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Today's best air conditioners use 30% to 50% less energy to produce the same amount of cooling as air conditioners made in the mid 1970's. Even if your air conditioner is only 10 years old, you may save 20% to 40% of your cooling energy costs by replacing it with a newer, more efficient model.

Air conditioning includes both the cooling and heating of air. It also cleans the air and controls the moisture level.

An air conditioner is able to cool a building because it removes heat from the indoor air and transfers it outdoors. A chemical refrigerant in the system absorbs the unwanted heat and pumps it through a system of piping to the outside coil. The fan, located in the outside unit, blows outside air over the hot coil, transferring heat from the refrigerant to the outdoor air.

     Air Conditioning units are designed to cool your home by absorbing heat in an evaporator coil mounted on your furnace or air handler. This coil is connected by refrigeration lines to your outdoor air conditioner. The more heat the air conditioner can discharge from the house for the smallest amount of electrical usage isknown as the Seasonal Energy Efficiency Ratio or S.E.E.R. The higher this number,the lower the operating cost. (MILES PER GALLON ON YOUR ELECTRIC METER)   S.e.e.r.'s start at 13 and go up to 18+. The degree of air coming out your grilles will be the same no matter if the s.e.e.r. is 13 or 18+. The higher s.e.e.r. equipment just does it cheaper.    

To determine which s.e.e.r. is best for you, you will need to first have to look at your current electric usage ( how cold you like your house ), how much longer you plan on living in your home, and of course your budget. And as you can probably already imagine, the higher the s.e.e.r. the more of an investment you'll have to make. If you plan on living in the home for quite awhile, the higher s.e.e.r. equipment is the way to go. You will recoup your money in the long run.    

The majority of systems installed prior to 1992 were 10 s.e.e.r. or lower. Potential energy savings may vary depending on your personal lifestyle, system settings, equipment maintenance, local climate, actual construction and installation of equipment and duct system. If your current system is 10 s.e.e.r. or lower you can compare it to higher s.e.e.r. equipment and receive a lower electric bill.

Annual Savings
13 S.E.E.R.
up to 38%
14 S.E.E.R.
up to 43%
15 S.E.E.R.
up to 47%
16 S.E.E.R.
up to 50%
18 S.E.E.R.
up to 56%

Basic Operations

Most air conditioning systems have five mechanical components:

  • a compressor
  • an expansion valve or metering device
  • an evaporator coil
  • a blower
  • a chemical refrigerant

Most central air conditioning units operate by means of a split system. That is, they consist of a "hot" side, or the condensing unit—including the condensing coil, the compressor and the fan—which is situated outside your home, and a "cold" side that is located inside your home. The cold side consists of an expansion valve and a cold coil, and it is usually part of your furnace or some type of air handler. The furnace blows air through an evaporator coil, which cools the air. Then this cool air is routed throughout your home by means of a series of air ducts. A window unit operates on the same principal, the only difference being that both the hot side and the cold side are located within the same housing unit.

The compressor (which is controlled by the thermostat) is the "heart" of the system. The compressor acts as the pump, causing the refrigerant to flow through the system. Its job is to draw in a low-pressure, low-temperature, refrigerant in a gaseous state and by compressing this gas, raise the pressure and temperature of the refrigerant. This high-pressure, high-temperature gas then flows to the condenser coil.

The condenser coil is a series of piping with a fan that draws outside air across the coil. As the refrigerant passes through the condenser coil and the cooler outside air passes across the coil, the air absorbs heat from the refrigerant which causes the refrigerant to condense from a gas to a liquid state. The high-pressure, high-temperature liquid then reaches the expansion valve.

The expansion valve is the "brain" of the system. By sensing the temperature of the evaporator, or cooling coil, it allows liquid to pass through a very small orifice, which causes the refrigerant to expand to a low-pressure, low-temperature gas. This "cold" refrigerant flows to the evaporator.

The evaporator coil is a series of piping connected to a furnace or air handler that blows indoor air across it, causing the coil to absorb heat from the air. The cooled air is then delivered to the house through ducting. The refrigerant then flows back to the compressor where the cycle starts over again.


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