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Computerized Sales and Inventory System

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SYSTEM SELECTION
Proper heating and cooling system selection takes into consideration fuel sources (e.g., natural gas and electricity), distribution mechanisms (e.g., air and hydronic), equipment options (e.g., furnace and heat pump), and equipment efficiency.
Perform a life-cycle analysis of various properly sized HVAC options to select a cost-effective system. Cost considerations include equipment and installation prices, annual heating and cooling expenses, and maintenance costs.
Although more difficult to evaluate, equipment reliability, longevity, warranty coverage, and safety are also important.
For example, the heating fuel source directly impacts operating costs. Also, high-efficiency heating equipment often costs more than standard-efficiency models, but it costs less to run. So the life-cycle cost—rather than initial purchase price—may make high-efficiency equipment or one fuel rather than another the economical choice.
Some HVAC contractors and local utilities provide life-cycle analysis of various equipment options. A summary of many easy-to-use software products for estimating annual heating and cooling costs is compiled by
DOE’s BTS (www.eren.doe.gov/buildings)

WHY SIZING IS IMPORTANT
A common mistake in the heating, ventilation, and air conditioning (HVAC) industry is to oversize heating and cooling equipment, especially air conditioners and heat pumps.
Bigger does not always mean better. Overcapacity equipment has a higher initial cost, costs more to operate, and may be less effective than optimally-sized equipment.
Because conditioning equipment reaches its highest operating efficiency only after about 5 to 15 minutes of continuous run-time, oversized units, which often run for shorter periods of time, are less efficient than properly sized units.
This short cycling can result in cold, clammy indoor conditions during cooling seasons, large conditioned-space temperature swings, mechanical breakdown (due to frequent start/ stop cycles), poor furnace heat exchanger life
(due to flue gas water vapor condensation), and high operating costs. Oversized equipment may also be noisy because of large fans or undersized ductwork and may use more electricity to operate the blower fan.

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