Performed Platinum Comfort Club Membership Tune-Up on Heating System - performed cleanings and operational checks of equipment. Changed Aprilaire 213 filter. Checked status of surge protector and it is working properly. Recommended humidifier for home to improve comfort during winter months as well as air purifier to keep air within the home clean. Quoted prices for each. Customer interested in humidifier and will call in to have it installed if wanting to do so.