Came out to call to perform preventative maintenance on furnace. Met customer at garage and we began to discuss the maintenance being done today, filters, and how things were going. Customer stated that the filters do need to be changed, and that everything is working fine so far. I changed out the filters in the home. Inspected the blower assembly, motor, capacitor, electrical components, heating components, evaporator coil, heat exchanger and overall condition of equipment. Cleaned flame sensor and dust off the burners and components. Checked system operation, amps, temperatures, gas pressure, and CO levels. System is heating properly at this time. Discussed with customer about in home allergens and the products we offer. Customer wasn’t interested at this time.