from: EPA-402-K-97-002, October 1997

Yes No
General Did the contractor clean the entire heating and cooling system, including ductwork and all components?
Heating Is the heat exchanger surface visibly clean?
Cooling Are both sides of the cooling coil visibly clean?
Components If you point a flashlight into the cooling coil, does light shine through the other side? (It should if the coil is clean.)
  Are the coil fins straight and evenly spaced (as opposed to being bent over and smashed together)?
  Is the coil drain pan completely clean and draining properly?
Access Doors & Covers Are newly installed access doors attached with more than just duct tape (i.e., screws, rivets, mastic, etc.)?
  With the system running, are all access doors or covers tight (no air leaks)?
Plenums Is the return air plenum free of visible dust or debris?
  Do filters fit properly and are they the desired efficiency?
  Is the supply air plenum (directly downstream of the air handling unit) free of moisture stains and contaminants?
Blower Are the fan blades clean and free of oil and debris?
  Is the fan compartment free of visible dust or debris?
Metal Ducts Are interior ductwork surfaces free of visible debris? (Select several sites at random in both the return and supply sides of the system.)
Fiberglass Duct Surfaces Is the fiberglass material in good condition (i.e., free of tears and abrasions; well adhered to underlying materials)?
Air Vents Have your air vents been firmly re-attached to the walls, floors, and/or ceilings?
  Are the air vents visibly clean?
System Operation Does the system function properly after cleaning?
  Is the system operating free of any new noises?