I ran into this problem last year where humidity was upwards of 55% in the basement. I installed a Panasonic fan on a dehumidistat which cured the problem (I've never noticed it running).
I weighted this against an HRV and on paper my option was more cost effective and less painful to install.
I've noticed no price increase in power or gas. When I ran a dehumidifier it bumped my electricity bill by about $30 per month to keep up.
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