Replacing Your A/C: The ABC’s Of Manual J

Replacing Your A/C: The ABC's Of Manual JIf you are considering replacing your air conditioner, one of the most important things you will need to do is make an accurate calculation of your cooling load. In the HVAC industry, “cooling load” is a term that refers to the energy requirements necessary to cool your home to the desired level on an average summer day. The concept itself is deceptively simple; while it may seem like a fairly straightforward thing to figure out, the truth is that accurate cooling load calculations are complex and intricate. Industry professionals rely on a protocol spelled out in a reference work known as Manual J.

Manual J contains the specifics of a cooling load calculation process which was developed by engineers over a period of many years. Many homeowners mistakenly believe that they can generate an accurate estimate of their cooling load by considering no more than the size of their home, but this can lead to major under- or over-estimations. Given that the average homeowner spends hundreds of dollars per month on home cooling during the summer, it makes good sense to invest the time and effort into performing an accurate cooling load calculation using Manual J standards.

Beyond cost savings, the benefits of accurate cooling load assessment are threefold:

  1. Operates with superior efficiency
  2. Optimally comfortable indoor environment
  3. Superior indoor air quality

A complete Manual J load calculation will specify two types of cooling load: the so-called “sensible cooling load,” which is the cooling load under normal summer conditions, and the “latent cooling load,” which is the cooling load under extreme heat conditions. It will also specify your heating load, which is a useful metric for the winter months.

At Rite-Way Ventilating Co., we help homeowners throughout the Tucson area size their home heating and cooling systems accurately and correctly. Contact us today to schedule an appointment for a professional to perform a Manual J cooling load calculation of our home.

Our goal is to help educate our customers about energy and home comfort issues (specific to HVAC systems).  For more information about Manual J and other HVAC topics, download our free Home Comfort Resource guide.

Rite-Way Ventilating Co services Tucson, Marana, Catalina, Oro Valley, Vail, Sahuarita, Green Valley and Tubac, AZ. Visit our website to see our special offers and get started today!     

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    John Molloy John Molloy has been employed at Riteway since Dec 2010 and was an estimator... More »