The bare minimum basic repairs to get the system running today. Customer has 12 y/o Goodman furnace that operates for whole house. Furnace located in crawlspace. System was not heating due to bad ignitor. Replaced ignitor. Tested heating. Noticed that flue venting is incorrect, single wall and tape is used to secure. Informed customer of the danger of current flue venting. No water protection present. Blower wheel cleaning needed. Ductwork is inconsistent. Overall efficiency of system is declining. Informed customer of all findings. System is currently working.