I have a 7 y/o single story home with a hip roof in Western New York. I would like to have a powered roof mounted fan with thermostat and humidistat to regulate temp and humidity in the crawl space. I have a ridge vent (short in length because of the hip) and soffit vents. Roof trusses are 24" oc and the soffit vents are every other space with foam baffles. Local home repair show on radio Saturday mornings says that an HVAC contractor is the trade to install the unit. Is this correct? Also, if the fan is mounted high on the roof will it draw from the ridge vent and not the soffits and if this is a problem should it be mounted midway up the roof or do I have to remove the ridge vent?
Thanks for any advise
kb