Humidity problems / Discussions

Eversource told me that my home is too tight  and I need an hrv system. We live in CT and I am not sure where to start. Thoughts?  Well first a clarification – your house may be tight, but is not TOO tight because no house in the world is too airtight. The less air leakage the better, and yes, you should have an HRV to...

...humidity inside my home is still high 50-65% . Furthermore, a contractor recommended installing an air purifying system, adding additional insulation in the attic and refinishing the walls in the basement to reduce humidity and coldness in my home.  Frankly, I am not sure whom to trust anymore, therefore, your guidance...