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Thread: HRV vs ERV
08-29-2011, 11:12 PM #1New Guest
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- Aug 2011
HRV vs ERV
I need some help deciding on ventilation for my basement ~1700sq feet.
I do have moisture problem in the basement (no leaks) that contributes to the musty smell, which is bothersome. I wold like to use the space and finish the basement. I should also mentioned is that basement does not have air return with central HVAC, the exhausts are present though.
I do plan to waterproof in the next few years, but for now I think good ventilation system might help.
the house is in Cleveland, Ohio
I need help deciding whether I need to use HRV or ERV unit, and the size of the unit.
Also my thinking is to have separate ventilation system for the basement and not the one tied into central HVAC.
08-30-2011, 08:33 AM #2
See the link below
they have some good resources for home owners when re-searching HRV/ERVs
if you have a leaky or moist basement, the first thing I think of is an old house, old windows, doors and no vapor barrier. If thats the case, you typically wouldn't be a candidate for either an HRV or ERV. these are typically only recommended in a home built or retrofitted with tight construction techniques and a continuos vapor barrier.
neither HRVs or ERVs actively remove or add moisture to your house, all they do is exhaust building air outside, and bring in fresh air, the only catch is that it runs both through a heat exchanger to recover some of your heat back (HRV) or some of your moisture (ERV) back to make them more efficient than opening a window.
I guess how leaky is your basement? running mechanical ventilation in the winter will bring in nice and dry air that my help dry things out a bit, but could running your home fan all winter long help bring some of the humidity up stairs where you want it?
running mechanical ventilation in the summer likely wont help our your moisture problem much (unless it is really bad), as outdoor air is quite humid, do you have AC? could you get an AC tech in to check over the system, tell him you want it do de-humidify the air as much as possible, he could make some system adjustments to do so
maybe some basement fans and a de-humidifier is all you need?
08-30-2011, 09:46 AM #3
When the outdoor dew points decline to less than 50^F, outside will make the space dry. As you see the moisture problems go away when the outside air is dry during cold weather. Most homes will benefit from basement dehumdification throughout the summer months. I suggest that you use basement dehumidification in your home when ever the windows are closed and the home is damp.
Regards TBBear 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"