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Top-Rated Insulation pros in Guasti - Updated Nov 2026

Avatar for Everguard Home Insulation Inc.
Everguard Home Insulation Inc.
4.8(
199
)

Serving Guasti, CA and surrounding areas

Approved

In business since 1959

Free estimates

Emergency services offered

"Everguard Home Insulation was excellent from start to finish. They provided a competitive quote and followed through with timely, efficient, quality work installing attic insulation. Highly recommend for your next home improvement project"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+7

Response time2 days
14 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Pro Insulation, Inc.
Pro Insulation, Inc.
4.6(
118
)

Serving Guasti, CA and surrounding areas

Approved

In business since 2006

Free estimates

Emergency services offered

"I love the insulation. My room has no insulation at all. Every time I entered the room after coming from work, it was like walking in an oven. With the insulation, my room now is cool in the afternoon. The price Pro Insulation, Inc. charged is reasonable. I just love it. It is a good investment."
Wall Insulation job in progress
Completed wall insulation
Response time2 days
36 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Next Level Insulation
Next Level Insulation
5.0(
7
)

Serving Guasti, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Jesus and his crew at Next Level Insulation completed my attic needs (Insulation & cleaning) flawlessly. They are true professionals! Jesus was very responsive in keeping appointments, providing a quote and completing the job. He explained the job they were preforming and kept me informed every step of the way. I truly recommend Next Level Insulation."
attic insulation
New R21 insulation
attic vaccumed
new build
box truck

+33

Response time1 day
Response rate95%
Avatar for Alpha Insulation
Alpha Insulation
4.6(
17
)

Serving Guasti, CA and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"Miguel, with Alpha Insulation, was fantastic to work with. Excellent communication, quality work, and fair prices! Would definitely recommend. If you have any insulation needs, Alpha Insulation is the company to call!"
Blow In
Insulation Removal and Air Seal
Insulation Removal
Air Seal
Air Seal

+46

Response time3 days
31 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for Fibers Insulation
Fibers Insulation
5.0(
5
)

Serving Guasti, CA and surrounding areas

Approved

In business since 2025

Free estimates

Small jobs welcome

"I couldn't be happier with the experience I had with this company. From start to finish, they were extremely professional, honest, courteous, and respectful of our home. They did an excellent job blowing insulation into our attic, and they made sure to keep everything clean and tidy throughout the entire process. What I especially appreciated was dealing with a family-owned business consisting of a father and his two sons. It's refreshing to see a family take such pride in their work and treat their customers with honesty and respect. Their pricing was also very reasonable, especially considering the quality of their work. It's not often you find a company that checks all the boxes: great workmanship, fair pricing, professionalism, and integrity. I would highly recommend them to anyone looking to have insulation work done. They definitely earned my five-star review!"
12 neighbors recently requested a quote
Avatar for Phoenix Insulation Inc.
Phoenix Insulation Inc.
5.0(
1
)

Serving Guasti, CA and surrounding areas

Approved

In business since 2020

Free estimates

Credit card accepted

"I was very satisfied on efficiency these guys were working on my home ! Making my home feel like home again ! I’ll recommend them again 🫶and very affordable btw! thanks to them it saved me a lot of money ! Phoenix insulation is the best ! Thank you !"
Gallery
13 neighbors recently requested a quote
Avatar for Insulation Labs
Insulation Labs
4.9(
122
)
Insulation - Install or Upgrade

