I have a 2-year old Lennox sealed inside coil, and when I went to clean it it is sealed (unlike my last home's coil which was easy to reach for cleaning).
My question is, can I foam spray it from the outlet side? Would that be almost effective as cleaning from the inlet side, especially if it's not to dirty and will be done each year?
Warmth in household air drawn over the cold surfaces of the evaporator coil is absorbed by refrigerant vapor circulating through the coil. Anything that comes between the transfer of heat energy in the air into the refrigerant inside the coil decreases efficiency of the cooling process. What could get in the way? Even a thin coating of dust on coil surfaces produces a measurable drop in heat absorbed by the refrigerant. Installed inside the air handler, directly in the path of circulating air, the evaporator is perfectly positioned to accumulate dust, dirt and a variety of other airborne particulates picked up throughout the house.
Sealed inside the air handler installed in the
HVAC closet or up in the attic, the evaporator coil is not readily accessible to the average homeowner and its condition is rarely checked. When symptoms suggest dirty evaporator coils and an inspection by a professional confirms it, the cleaning process conducted by an
HVAC technician is painstaking but thorough.
