Re: Heating a humid home
70 % is way to high especially during the colder temps in the winter .... the colder the outside temps. the lower the humidty inside.
The only time forced air heating tends to dry out things is when the heating system is not direct vented as with high efficient systems.
The mid-efficient furnaces that use a conventional flue for the exhaust draw inside air into the furnace for combustion and that air will continue up the flue to the outside.With this the humidity is reduced.
You might look into having a Heat Recovery Ventilator ( HRV ) or Energy Recovery Ventilator ( ERV ) installed. These units exhaust inside humid , stale air and replacing with fresh outside air while extracting the heat .
These units can be installed as a stand alone or incorporated easily into forced air heating systems.
Just a thought.
"" an ounce of perception -- a pound of obscure "