A number of residents have recently installed a whole house furnace humidifier. I used Lamarche Heating and Air having heard a few good (job very well done) recommendations from these residents. Highly recommend this vendor. He also put me on a once a year furnace/air cond spring tune up. His number is 603-421-7357. See also Bob McGrath’s review on this vendor. Price right now on the humidifier is $450. Manufacturer of the unit is Aprilaire.