Humidity control in winter
I live in Texas where it is always humid. We can be at or below freezing and the humidity can be 80%. So no bathroom vent fans or cooking or whatever is not to blame in fact if you run them you will increase the indoor humidity by pulling in air with more humidity than is being sucked out of the house....
Unfortunately there is little done in this field because 99.999% of home performance research and information is into the simple act of keeping a house warm in a cold climate as the researchers only tackle the low hanging fruit... Our house is roughly 1700sqft and I need a few recommendations on dehumidifiers that are relatively quiet and efficient. Unless someone knows of some other magical way of reducing indoor humidity. Looking for a real dehumidifier not one of those peltier junction ones that barely removes any moisture. Oh and recently we have gone from the low 40s up to 79* yesterday (warmer today) and all that time the lowest the humidity has been is 87%. It's 56* right now and 99% humidity.... Yeah nasty sticky weather. I miss growing up in Hawaii where the air was drier... |
I am a big believer in ERVs. Condition the house and an ERV allows ventilation without pulling in humidity.
In central Oklahoma, where I live, May and June have oppressive humidity. The below suggestions allow me to keep house humidity below 55%. A good dehumidifier can lower humidity, but watch out for dryers in the conditioned space. They suck out 300-600 ft3 per minute. That will evacuate a house of conditioned inside air with just one dryer run. 1) Button up house (to reduce air infiltration) 2) use a good dehumidifier or properly sized AC unit) - or both 3) install ERV that runs at low speed (20-40 ft3/min) all the time |
My problem with humidity is in the winter. There is no dry air inside or out so it doesn't matter how well the house is sealed since I have nothing inside the house running in the winter to remove moisture other than the fridge which there is no easy way to put a drain hose on the pan and drain it out of the house...
Right now its 35* and the humidity is 90% hence why I need a dehumidifier in the winter. I't humid year round here with only a few exceptions of the odd dry cold front in the winter but that only stays dry for a day. |
Read up on how relative humidity works and therefore why HRVs do work as dehumidifiers during the winter.
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Mike, hrv or erv? And why . . . .
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I have two standalone dehumidifiers (one for each floor) and have never had trouble with them. They use AC compressors and consume about 700W. It isn't really wasted heat when you are heating the house anyway.
Mine can each remove about four gallons of water a day. We turn on the downstairs unit when hanging clothes to dry. The upstairs unit rarely gets used. Edit: Forgot to mention, this type of dehumidifier works best if you turn the dial all the way up so it runs continuously until the tank is full. When it shuts off, empty the tank and let it run again if the air is still damp. Don't forget to wash the tank occasionally or you will have mold and bacteria growth. |
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Not to mention I have nowhere to put an HRV and running the inlets and outlets would be even more difficult. Unfortunately we don't have basements nor a massive attic to place a unit. The only location would be in the garage then cut holes in the brick for two vents then pop into the attic and tun those lines across the garage to the house. Just doesn't work well in most houses here for a retrofit. We also don't have mechanical rooms either. |
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This is from Venmar, they manufacture both HRV and ERV: Quote:
Best, -AC |
There seems to be a misconception about relative humidity here. Your 35 degree saturated outdoor air contains less than 30% relative humidity at 68 degrees. It's all about dew point.
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Perhaps it is better to use a central air conditioning system with one dehumidifier for the whole house for such humid conditions.
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