ERV stands for energy recovery ventilator, HRV stands for heat recovery ventilator. They are both the same operating piece of equipment made by different manufacturers. In most cases there is little to no difference at all.
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On another note. You want to 'lower' the humidity in winter? Winter air is incredibly dry. My house would contract into a little ball if I didn't run a power humidifier on my furnace. What is the cause of the high humidity in your home? ERV systems are generaly used for lowering the humidity in your home in the summer.
your house must leak enough to exchange the dry outside air into your home.
6 in. walls, low e windows, my house is airtight and just the everyday activities release moisture. breathing,cooking,bath,laundry,dishwasher. THere is only one differance that I can see in the two and that is an erv can transfer heat and moisture. hrv can only transfer heat. I figured more people would have these in there homes. As of two years ago they are required by code, in my region.