Dirty Coils Cost More!

The impact of dirty coils can be one of the most costly things related to you cooling system. Not only does it increase your energy cost and reduce your cooling capacity, it allows for dirt and bacteria to filtrate throughout your facility.

How Much Can You Save?

Below is an example of how much extra you might be spending if you have dirty or impacted coils. This chart was produced by the Airguard Research and Technical Center. The study compares the operation of a clean coil versus a ‘moderately dirty’ coil. The comparison between clean and dirty operation shows the benefit of having clean coils.
A season has been defined in this study as 1,000 hours of operation. The energy cost for the dirty coil is based on the number of hours to give the equivalent cooling capacity of the clean coil.


1. Unit operating at 80 °F ambient temperature, 45 °F saturated suction temperature (standard design), F22 refrigerant, 1000 hours of operation (minimal seasonal operation).
2. Based on current Consolidated Edison Service Class 9 rates: $0.0276/Kwh + $0.0199/Kwh fuel adjustment charge + $6.36 per KW demand per month + 14.1% tax.
3. Unit operating at 140 °F – 144 °F saturated condensing temperatures at 45 °F saturated suction temperature (337-354 psi head pressure) to simulate dirty condenser operation multiplied by required hours to give the equivalent cooling to Table 1 figures.