I live in a home deep in a coastal redwood forest in Northern California.
The weather in the summer is dry and warm. For around a quarter of the year it drops to 45-55f and rains a lot — often constantly for weeks.
The home is heated with forced air — a new 97%-efficient furnace was installed last year — and a wood-burning stove, which we use most winter evenings. (There's no need for air-conditioning in the summer.) I work from home, so the temperature inside is never below 67f during the day. We lower the thermostat to 55f at night, though the temperature doesn't often drop below 60f.
Humidity levels inside are routinely between 55% and 68% in both the summer and winter. Most mornings in the winter, we wake to (really) dripping windows, especially in the north-facing bedroom which doesn't get any direct sunlight for a few months of the year. The windows are quite old aluminium-framed models.
In order to try and reduce the indoor humidity levels, we're investigating adding a whole-house dehumidifier to the HVAC ducts.
One contractor has suggested an ERV instead, though as the winters are colder and very wet, I'm not sure this would help.
Any suggestions for solving the humidity and condensation problem? Would a whole-house dehumidifier help in this climate? Is an ERV a viable solution?
Thanks in advance,