Problem with AC unit:Temp really hot in one room only? Help

Posted by RayV on June 22, 2006, 8:20 am

Bob Brown wrote:

> I have a central heating and air conditioning system in my home. I
> bought a digital temp probe, the ones where there is an external
> transmitter. This way I can monitor what the temp is in the living
> room and compare it to my bedroom.
> The living room is on average 73.5F and my bedroom is on average
> 79.5F.
> What is there this much difference? I've already called HVAC tech out
> and he had no answers.
> My one room is 6F hotter than the rest of the house.
> I've tried several things such as.
> 1. Leaving the door wide open for ours, no change
> 2. Putting a fan to suck air from my vent to reach the other side of
> the room, no change.
> 3. Cutting off the computer for 7 hours, no change
> Can someone tell me of a way to fix this problem?
> signed,
> sweaty and desperate

Is the bedroom upstairs and the living room downstairs?

If so, a simple *fix* is to block the return vents downstairs. $4.18
fixed the 'upstairs to hot' in my colonial home. I put those magnetic
register covers on the downstairs return vents. This forces the system
to pull most of the air from the hotter upstairs. A thread a week or
so ago explained that it is not a good idea to block the supply
registers because of the slight possibility of freezing the coil.

Even if you have a single story home blocking the return in the living
room may help the problem if all of your supply registers are working.

Posted by Bob Brown on June 22, 2006, 9:19 am

>Bob Brown wrote:

>> I have a central heating and air conditioning system in my home. I
>> bought a digital temp probe, the ones where there is an external
>> transmitter. This way I can monitor what the temp is in the living
>> room and compare it to my bedroom.
>> The living room is on average 73.5F and my bedroom is on average
>> 79.5F.
>> What is there this much difference? I've already called HVAC tech out
>> and he had no answers.
>> My one room is 6F hotter than the rest of the house.
>> I've tried several things such as.
>> 1. Leaving the door wide open for ours, no change
>> 2. Putting a fan to suck air from my vent to reach the other side of
>> the room, no change.
>> 3. Cutting off the computer for 7 hours, no change
>> Can someone tell me of a way to fix this problem?
>> signed,
>> sweaty and desperate

>Is the bedroom upstairs and the living room downstairs?
>If so, a simple *fix* is to block the return vents downstairs. $4.18
>fixed the 'upstairs to hot' in my colonial home. I put those magnetic
>register covers on the downstairs return vents. This forces the system
>to pull most of the air from the hotter upstairs. A thread a week or
>so ago explained that it is not a good idea to block the supply
>registers because of the slight possibility of freezing the coil.
>Even if you have a single story home blocking the return in the living
>room may help the problem if all of your supply registers are working.

It's a one story home, 1500 sq ft
So you're saying shut off the vents in areas BEYOND my registers?

BTW, My room is the 1st place the air goes which is why nothing makes
sense to me.

So should I try the block off vent deal?
How long before I know it's having an effect?
thanks all

Posted by RayV on June 22, 2006, 9:35 am

> So should I try the block off vent deal?

I would only suggest you try blocking off the *return* vents in the
room(s) that are coolest. This would be to force the system to pull
the air out of the hotter rooms. If your system only has one return
vent, like in a hallway, this would not be an option to try.

> How long before I know it's having an effect?

You should notice a difference in a few hours if it is going to work.

Posted by Bob Brown on June 22, 2006, 9:38 am

>> So should I try the block off vent deal?

>I would only suggest you try blocking off the *return* vents in the
>room(s) that are coolest. This would be to force the system to pull
>the air out of the hotter rooms. If your system only has one return
>vent, like in a hallway, this would not be an option to try.

>> How long before I know it's having an effect?

>You should notice a difference in a few hours if it is going to work.

thanks

Posted by Joseph Meehan on June 22, 2006, 9:36 am

Bob Brown wrote:

Your answer is a new HVAC tech. The one you had ... Well let's say he
may need a refresher course.

There are three possibilities.

1. Insufficient cool air getting to your room.

Check the inflow (volume and temperature) and the return air.
Could there be a problem with the duct work or maybe leaking due to bad
joints or whatever. Lack of proper air return is also an issue, do you get
more cool air coming in if you open the door to the room?

2. Air coming in not cool enough.

Maybe a duct going through an attic with insufficient
insulation.

3. Too much heat load.

Could the room have windows getting a lot of sun, poor
insulation, or over a garage etc.

> My one room is 6F hotter than the rest of the house.
> I've tried several things such as.
> 1. Leaving the door wide open for ours, no change
> 2. Putting a fan to suck air from my vent to reach the other side of
> the room, no change.
> 3. Cutting off the computer for 7 hours, no change
> Can someone tell me of a way to fix this problem?
> signed,
> sweaty and desperate

--
Joseph Meehan

Dia duit

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