Maintenance on 17 yr old Trane system. Blower wheel has a build up of dirt and dust on it, quoted cleaning cost. Draft motor sounds rough on start up and customer has had issues of furnace not starting unless they unhook a section of vent pipe to the furnace. Informed to customer that section of pipe should be glued to prevent any fumes from furnace leaking into the home. Customer requested that I not glue that pipe. Customer had mesh wire on end of vent pipe to prevent birds and bees from getting into it. Informed customer that can cause issues with furnace start up closing pressure switches. Took wire mesh off pipe. Customer purchased a soft start product for their ac unit that we do not work with. Customer elected to install unit themselves rather than paying the labor cost for us to install it. Ac uses r22 refrigerant. Suction pressure seemed low but it’s 40 degrees outside. Informed customer to keep an eye on the cooling and to call us back it doesn’t seem to be cooling well.