Greencat Technician Applying Blown Insulation In Attic

Wondering how to install insulation in your existing walls?

We've got the process down!


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Over the years Greencat has helped thousands of California residents in Los Angeles, Orange, Western Riverside, and Western San Bernardino Counties fight the summer heat by retrofitting their homes with upgraded wall insulation. We designed, tested, and mastered a unique process that allows us to fully insulate your existing walls in hours rather than days! When you choose Greencat for your project, you are choosing a company that does the job fast, clean, and professionally.

Upgrading Your Wall Insulation Benefits the Whole Home!

Most homeowners only get to see the insulation that exists in their attics, or sometimes even under their floors. But the insulation in your exterior walls provides added protection from outside heat infiltration in the summer, as well as protects against loss of interior heat in the winter. This increases your indoor temperature stability and consistency, while reducing heating and cooling costs all year round.  

Some of the benefits of proper wall insulation include:

  • Increased soundproofing

  • A cooler home in the summer

  • A warmer home in the winter

  • More stable indoor temperatures

  • Reduced need to run your air conditioning equipment

  • Decreased carbon footprint

  • Lower heating & cooling costs

  • Increase your home’s resale value

Is Your Home in Need of an Insulation Upgrade?

How can you know if your home is suffering from improperly installed or insufficient wall insulation? There are a few signs to be on the lookout for, like:

  • Do you feel indoor drafts throughout your home?

  • Are some rooms harder to keep comfortable than others?

  • Does your air conditioner seem to be running constantly in the summer?


Depending on your home’s design and its overall performance, one or all of these symptoms can indicate your home is in need of insulation, particularly in your exterior walls. 

How We Install Insulation in Existing Walls

So how is it that we can upgrade the insulation in your walls after they have been built? The majority of the time, insulating an existing wall is harder than insulating an attic. Here at Greencat, we have been in all types of homes throughout California, and have developed a process to get the job done right, quickly. 


Wall insulation is hidden between the interior and exterior wallcoverings. Removing the exterior wall covering or interior wallcovering to insulate the wall cavity is not really an option (unless you want to replace all of your drywall!). It’s more cost- and time-effective to drill small holes (usually on the exterior) so that we can blow in a fiberglass insulation material using a specialized hose. We then replace the small holes, leaving no trace.

Will Wall Insulation Settle Over Time?

With new blown in fiberglass insulation going in your walls, a savvy homeowner might ask how long that insulation will remain effective. Because this blown in fiberglass insulation is loose fill, it is commonly misunderstood that wall insulation will settle over the years, and become less effective. 


Rest assured, a large part of the Greencat process is installing insulation properly, so that it is densely packed into the wall cavity, eliminating the risk that your insulation will prematurely lose its insulating properties. 

Schedule Your Wall Insulation Upgrade with Greencat!

If you have been curious how your home can benefit from giving your home a clean slate when it comes to insulation, get in touch with our home comfort experts. Here at Greencat, increasing your home comfort is our number one goal!

Have questions about how to install insulation in existing walls? Call Greencat at 323-208-9071 or get in touch here

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.