Air Conditioner Sizing for Residential Homes

Air Conditioner Sizing for Residential Homes Most all Americans know that if you want to stay cool, get an air conditioner. Many know changing the filter regularly is critical to long term performance. Some can even tell you how a unit uses the refrigeration cycle to control temperature. When it comes to proper air conditioner sizing, only a handful have any idea what they need for their home. Hopefully, we can fix that.

For Air Conditioner Sizing, Bigger is Better...Right?

No.

Are you sure?

Yes, bigger is not better! In most cases an over-sized system is going to waste energy, cost you more money, and provide inferior air comfort. That's right, a system too big for your home will actually make it feel worse inside than a properly sized system. Too large an air conditioner can even be dangerous. Over-sized systems usually do not dehumidify properly. That could allow mold to grow where you don't want it (not that you want it anywhere). To make sure you get the right sized HVAC system, you need to have a properly conducted Manual J Load Calculation completed.

What is a Manual J Load Calculation?

Ah, glad you asked. A Manual J measures your home and determines what size system you need. It checks stuff like the following:
  1. Major home appliance and interior lighting efficiency
  2. Projected number and age of occupants
  3. Location and type of windows and doors
  4. Anticipated air infiltration rate
  5. Size, shape and orientation of home
  6. Local climate conditions (i.e. seasonal highs & lows)
A good energy efficiency specialist will conduct a Manual J Load Calculation and use that data to determine how big, or small, your air handling unit needs to be. Make sure he's doing it properly and not just 'guesstimating', since that's a good way to get an improperly sized unit. Which is the last thing you need as part of your home HVAC system.

I Can't Find a Energy Efficiency Specialist!

Many utility companies have personnel on staff who can visit your home to conduct energy audits and the like. If you can't find someone, contact us. We will work with you to figure out the right size air conditioner perfect for your needs.
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