Load Calculation is Step 1 for an A/C Install
Bigger is not always better, especially when it comes time for you to install new central air conditioning. Choose a system that is just the right size for your home and its particular characteristics by using a Manual J load calculation, which follows the guidelines of the ACCA (Air Conditioning
Posted — UpdatedEvery home is different. For this reason, A/C load calculation does not take into consideration only your property's total square footage. Other important factors include:
- Your local climate and geographic latitude
- The house's layout and age
- Its orientation (that is, which direction it faces)
- The number and location of windows, as well as their u-values and coverings
- Your roof's material and condition
- Any shade provided by overhangs or nearby trees
- Appliances and light fixtures inside the home and how their degree of energy efficiency
- The number of human and animal occupants (who all raise the ambient temperature with the body heat that they give off).
If you already have HVAC ductwork in place, its layout and efficiency will be noted. Any "green" updates you have made to help with energy conservation, such as insulation and sealing, will also be part of the calculation. Finally, you will need to decide on your desired indoor summer temperature.
There are many advantages to performing an accurate load calculation. First, it costs less to purchase and install or replace air conditioning that is correctly sized for your needs. Second, you will spend less on running the system. In addition, an overly large system may tend to short cycle (turn on, cool your home quickly, then turn off). This results in uneven cooling and reduced comfort levels and tends to wear out the A/C more rapidly. Short cycling may also prevent your HVAC's dehumidification feature from kicking in, leaving your home with uncomfortably high relative humidity in the warmer months.
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