How is an Air Conditioners size determined?

In accordance with Industry standards, dependent on geographic location, most Air Conditioning units are sized to extreme load conditions. Items considered are worst-case outdoor conditions, maximum internal heat loading, with a margin of safety added on. This result is then applied to the closest next size larger available air conditioning unit that is most often chosen for installation.

Therefore, except when conditions require maximum output, the majority of its hours of operation are spent operating with excess capacity; oversized for the duty it is performing, while wasting energy.

How does the A/C POWERMIZER adjust this overcapacity?

The A/C POWERMIZER turns the compressor off (largest electrical load) when its program senses overcapacity. (Saturated air unable to accept further cooling).
The air handler fan continues the cooling circulation. Upon sensing the calculated point that will maintain uninterrupted cooling the compressor is re introduced, thereby adjusting the output of the Air Conditioner to meet the demands of existing conditions and the set point of the thermostat, therein re-sizing the unit to meet demand. The result is a savings of energy without sacrificing comfort.

Why doesn’t the thermostat do the same job?

The thermostat maintains a temperature at which it is located, within certain tolerances, and cannot regulate the cooling applied to the area serviced by the Air Conditioner.

The oversized Air Conditioning system can quickly satisfy the thermostat set point. By rapidly satisfying the set point the system overshoots the set point.
Thermostat design set point allows for overshoot prior to switching the unit off. In many cases the short run time does not allow for proper dehumidification.

The A/C POWERMIZER modulates the output of the Air Conditioner in accordance with the demands of the area cooled so the overshoot of the thermostat set point is minimal while maintaining a more energy efficient cooling period.

Where does the A/C POWERMIZER work?

The A/C POWERMIZER is compatible with most residential and light commercial units. e.g. packaged direct expansion(DX), split systems, PTAC units utilizing a single thermostat or sensor.

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The thermodynamic efficiency of the cooling cycle is improved by cycling the compressor. Compressors run most efficiently when fully loaded. In a static condition the refrigerant gas is at its highest density. Upon startup the compressor is fully loaded and the first minutes are the most efficient due to the higher evaporator coil temperatures accelerating the heat of vaporization process, resulting in a lower specific volume. This denser gas results in a higher compressor volumetric efficiency and a higher system Coefficient of Performance(COP).

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With the A/C POWERMIZER the supply air temperature is held to a closer tolerance with a resultant lower loss of cooling due to heat transfer to the surroundings. An additional gain is there is less coolness remaining in the coil and ducting that is lost at the end of the cooling cycle.

This is all accomplished with a simple to install, failsafe electronic device with one sensor.

To sum up:

1. Compatible with all split system Air Conditioners with
   single thermostat.
2. Modulates the output of the compressor to the
   immediate heat load of the space being cooled, not
   just at the location of the thermostat.
3. Less overshoot of the thermostat set point.
4. Improved thermodynamic efficiency through proper
   loading of the compressor.
5. Less coolness remaining in the coil and ducting after
   thermostat reaches set point.
6. Non-system intrusive installation. (No down time)

Are there other ways of achieving the same savings?
Parallel Technology
New Equipment Manufacturer introductions in 2001

Mitsubishi Inverter controlled compressor.
Inverter slows speed of compressor therefore it runs longer to gain similar result.

Luxaire by Coleman
Uses reversible rotation compressor to control number of pistons compressing gas. One direction is for highest demand; opposite direction is for lower demand. Compressor runs longer at lower demands. Achieves similar result.

Older Technology
Requires removal of gas from system, soldering in new piece, reinstalling gas. APR Control Senses suction pressure as an indicator of air temp across the coil. Cooler temperatures = less pressure. “The APR Control moves to prevent the system thermostat from reaching its set point and shut the cycle off”.

Comment:
The compressor runs longer.This sensory utilization (pressure) lags behind the actual temperature of the air exiting the coil. We sense the changes quicker by sampling air temperature.The device is subject to malfunction from internal debris destroying the cooling ability of the unit.

Thermostats:
Thermostats that keep the air handler fan running after the Air Conditioner would normally have been shut down because the set point has been reached. This takes advantage of the excess cooling left in the coil and ducts. (See comment below)

Other devices:
Manufacturers install delays in the fan control to keep the air handler fan running after the thermostat has reached set point and turned off the Air Conditioner. This too takes advantage of the excess cooling left in the coil and ducts.

Comment:
Since these devices are time based, when the cooling left in the coil and ducts is exhausted hot humid air will be introduced into the area serviced.