furnace is off will be a room temperature.
All you fan is doing is creating drafts.

>
>
> Plus, keeping the temperature constant via continued circulation doesn't
> make you think you're going through the hot flashes of menopause. Peace of
> mind is worth something.

I don't see how creating drafts would bring much peace of mind. Folks
with gas heat typically pay less than $100/month for electric in winter.
So your "peace of mind" is adding 9% (using your number) to you electric
bill.

>
>


** Posted from http://www.teranews.com **

Posted by on June 20, 2008, 11:42 pm
I have a ridge vent on a roof that was installed in late 01 along with
the 3 existing gable vents. They all went through 3 hurricanes in 13
months. No problem..

If anything, one of the gable vents had some wind driven rain come in.
Fema solved this with a vent shutter..


Posted by Clint on May 27, 2008, 6:55 pm

>
> Hello,
>
> I have central air and a gas furnace for heating, and I believe one
> system controls the air circulation. When it gets hot out, the a/c
> doesn't cool the upstairs well. My thermostat has the option to keep
> the circulation fan on all the time, not just when the AC (or heat)
> turn on. I believe this will help a great deal, but hubby says it
> isn't built for that and we will break something. Is it safe to run
> the circulation fan all night, or should I save that for more
> conventional house fans?
>
> Thanks,

It might be safe but it could also be more expensive.



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