Resources

Benefits of Maintenance

   Condition

   Cause

   Effect

   Dirty Air Filters
  • Improper Change Frequency
  • Improper Media Application
  • Too Much Outside Air
  • Compressor Failure
  • Restricted Evaporator Coil
  • Plugged Motor Passages
  • Dirty Blower Wheels
  • Bearing Failure
  • Increased Energy Consumption
  • Evaporator Motor Failure
  • Loss of Air Flow
   Faulty Drive Belts
  • Improper Belt Alignment
  • Wrong Size and Type
  • Sheave Alignment and Wear
  • Bearing Wear
  • Compressor Failure
  • Pulley Replacement
  • Loss of Air Flow
  • Bearing Failure
  • Evaporator Motor Failure
  • Noise
   Dirty Motors
  • Overheating of Windings
  • Compressor Failure
  • Increased Electrical Consumption
  • Noise
   Burnt Contact Points
  • “Single Phased” Components
  • High Point Resistance
  • Compressor Failure
  • Premature Component Failure
  • Increased Electrical Consumption
   Refrigerant Leaks
  • Cracked Solder Joints
  • Improper System Charge
  • Safety Control Cycling
  • Loss of Lubrication
  • Compressor Failure
  • Increased Energy Consumption
  • Decrease in System Capacity
  • System Freeze-up
   Plugged Drains
  • Debris Build-up
  • Flood-over onto Ceiling
  • Leaks onto Roof
   Debris on Roof
  • Left Behind by Contractors and Others
  • Injuries
  • Roof Leaks
  • Roof Repairs
  • Unsafe Conditions
   Missing/Loose Panels
  • Improper Installation After Servicing
  • Wind Damage
  • Conditioned Air Lost
  • Water Filtration and Damage
  • Increased Energy Consumption
  • Equipment Damage
  • Rust and Corrosion

 

Frequently Asked Questions

Q: How are residential and commercial systems rated?

A: SEER (Seasonal Energy Efficiency Rating) is typically how a residential central air conditioner is typically measured and rated, while EER (Energy Efficiency Rating) is for measuring and rating commercial air conditioning efficiency. When considering models sold under a particular brand name, be sure to check their average “fleet efficiency” rating. Even though checking the fleet efficiency is one way to measure a model’s rating, it is not always a clear indicator of durability or quality. Side by side comparisons of the SEER ratings of two different models will be a better indicator of performance.

Below are a few ways to calculate the efficiency of your unit.

The efficiency of air conditioners is often rated by the Seasonal Energy Efficiency Ratio (SEER) which is defined by the Air Conditioning, Heating and Refrigeration Institute in its standard ARI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment.[1]

The SEER rating of a unit is the cooling output in Btu (British thermal unit) during a typical cooling-season divided by the total electric energy input in watt-hours during the same period. The higher the unit’s SEER rating the more energy efficient it is.

For example, consider a 5,000-British-thermal-unit-per-hour (1,500 W) air-conditioning unit, with a SEER of 10 BTU/W·h, operating for a total of 1000 hours during an annual cooling season (e.g., 8 hours per day for 125 days).

The annual total cooling output would be:

5000 BTU/h × 8 h/day × 125 days/year = 5,000,000 BTU/year

With a SEER of 10, the annual electrical energy usage would be about:

5,000,000 BTU/year / 10 BTU/W·h = 500,000 W·h/year

The average power usage may also be calculated more simply by:

Average power = (BTU/h) / (SEER) = 5000 / 10 = 500 W

If your electricity cost is 20¢/kW·h, then your cost per operating hour is:

0.5 kW * 20¢/kW·h = 10¢/h

 

To find out more about SEER and EER, visit the Energy Star website or go to Wikipedia.