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The bottom floor of our house is serviced by 2 4 ton units (one west, one east). The second floor has its own unit.
Just in the last 2 days, I have noticed the west side of our home is more humid than the west side. This unit just had a TPX valve replaced (diagnosis confirmed by 2 different HVAC companies). It was done a week before I noticed the problem.
To muddle the situation, 2 days ago we started the 3-4 day process of having our roof replaced. They did start on the west side of the house. And the weather was insanely humid yesterday.
I have also noticed the fan (which is on auto) seems louder than it used to...at least initially or once in a while.
It is cooling just as well as ever, but this new humidity is unpleasant as heck.
Humidity in the house moves (or doesn't) as the air moves (or doesn't). It sounds like the work you've done, possibly a combination of the HVAC work and a change in how the house heats during the day caused by the roof work, could have changed air movement in the house.
Go to a home store (Home Depot, Lowes, even Walmart) and get three inexpensive hygrometers (humidity meters). Get three because they're cheap and between three of them you should get two that agree. Place them in different areas of the house to determine exactly what the difference is and where it is.
You may be surprised to find dead-air regions where the humidity is significantly different even in the same room. For instance, it's not unusual to find the corners of a room near the floor are significantly more humid than the center of the room.
Could be that the unit is oversized. A larger unit will cool faster, but won't remove much more humidity in a given amount of on-time. So it'll run less and leave the air more humid.
Could be that the unit is oversized. A larger unit will cool faster, but won't remove much more humidity in a given amount of on-time. So it'll run less and leave the air more humid.
I've read that, but the other side of the house is serviced by 2 4 ton units (one upstairs and one downstairs) and there is no trouble.
Plus we've lived here more than 5 years and this is the first time we've experienced this.
Part of the system's capacity lowers the sensible temperature while the remaining part of the capacity removes moisture and the volume of air that crosses the cooling coil dictate what those proportions are. Move more air and the system will do more temperature lowering work which suits an arid climate. Slow the air flow down and more moisture is removed benefiting a muggy climate. The change in fan noise/speed last week may have something to do with the air quality.
I'd have to give the west side only condition some consideration as to why there. The west side would be warmer in the PM and with the same level of moisture in the air should have a lower RH. With the sun down, all should be equal. Hmm...interesting.
Part of the system's capacity lowers the sensible temperature while the remaining part of the capacity removes moisture and the volume of air that crosses the cooling coil dictate what those proportions are. Move more air and the system will do more temperature lowering work which suits an arid climate. Slow the air flow down and more moisture is removed benefiting a muggy climate. The change in fan noise/speed last week may have something to do with the air quality.
I'd have to give the west side only condition some consideration as to why there. The west side would be warmer in the PM and with the same level of moisture in the air should have a lower RH. With the sun down, all should be equal. Hmm...interesting.
Are the ducts running through the attic space? Is it possible a duct got damaged?
Yes, there are ducts running through the attic.
I know none were damaged during the Txv valve replacement.
I will go up in the attic and check.
Last edited by stan4; 05-27-2016 at 10:11 AM..
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