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Thread: ERV or HRV in Northern Virginia
10-26-2007, 09:35 AM #1Regular Guest
- Join Date
- May 2005
ERV or HRV in Northern Virginia
I relied on advice from this forum several years ago when replacing my furnace/AC in a 60-year-old house with a Carrier Infinity system.
I'm about to build a new home in Northern Virginia. I've already specified to the builder that I want two zoned Carrier Infinity systems, one unit divided into zones for basement and first floor, and another unit with three zones for 2nd floor, master bedroom, and finished attic.
In my old, poorly insulated/sealed house, we needed a humidifier in the winter. Based on my research, a tight new house often has the opposite problem of high humidity, even in the winter.
I'd like to use an HRV or ERV for fresh air, but I'm confused about what's needed in my climate. For an older house, it seems as though an ERV would be better in winter to keep indoor humidity higher, but perhaps a tighter house would need an HRV to keep winter humidity lower? An ERV is obviously preferable for summer.
What should I specify? Or should I go a year without a humidifier or HRV/ERV and see whether humidity is too high or too low in the winter, and then choose?
10-26-2007, 12:36 PM #2Member
- Join Date
- Jun 2004
You fall into zone C which includes areas as far north as Harrisburg, which recommends you go with an ERV. I highly recomend them in many new homes as they continue to get tighter. But they can always be added down the road for a little extra cost, so way your options and see whats best for you.
10-29-2007, 02:50 PM #3Bear 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"