Nu-Calgon Evaporator Coil Cleaner - Evap Foam No-Rinse Aerosol, 18 oz 2‑Pack, Thick Clinging Foam for HVAC Coils

Nu-Calgon 4171-75 Evap Foam No Rinse is a ready-to-use aerosol that lifts and removes dirt and grime from evaporator coils without requiring a separate rinse.

This two-can set of Nu-Calgon evaporator coil cleaner supplies a thick, clinging foam designed for indoor HVAC components. Formulated to penetrate grease, dust, and light organic buildup, the aerosol expands to reach coil fins and pan areas where ordinary sprays may miss. Because it’s labeled as a “no rinse” formula, technicians can apply it in occupied spaces and confined areas where rinsing with water would be difficult or undesirable.

How does this foam make coil cleaning easier for technicians?

The aerosol dispenses a dense foam that adheres to vertical and horizontal surfaces, holding cleaning agents in place long enough to break down soils. This reduces the need for repeated applications and minimizes dripping. It’s packaged in convenient 18 oz cans for portability between service calls.

• Thick, clingable foam for improved contact time
• Aerosol delivery for precise spot treatment
• 18 oz cans sized for handheld use and storage

Will it harm coil fins, insulation, or surrounding components?

Nu-Calgon formulas are developed for use on HVAC evaporator coils when used according to directions. The product is intended to clean coils without manual rinsing, which helps avoid water exposure to sensitive insulation and electrical parts. Always follow manufacturer instructions and test on a small area if you’re unsure about compatibility with specific materials.

• Designed for evaporator coil surfaces when used per instructions
• No-rinse use lessens water contact with nearby components
• Recommended to spot-test unfamiliar materials first

How should I apply and how long until the coils are ready for service?

Shake the can, apply evenly across coil surfaces from a safe distance, and allow the foam to dwell to loosen soils. Let foam soak and collapse—this typically takes a few minutes—then remove excess residue per label guidance. After treatment, the system can usually be returned to service once foaming subsides and any loosened debris is cleared.

• Shake well and spray evenly across coil surfaces
• Allow a few minutes for foam action and soil breakdown
• Clear loosened debris and follow label for final steps

Can I use this product in occupied spaces and residential homes?

Nu-Calgon’s no-rinse foam is commonly used by HVAC professionals in both commercial and residential settings, particularly where rinsing is impractical. Because it’s an aerosol cleaner, good ventilation and adherence to safety instructions are important during application. Keep occupants informed and follow recommended precautions on the product label.

• Suitable for residential and light-commercial evaporator coil cleaning
• Use with ventilation and personal protective equipment as directed
• Inform occupants and avoid direct contact with skin and eyes

Who is this for: Nu-Calgon 4171-75 Evap Foam No Rinse 18 oz (pack of 2) is aimed at HVAC technicians, maintenance teams, and DIY-savvy homeowners who need a portable, no-rinse solution for cleaning evaporator coils. It’s useful when access to water is limited or when minimizing moisture near electrical components is a priority. Purchase this two-pack if you want on-hand aerosols for repeated service calls or seasonal coil maintenance, and always read and follow the product label for safe, effective use.