Today I came to Linda’s Airdrie home to perform the annual furnace maintenance on the 3 year old system. Linda has explained that it is very loud. Upon tune up and inspection I tested and adjusted the gas valve, burners, gas pressure and temperature rise. Pulled and cleaned the flame sensor. Tested ignition system, inducing motor and assembly, blower motor and assembly, heat exchanger, humidifier, static pressures, tested and tightened all electrical connections, all safety switches and control board. Furnace is in good condition. The furnace filtration system was plugged solid which is what was making the sound. These must be cleaned every 3-6 months. The system is very dirty and needs to be cleaned. The humidifier is plugged and has broken venting plus a plastic water supply resting on heating ducts. This is a recipe for a leak. There is no air purifier above the ac coil. Linda and Karen will consider the options and let us know should they want any work done.