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Old 07-28-2011, 12:59 PM   #1
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Indoor Humidity at 90%


This is the 2nd summer where mold forms in the toilets and our room temperature is 72-74 with humidity ranging from 85-90%. The winters are much better and we can get humidity down to 50-60%. Why is this happening?

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Old 07-28-2011, 01:17 PM   #2
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Indoor Humidity at 90%


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People are much more likely to respond and give you an appropriate answer if you don't make them play 20 questions. Please provide more information. Where you live, the type of home you have, as well as your HVAC information would be a good start.


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Old 07-28-2011, 03:28 PM   #3
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Indoor Humidity at 90%


OK, will try this again. The HVAC/Heat Pump is Amana Model: ASZ140301, Amana AEPF313716, Amana HKR-10CB, REME + Air purification System and Honeywell thermostat - these were purchsed February 2010 our RUUD had troubles from the start and not that old (this is the second replacement but we have had no trouble with the unit - the cntractor has been out three times to inspect and all is well). We are the middle townhouse about 1000F - three floors in Reston, VA about 20 miles outside of DC which has very humid and hot conditions. The air ducts have been cleaned and a coating put on. I have lung problems so the air/heat is always set at 70. The humidity has been between 85-90% the past few months. The winter was between 55-70. Our bedding always feels damp. Master bathroom forms mold in the toilet a few days after being scrubbed.
Any clue what may be happening? Thank you.
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Old 07-28-2011, 03:33 PM   #4
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Indoor Humidity at 90%


Is the bathroom properly vented, along with your dryer? Are air leaks sealed around windows, doors, outlets, and switches? If the home is too tight, without some way of bringing in outside air, or outside air is being allowed to come in through open doors & windows, that would be the first couple of places to look. Also, has your contractor come back, due to this complaint to do a air quality test to figure out the culprit why you have so much humidity in the air.
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Old 07-28-2011, 03:47 PM   #5
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Indoor Humidity at 90%


The contractor was out a few weeks ago (they come in twice a year) and said everything was fine. The bathroom has a vent that we use when taking showers. The seals on the windows/doors are extremely tight (you can hear the suction when opening). The washer/dryer are also new and vent to outside is new. If I am understanding you, I should have the HVAC folks come back out and do an air quality check - is this correct?
Thank you.
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Old 07-28-2011, 04:34 PM   #6
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Indoor Humidity at 90%


I would do that to make sure that the air quality is not going to cause problems, especially when the hvac system is running. If you hear a change of pressure when opening or closing doors, then the house is too tight, and needs "make" up air. I would start by looking at the culprits (bath, dryer), use a humidistat to measure temp & humidity in various rooms. Radio Shack sells a couple of units that use remote sensors, with a main unit that you can place in the living room.

Your humidity should be around 47 to 62% inside, anything lower or higher can cause problems. If it is short term when the dryer, taking a shower, or running the dish washer, no problem, since it should clear within a half hour or so. You can also check with your local utility if they do any type of home tightness/air quality testing, or local environmental engineering company.

Serv-pro also does this type of work, due to long term high humidity levels are worst, than long term low humidity levels. The higher the humidity, the quicker the building materials break down, and allow mold to grow.
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Old 07-28-2011, 07:34 PM   #7
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Indoor Humidity at 90%


Since you also have high humidity in the winter. Sounds like you may have a problem with moisture coming in through your basement or slab. 2.5 tons for a 1,000 SQ FT center townhouse is a bit much. Specially if its as tight as you say. that 400 sq ft per ton.
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Old 07-29-2011, 12:32 AM   #8
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Indoor Humidity at 90%


As Beenthere has just said,if your a/c is that much oversized then you are getting almost no humidity removed while its running like it should.
90% is very high and it is not healthy.Are you sure of that figure? 10% more and you will have rain in your bedroom.
There is a program that your HVAC contractor can run to find out if you are oversized on thew a/c.The same program can tell you what size furnace you should have.Its called a manuel "J".
From 2000 miles away I see that your a/c is too big and that you have ground water problems letting moisture into your house.
If I am right then its a very expensive repair (replace actually) or you could go with a WHOLE HOUSE dehumidifier to get it down to around 50%.
You can go cheap from one of the big box stores that you have to empty a couple of times a day or get a really good Research Products one from your heating contractor where everything is automatic.
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Old 07-29-2011, 08:55 AM   #9
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Indoor Humidity at 90%


Thank you so much. Will contact the contractor and have them come out. They never went upstairs and only looked outside and at the indoor unit. Thanks again.
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Old 07-29-2011, 09:05 AM   #10
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Indoor Humidity at 90%


Quote:
Originally Posted by beenthere View Post
Since you also have high humidity in the winter. Sounds like you may have a problem with moisture coming in through your basement or slab. 2.5 tons for a 1,000 SQ FT center townhouse is a bit much. Specially if its as tight as you say. that 400 sq ft per ton.
Thanks beenthere. The unit was 10K and we do not have the funds for a new unit as this one is not even 2 years old. My health has been declining again and I am almost convinced it is our home making the asthma worse. I have gages on all floors so the humidity is pretty accurate at 90% in the master bedroom. The basement is a full basement and we have been prone to leaks when the gutter are not cleaned. Thank again for the info.


Last edited by loudounent; 07-29-2011 at 09:11 AM. Reason: sentence not complete
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