We don't notice a difference with our new HRV system!
Plugged air intake vents are very common and the builder may not have educated you on the equipment in your home. The reason for the HRV or the heat recovery ventilation system is to remove the stale air in your now air-tight home and bring in fresh air to help improve the air quality in your home. In addition, the system can also be helpful in removing excess moisture content in the air. A home inspection is very educational. This is why it is always encouraged that all home-buyers attend the inspection.
I've come across a lot of interesting tidbits of information during my 29 year career as a home inspector. I've been told that I'm pretty meticulous and a good 'teacher', so hopefully you'll find some interesting information here..