Properly Sized Air Conditioner Equipment - A Must in Hot Houston,Texas Summers

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Residential Cooling systems need to be properly sized so the home will be comfortable during the hottest weather. If the unit is oversized, energy costs may increase and the home may experience high temperature swings during mild weather. Over sizing also increases cost paid for equipment, money better spent on purchasing more efficient equipment.

Determining the proper size for Cooling system requires estimating heat loss through the roof, walls windows, basement, and other home components under severe outside conditions. This is the design heat load for the home. For many Air Conditioning appliances, size of the unit selected is from 10 to 30 percent above the design heat load. This over sizing allows the unit to recover quickly from night setback.

The contractor bidding the new Air Conditioning system should determine the correct sizing using techniques that evaluate the insulating value of the area of each home component. Using rule-of-thumb for sizing Cooling equipment often results in a unit that is grossly over or undersized. If this unit is a replacement, using the same size as the existing unit should be strongly discouraged. The old unit may have not been sized properly and energy-conserving improvements may have been made to the home since its installation, reducing the need for Cooling.

Selecting the most cost-effective Cooling system
Selection of the most cost effective AC system will depend on price and availability of differing fuels as well as the cost of initial installation. Higher initial investments are often justified by reduced utility costs over the lifetime of the unit.

Methods for estimating annual operating costs of central units are usually provided by manufacturers. To determine the most cost-effective system, it will be necessary to obtain bids from several contractors. The additional cost for the more efficient system must be compared to the energy savings. If this is a new home, the cost if the Cooling system will be part of the mortgage cost. If the annual total cost Cooling energy plus the mortgage payment for one system is less than for another, then the system is cost effective. If you are considering replacing and existing Cooling appliance, you must decide of the savings from a more efficient system are enough to justify the additional cost. It is important to remember that Cooling systems are only replaced about every 20 years, so you will have to live with your decision for some time.
Central Warm-Air Cooling Systems

Air Conditioning system components include Condensers, Evaporator Coils, conventional heat pumps, and the right sized blower which is housed in a furnace or air handler. Ducts provide a passage for heated and cooled air to and from the conditioned space. While this article focuses on selecting a type of Air Conditioner cooling components, understanding the importance of proper duct design and installation on the efficiency of the installed Cooling system is fundamental to having an efficient system.

Ducts must be well sealed. Studies throughout the country indicate duct leakage significantly reduces the delivered efficiency of Cooling and cooling systems. Sealing with duct tape is not satisfactory because most duct tapes fail within a month or two. The duct installer must use mastic-type sealant or at a minimum, foil-backed tape at all joints.

Return ducts must also be sealed. Return air ducts are often constructed by encasing a standard building cavity with metal or gypsum board. The space between floor joists is often panned off with sheet metal, or sections of interior partitions are covered with gypsum board. Building cavity returns air ducts must be sealed, just like supply ducts.

It is not uncommon to find up to one-inch gaps between sheet metal and floor joists. A powerful furnace fan creates strong negative pressure in the return ducts, drawing air from unheated sections of the home. Because the defects are covered with wallboard, they must be corrected during construction. New techniques in duct sealing allow mastic to be injected into the ducts where it seeks out and seals most holes. However, it is easier to seal ducts correctly during construction rather than attempt to seal after the home is finished.

In addition to sealing, supply and return ducts running outside the heated space should be insulated to at least R-6. If they are located outside, then they should be insulated to at least R-8.

Article Source: http://depositarticles.com/

David K. is the Manager of Texas Central Air, a leading air conditioning repair, installation and service company in the Houston, Texas area.

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