Picking The Right Heating and Cooling System For Your Home
Buyers Beware: Correctly Sized Air Conditioners Save Money!
When you purchase a new A/C unit to replace your old one - or if an entirely brand-new system is being installed in your brand-new house - the installer needs to understand how big or, more importantly, how little the unit ought to be. In order to know precisely how big (or small) it ought to be, the contractor has to calculate what does it cost? cooling and heating capacity it need to have to keep the occupants comfy. This is called the load of the house.
The load of the home is partially dependent upon the house's square footage. Nevertheless, a true load estimation goes beyond that. A precise load determination consists of building construction; orientation to the sun; 'R' worth of the insulation; number, size, and placement of spaces; number, size, and positioning of windows and doors; kinds of windows and doors (thermal performance); number and arrangement of floors; and the environment.
Residential load computations use mathematical formulas that take all these variables into factor to consider. They have actually been computerized, so they're not as lengthy as they remained in the past.
Determining the load by utilizing rules of thumb often causes an over-sized cooling and heating system, leading to an increased initial cost, increased regular monthly energy costs, increased maintenance, and shortened equipment life due to the fact that the devices cycles off and on too often.
Who Does the Load Calculation?
The specialist you opt to install your brand-new system should be able to perform these computations. You might ask him for this service. If he does not wish to do it, or states it isn't really essential, you might wish to try to find a various specialist. In some locations, the regional energy will carry out a load estimation - contact your regional energy.
Why it's Important to Have the Right Sized System
Having the wrong-size heating-cooling system can cause several issues. Over-sizing your cooling system is not an advantage. Without entering excessive detail, your cooling load includes 2 parts:
- The temperature of the air, called the practical load.
- Moisture or 'humidity' in the air, called the latent load.
We've here all heard the saying, 'It's not the heat; it's the humidity.' A cooling system that is too big cools down the temperature very rapidly, however it does not run long enough to remove enough wetness or 'humidity' from the air. The result is you feel cool but clammy. Many people then decline the thermostat to make the air conditioning system run longer, increasing the energy expense. In some cases, the inadequate moisture elimination arising from over-sized cooling equipment can cause mold growth and other types of moisture-related damage.
A correctly sized cooling system runs enough time to 'wring' wetness from the air. This allows you to be comfy at a slightly greater thermostat setting and allows you to conserve money on your energy bill. It also looks after the 'mugginess' without making you feel too cold.
A/C systems are sized in 'heaps,' which is a step of the rate at which they deliver cooling, not how much they weigh. One lots of cooling amounts to 12,000 BTU/H (British Thermal Units per hour), the rate of cooling required to freeze one ton of ice at 32F in one day.
It is much better to have a system that provides a little less than the required tonnage of cooling, rather than a system that provides more than the needed tonnage of cooling.