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What's the best combined heating and AC unit to get for a 1200 sq ft, single story, 1920s Spanish house in LA?

by LiveModern Webmaster last modified Jan 04, 2012 02:06 AM
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by last modified Nov 22, 2010



Every house is so different, your best solution will need to be tailored to meet your home and your budget. The best way to do this properly and avoid expensive mistakes is to have an energy auditor assess your home, including a blower door test and manual J load calculation. This will define your home's current conditions, and may uncover hidden opportunities to increase comfort and reduce energy bills.

A lot of the tenets of building science are completely counterintuitive. Often people's erroneous preconceptions take them down the path of bad design. For example:

  • Smaller equipment is better. By installing the smallest equipment possible, you will get much more even temperatures throughout your home. Also, equipment and airflow noise is dramatically reduced with smaller equipment.
  • Longer run times are better than short. Equipment takes a while to reach optimum efficiency, so short cycles may mean the equipment NEVER reaches optimum efficiency.

For most people, these two concepts cause eyes to widen. I could go on for days listing misguided assumptions and preconceptions that I have had turned on their heads.

This was originally an equipment question.

  • Based upon the size of your home and its location, I suspect some type of small hybrid system or mini-split heat pump will be options you should explore.
  • If you get a traditional system, I would strongly encourage multi-stage equipment, as I suspect you will find they don't make single-stage small enough to properly match the load of your home, even in the very coldest weather you experience.




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