Seems to me low 50s in a steamy climate isn't bad. The lowest I set my IAQ for in the summer is 50% dehumidification. Don't run the fan constantly, that hurts overall humidity control.
Be interesting to see what dash or Dan think of this.
I have a 2 year old home in central florida. It is always humid (around 50 to 52 percent RH). I have measured humidity in other homes (friends and relatives) and they always measure in the very low 40's.
It seems damp to me and setting the AC on 75 degrees is just too hot in the home.
Do I have a problem or does this sound normal ??
Seems to me low 50s in a steamy climate isn't bad. The lowest I set my IAQ for in the summer is 50% dehumidification. Don't run the fan constantly, that hurts overall humidity control.
Be interesting to see what dash or Dan think of this.
Bet you can guess what Teddy Bears response will be.
bear says 45% But I still wouldn't lose sleep over 50%. With a TXV coil and Comfort R turned on I stayed in the low 50s. Without a dehum, might be hard to do that much less.
I got an old A/S belt drive oil furnace. 2.5 ton Armstrong A/C.
With a lot of playing with it, I got it to hold 48%.
Runs longer, but feels a lot better. Barely 330 CFM per ton.
Of course, I have to reset the blower for each season.
How or what are you using to get your % of humidity? Most of Central and South Florida homes should run 50% humidity and approximently 75*. Unless using a psychrometer, I would not trust those numbers you gave. Unit model and serial numbers and what is your sq footage? Do you leave inland or on the coast?
Too Few Pro Tech's & Too Many Parts Changer's.
i could go into a 1000 word page about hum. but bottom line- the lower the hum. the more comf. you feel in the sumertime. 75 is cool. 70 is hot and sticky. 75 with hi hum. is hot and sticky
i am curious how fan on all the time hurts hum. in homes. fan on is allways good. cost a little more but the benefits are worth it
it seems to me your a/c is oversized. it has to run long enough to take out the hum. if its oversized you will get 70 deg.70 PER. hum. way to high., cool but hot. your sweat is your bodys a/c sys. sweat evaps. off youe skin to cause a cooling effect. the air will only hold so much water.IF YOU HAVE 10 PER. HUM. THE MOISTER EVAPS. OFF YOUR SKIN FAST-COOLING YOU. IF YOU HAVE 90 PER.HUM.THE MOISTER EVAPS. SLOW BECAUSE THE AIR ONLY HOLDS 100 PER HUM. THE SOLWER THE EVAP,THE WARMER YOU FEEL. THATS WHY WE ADD HUM. IN THE WINTER. YOU CAN FEEL GREAT IN THE WINTER AT 68DG. -60 PERCENT HUM. OR COLD AT 75 DEG. 40 PERCENT HUM.
You Did Not Give Your Sq. Footage Verses A/c Tonage. It Can Be Fixed
Model numbers and what is being used to measure the humidity.
Leftover Humidity Can Only Cause Prob. ----get Rid Of It... Mildew-- Mold. Algae---get Rid Of It!!!!!
Kixtusjon Who Are You . I Am Donnie Bates Dalton Ga.
Yes- Fan On Causes Water And Hum. To Be Added To Your House. But If It Does ,your A/c Sys. Has Been Sized Wrong!!!!
??? When an a/c condenser shuts down and the fan is in auto, is there moisture on the coil or in drain pan??? If so, when the fan is on and condeser off, the moisture will start to evaperate back in to the air because of the air coming back to unit will be higher in temp than the air that left the moisture when it left the coil. And what does my name have to do with anything here? If you don't agree with me thats fine. It does not effect me in anyway.
Last edited by KirtusJon; 03-31-2008 at 10:35 PM.
Too Few Pro Tech's & Too Many Parts Changer's.
With the low cooling loads in FL, 50%RH sounds good to me. Like a lot of the rest of the posters-- what are measuring the %RH with? Do not totally trust any meter. At 75^F, 50% RH, Any cold surface below 54^F will fog. A good thermometer may be easier to come by than a accurate %RH meter. Another way to check %RH is to measure the temperature of water that fogs a shiney bowl. First calibrate your thermometer with crushed ice (32^F). Slowly cool a bowl of warm water with ice until the bowl fogs. The temp of water at foging is the dew point. Plenty of info on web to figure the %RH from the air temp and the water foging temp.
If you are getting enough fresh air in your home and the a/c is not running much, the dew point in your home is higher than outside. Here comes my line so I don't disappoint. Homes in green grass climates with adequate fresh air need supplemental dehumidification to maintain 50%RH during shoulder a/c season. OK Regards TB
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"