Selecting The Right A/C System For Your Home

Buyers Beware: Correctly Sized Air Conditioners Save Money!


When you buy a new air conditioning system to replace your old one - or if a totally brand-new system is being installed in your new house - the installer has to understand how big or, more significantly, how little the unit must be. In order to understand exactly how big (or little) it needs to be, the specialist needs to determine what does it cost? cooling and heating capability it should have to keep the occupants comfortable. This is called the load of the home.

The load of the home is partly dependent upon the home's square video. Nevertheless, a real load calculation surpasses that. A precise load decision consists of building construction; orientation to the sun; 'R' value of the insulation; number, size, and placement of spaces; number, size, and placement of windows and doors; types of doors and windows (thermal performance); number and plan of floors; and the environment.

Residential load computations make use of mathematical solutions that take all these variables into consideration. They have been digital, so they're not as time-consuming as they remained in the past.

Determining the load using rules of thumb almost always leads to an over-sized heating and cooling system, leading to an increased initial expense, increased regular monthly energy bills, increased upkeep, and reduced equipment life since the equipment cycles off and on too regularly.

Who Does the Load Calculation?
The contractor you choose to install your new system needs to be able to perform these calculations. You might ask him for this service. If he doesn't want to do it, or says it isn't needed, you might wish to look for a different contractor. In some areas, the local utility will perform a load computation - contact your regional utility.

Why it's Important to Have the Right Sized System
Having the wrong-size heating-cooling system can result in several issues. Over-sizing your cooling system is not a good idea. Without entering excessive detail, your cooling load consists of 2 parts:

  • The temperature level of the air, called the reasonable load.

  • Moisture or 'humidity' in the air, called the latent load.

We've all heard the saying, 'It's not the heat; it's the humidity.' A cooling system that is too big cools off the temperature level extremely quickly, however it does not run long enough to remove adequate moisture or 'humidity' from the air. The outcome is you feel cool but clammy. Many individuals then decline find out more the thermostat to make the air conditioner run longer, increasing the energy bill. In many cases, the insufficient wetness elimination resulting from over-sized cooling devices can cause mold growth and other kinds of moisture-related damage.

A correctly sized cooling system runs long enough to 'wring' wetness from the air. This allows you to be comfortable at a slightly greater thermostat setting and permits you to save cash on your energy costs. It likewise takes care of the 'mugginess' without making you feel too cold.

A/C systems are sized in 'loads,' which is a step of the rate at which they provide cooling, not what does it cost? they weigh. One lots of cooling amounts to 12,000 BTU/H (British Thermal Units per hour), the rate of cooling needed to freeze one lots go here of ice at 32F in one day.

It is much better to have a system that provides a little less than the needed tonnage of cooling, instead of a system that provides more than the needed tonnage of cooling.

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