Serving Guasti, CA and surrounding areas

In business since 2010

Free estimates

Emergency services offered

"The professionalism and quality that the Insulation Labs team demonstrated from beginning to end should serve as a Master Class for any other service oriented company. Scheduling the estimate was effortless with clear, helpful and efficient communication from Diana, their first line of contact. Abraham arrived to do the estimate visit with kind patience and knowledge. He took the time to help us figure out how best to approach the insulation and was more than willing to answer all of our many questions. When we received the estimate we were appreciative of how easy it was to read and understand what the plan was. We knew exactly what to expect and how much it would cost. Today was the day of the insulation. Chris, Tzoc, and Moises spent a long full day doing the entire job. Throughout they were kind, professional, and did an outstanding, neat job. At all times, they cared for our space as if it were their's. We are so glad we chose Insulation Lab. There is no question we would recommend them to anybody."
Insulation | Batt Removal & Replacement | Los Angeles | Insulation Labs
Completed installation of solar panels | Insulation Labs | Los Angeles
Roofing Projects
Spray Foam insulation is a great choice of insulation for attics, walls, and crawl spaces.
Batt Insulation | Removal & Replacement | Los Angeles | Insulation Labs

+138

Recommended by98%of homeowners
Avatar for Elite Thermal
Elite Thermal
5.0(
18
)

Serving Guasti, CA and surrounding areas

In business since 2021

Free estimates

Warranties offered

"Excellent and clear communication by David from bid to job completion. Had stucco walls insulated, which included drilling two holes per stud cavity, filling with fiber insulation, plugging holes with styrofoam, patching stucco, and finally painting to match the existing house color. Paint work went above and beyond to ensure that the new paint blended properly into the existing house. Most other insulation companies won't bother with the fine details like paint - it's really nice to have it all done by one person for nearly the same as just the insulation done by someone else."
Recent Remove & Replace for Attic Insulation
Insulation/Thermal Photos
Insulation/Thermal Photos
Insulation/Thermal Photos
Insulation/Thermal Photos

+10

Response time2 days
Response rate97%
Recommended by100%of homeowners
Avatar for Attic Masters insulation Services
Attic Masters insulation Services
4.8(
111
)

Serving Guasti, CA and surrounding areas

In business since 2010

Free estimates

Emergency services offered

"i can only say good things about working with Attic masters. Great communication, They came on time, protected our floors and hallway from insulation dust, took pictures of the before and after for us so we can get the rebate. overall, very easy and stress free company to work with. I would definitely use again, it was a pleasure to work with true professionals."
HVAC Duct Replacement
Insulation Installation & Attic Cleaning
Air Sealing & Rodent Proofing
New Construction
Vapor Barrier Install

+204

Recommended by94%of homeowners
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FAQs for insulation service projects in Guasti, CA

Old insulation should be removed when it shows damage, contamination, or heavy deterioration. If you notice water stains, rodent droppings, mold, or large gaps, plan on taking it out to protect your home’s energy performance and indoor air quality. Removing compromised material eliminates health hazards, cuts energy loss, and sets the stage for a safer, more efficient attic—all while keeping utility bills in check.

R-value measures how well insulation resists heat flow—the higher the number, the better it slows heat transfer. The right R-value keeps your home warmer in winter and cooler in summer, saving energy year-round. Match the rating to your climate zone and have a pro verify performance over time, because moisture or settling can lower R-value and cut efficiency.

Attic insulation can stay in place for 80 to 100 years, but its performance often drops after the first 15. As dust, moisture, or mold build up, the material loses R-value and allows heat to escape. Schedule periodic inspections so a pro can tell you when replacement makes sense—helping you keep energy bills down and indoor comfort up.

You can over-insulate an attic. Beyond the recommended R-value, extra layers don’t add efficiency and can trap moisture, leading to mold or reduced performance. A local insulation pro can measure current levels, confirm the right target for your climate, and advise on any adjustments so you avoid future energy or maintenance headaches.

Insulation can be damaged by mold, pests, water leaks, or accidental electrical contact. When the material is compromised, it loses R-value and can introduce health hazards. Removing and replacing affected sections restores efficiency, while routine inspections from a qualified pro help you catch problems early and keep your attic safe and energy-smart.

The Guasti, CA homeowners’ guide to insulation services

From average costs to expert advice, get all the answers you need to get your job done.

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