View Full Version : 70% humidity at 72 degrees with my Trane XL15i and Hyperion- why so humid?
07-04-2012, 08:34 PM
I have a 2 ton system for my upstairs 1100 sqft condo. It usually keeps the humidity around 50-54%. But it was over 90 here today and I am sure it ran for most of the day. Any idea why it is so humid? It feels fine, but I just checked it out of curiosity at the thermostat and it seems pretty high. THanks
07-04-2012, 08:48 PM
tight construction can lead to high humidity... as can low loads. a condo could have low loads due to adjacent homes temps...
also, you could have humidity entering from long fan run times, or dryer usage... cooking loads, extra guests etc...
07-04-2012, 08:49 PM
Fan in the "auto" mode or "on"? During high cooling loads, the a/c should be able to maintain <50%RH. A/c needing surface could be. What is the temp/%RH of the supply air to the space?
07-04-2012, 09:05 PM
Teddy bear, I thought the supply air is the air in the house. THe outside air is 80 degrees with 77% humidity. Inside is 72 with 70% humidity. The fan is on auto.
07-04-2012, 10:33 PM
Supply is the air entering the home from the a/c.
Temp/%RH? Sounds like the system is slowly losing capacity.
07-04-2012, 10:34 PM
The supply air, is the air blowing out of the registers.
Thermostat's humidity sensor may be off. 70%RH at 72 would feel very uncomfortable.
07-05-2012, 06:04 AM
When I woke up this morning it was still 72 degrees, but 51% humidity. Please explain. Thanks.
07-05-2012, 06:10 AM
Get another hydrotherm, and place it near your thermostat.
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