When you’re buying new HVAC equipment, knowing more about the three types of heating and cooling loads used in sizing calculations can help ensure you purchase the correct capacity. The term “load” always refers to the amount of heating or cooling your Frederick, MD home requires, while “capacity” refers to specific equipment output. These are the three load types that factor into HVAC sizing calculations.

Design Load

When an HVAC professional uses Manual J to size new equipment, he inputs the design conditions, which are the local indoor and outdoor average temperatures during the summer and winter. The software uses this data and a number factors like insulation R-values and solar orientation to determine the home’s design load. Ideal design load conditions don’t exist all the time, but they provide a good guideline for sizing.

Extreme Load

Our humid subtropical climate creates some significant temperature changes throughout the year. Summer temperatures have hit 108 degrees, while the coldest winter temperature on record is -7 degrees. These variations are the extreme loads your HVAC equipment may have to handle, but they’ll occur only about 1 percent of the time.

Instead of sizing equipment using extreme loads, Manual J software pads the design conditions by 15 to 20 percent to allow for these rare occurrences. Air sealing and installing sufficient insulation are also necessary to ensure home comfort.

Part Load

The remaining 99 percent of the time, your HVAC system runs at part load, where its full capacity isn’t used. This occurs whenever the actual outdoor temperature doesn’t reach design condition temperatures. Since most HVAC equipment has a set output, this can cause excess humidity and temperature fluctuations in a home. If these are concerns, installing a whole-house dehumidifier or choosing HVAC equipment with a variable-speed compressor and air handler may be necessary to maintain comfort.

Learn more about heating and cooling loads and Griffith Energy Services, Inc.’s air conditioning installation solutions, or call us today at 888-474-3391.

Image via Flickr by nist6ss

Dear Customers,

At this time, when the news is dominated by the Coronavirus (COVID-19) health emergency around the world, we wanted to personally reach out and let you know that we are vigilantly implementing enhanced protocols to ensure your safety and the safety of our team.

We are closely monitoring the guidance of the World Health Organization and the Centers for Disease Control regarding the spread of the virus. This is an evolving situation and we will continue to develop and take necessary measures as needed. Our focus is to ensure that we meet customer needs while doing our part to keep you, our employees, and our communities safe.

Here’s what we’re doing:

  • Everyone on our team has received enhanced training and protocol briefings. We will continue to evolve and adjust these protocols as needed.
  • We are implementing telecommuting options for positions where applicable.
  • Non-essential work travel is currently on hold for all employees.
  • We are conducting enhanced cleaning practices at our locations and are instructing employees to continually sanitize their work stations and vehicles.
  • We are also urging all employees to be vigilant about frequent hand washing.

Information for you:
If you have an existing service appointment, we look forward to seeing you and want to reassure you that we are doing everything we can to promote a safe and secure service experience.

During this challenging time, if you are experiencing symptoms related to the COVID-19 virus or have been exposed to it, in order to protect our team and all the customers we serve, we encourage you to please reschedule your service appointment, by calling us at 888-474-3391.

Your safety is our highest priority and we truly appreciate the trust that you place in our team and our company.

Best regards,
Griffith Energy Services
888-474-3391

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