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Have you ever walked into your Southern California home during a summer afternoon, and realized that your home was actually hotter and stuffier than the outdoor air? With the scorching days and cool dry nights that we see here in San Bernardino, Los Angeles, and Riverside counties, it is common for homes to heat up to a higher temperature than the air outside. 

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Sure, you could cool your home down using the large amounts of energy it takes to run an air conditioner — but what if there was a more efficient (and healthier) way to keep your home at a comfortable temperature? This is why the comfort and efficiency experts at Greencat install whole house fans.

Combining Better Home Performance and Ventilation

By properly sealing your home off from unintentional air leaks, and installing the right insulation materials for the design of your home, you can increase the stability of your overall indoor temperatures. And when you combine this better home performance with a controlled ventilation system like a whole house fan, you can see a long list of benefits in your home, like:

  • Greater indoor comfort, especially in the summer

  • Lower cooling costs

  • Fewer indoor pollutants & greater indoor air quality

  • Increased home value

  • Lower indoor moisture levels & accumulation

What size whole house fan do I need?

Size is very important to a whole house fan system. If a whole house fan system is not sized properly, meaning enough airflow, the system will not work effectively.


Airflow is measured in CFM, or Cubic Feet Per Minute. Here is the formula for proper sizing:

  • For a "good" system, 2 CFM per square foot of living space.
  • For a "better" system, 2.5 CFM per square foot of living space.
  • For the "best" system, 3 or more CFM per square foot of living space.

This math formula will work every time, for any size home, and as always the more airflow the better. However, there are two other considerations that need to be taken into account when sizing a system. The first consideration is location. If the home is located in a coastal region where the climate is much cooler than a desert, for example, a "good" system will work great. But in a desert climate, the best system would deliver the best results.


The second consideration is ceiling height. If the ceilings in the home are taller than 8 feet, be sure to size the system a little bit larger to account for the increased air volume inside of the home. Remember, the sizing formulas are backed by the Department of Energy, PG&E, and the California Energy Commission.


If sized properly, the whole house fan system will result in a totally satisfied customer every time!

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What Our Customers Are Saying About Greencat

  • Very hardworkers, professional and nice, did the work without any problem. Great customer service, neat. I would use their service again and would refer them to friends and family.

    - Temeka L.
  • Thank you so much. Service that was provided was done excellent. Very happy and satisfied.

    - Teresa P.
  • I was very happy to see and talk to the men who came to do the work on my attic. They were kind, respectful and quick. Answered all my questions and were efficiently working throughout the whole time. Very nice. I am so happy I had this done. Thank you!

    - Stephanie A.
  • I thank you for your service. Your guys did a great job!

    - Salvador C.
  • The service by Greencat is a great way to improve homes. The service received today by Victor and Jose was awesome. They were very pleasant, friendly and explained the process, and answered all our questions.

    - Rudy G.
  • Enrique and Edgardo arrived on time and were very very friendly, polite and respectful. They went right to work, did an amazing job and cleaned everything up and left it better than it was before!

    - Patricia G.
  • I love your company, Greencat. The workers are nice and hard working. They explained work in detail. They completed work nicely. They took care of my place. Thank you.

    - WooJoung K.
  • Greencat come to my home early and prepared to get the service done in a timely manner. They were professional, polite and did a great job prepping and cleaning up afterwards. I am thankful I decided to move forward with the services.

    - Marguerite H.
  • Greencat came to my home today and did a great job in my home. The techs were fast and professional. I'm excited for my home to be more cozy in the winter and fresher in the summer. Thank you!

    - Sagrario S.
  • The guys that came by today from Greencat were very professional, polite and fast. The work was clean and they answered any question I had. Thank you Greencat!

    - Erica S.
  • You guys did a wonderful job. Thank you guys for not leaving a mess. Also for being nice to us. Overall, I love you guys. Job is 10 out of 10 rating.

    - Jonathan C.
  • The techs that came in and did the installation did a really good job. Quick, clean, professional. It couldn't have been better. We'd recommend them to others!

    - Andres C.
  • Thank you for your service and professionalism. I appreciate the work you guys have done for us. Great service!

    - Alejandra B.
  • We are very pleased and thankful and also with your great staff in completing the job. Very nice, professional and respectful. 

    - Luis A.
  • The service was great. It was fast and easy. They arrived early and were kind. This service will allow our home to be cooler during the summer. It is great.

    - Leticia S.
  • Thank you so much! Our house runs super hot and cold in the winter. Your workers who came to gate were excellent. Within minutes the truck pulled up, both employees ready to do their job. Fast and efficient. Friendy and polite. Thank God for this program.

    - Jody L.
  • Greencat is a great company, the service they are giving us is perfect. The workers are very polite and out-going. They came and finished very fast. Just want want to thank them for taking their time to come out today. We really appreciate it.

    - Julio A.