Should I remove old attic insulation before adding new?

• <div><p>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: </p><ul><li><p>If the insulation is over 15 years old</p></li><li><p>If the insulation is wet or moldy</p></li><li><p>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></p></li><li><p>If you see signs of pest infestation</p></li></ul><p>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</p></div>

Do insulation companies need to be licensed?

• <div><p>In some areas, insulation companies require a special license, while some states only require them to hold general contractor licenses. Some municipalities may not mandate any license, although you should always ensure a contractor is fully insured. You can use Angi’s <a href="https://www.angi.com/angi-license-check.htm">license lookup tool</a> to confirm whether or not an insulation contractor you’re considering holds the necessary license for your area. You can also contact the company for information regarding licenses, certifications, and insurance.</p></div>

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Verified Reviews for Doorbell Installation pros in Altadena, CA

*The Angi rating for Doorbell Installation companies in Altadena, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

*The HomeAdvisor rating for Doorbell Installation companies in Altadena, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

Last update on July 18, 2026

Reviewed in July 2026
The new garage door opener was installed quickly and professionally. Everything was tested before completion, and the system works quietly and reliably every day.
GARAGE DOOR PASADENA CA
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Reviewed in July 2026
The garage door opener was installed quickly and works perfectly. It operates quietly, responds instantly, and has made using the garage much more convenient.
Pattern Garage Doors
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Reviewed in July 2026
The garage door installation was completed with precision, delivering secure fitting, smooth operation, and long-lasting dependable performance.
Garage Door Pasadena
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Reviewed in August 2025
Brilliant installation experience. The team put in a lot of effort to ensure silent operation and correct alignment. The final consequence is a garage door that always works perfectly and looks great.
Garage Door of Pasadena
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Reviewed in February 2025
Excellent – William took care of our issue with our Ring doorbell immediately and we're very grateful! THANK YOU!
Garafano Electric, Inc.
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Reviewed in October 2024
Everything went well after we finally made contact. Installation was done about two weeks after the quote was received. The installers noticed a modification that would make for a better installation, and took care of it on their initiative. Price seemed fair for the value.
PASADENA AWNING CO
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Reviewed in March 2024
On time, excellent install, patient tutoring, knowledgeable and very reasonable!
Professional Home Automation and Security LLC
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Reviewed in June 2023
It was truly a pleasure working with Zeon Electric. From our initial contact to the completion of the doorbell installation the level of customer service and professionalism was simply outstanding. Itâ s now Zeon Electric for all of our electrical projects! Many Many Thanks!!!
ZEON ELECTRIC
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Reviewed in April 2023
Marcus installed a Google Nest doorbell and Nest Camera with floodlights at our house. His work was high in quality, I liked working with him, and I would hire him again. I want to add that he waited patiently and helped while I spent 2 HOURS on the phone with Google tech support only to...
MJ Mixon Low Voltage Systems
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Reviewed in September 2021
Mike and and Gabriel were very helpful during the installation. We thank them Jose & Zarina
BMO Kitchen & Bath Renovations
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Doorbell Installation questions, answered by experts

Insulating a detached garage won't reduce your home's heating or cooling bills—and insulating an attached garage will only have a small effect on your home's energy efficiency. However, insulating an attached garage can reduce the transfer of heating and cooling to and from the outdoors, which can reduce the amount of energy your home needs to stay comfortable. Also, having an insulated garage is just more pleasant. Balance the cost of insulating your garage with how you'll use the space to determine if the project is worth it.

Doubling the insulation in your home also doubles the R-value of said insulation. In other words, by adding more insulation, you can reduce the heat loss by half. Most homes benefit from increasing insulation. Older homes, in particular tend to have less insulation as is, so doubling your insulation could drastically reduce your energy bills, keep your home more comfortable, and take the strain off your HVAC system.

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation:

If the insulation is over 15 years old
If the insulation is wet or moldy
If it is vermiculite insulation
If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

In some areas, insulation companies require a special license, while some states only require them to hold general contractor licenses. Some municipalities may not mandate any license, although you should always ensure a contractor is fully insured. You can use Angi’s license lookup tool to confirm whether or not an insulation contractor you’re considering holds the necessary license for your area. You can also contact the company for information regarding licenses, certifications, and insurance.

Yes, professionals install and upgrade insulation for all home or business areas.

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