Expert Attic Insulation Services in Fresno & Central Valley
Trusted Home Insulation Contractor & Energy Efficiency Specialists in Central Valley, CA
Experience the difference with a family-owned insulation contractor delivering expert insulation, cleaner air, and consistent comfort — with unmatched service and professionalism since 1982. Trusted by thousands of Central Valley homeowners.
- 5-star Google reviews
- Licensed CA contractor
- Free written estimates
- Family owned since 1982
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Call us now: (559) 999-858640+ Years
Since 1982
Family Owned
& Operated
Licensed
CA #1002958
Free Estimates
No pressure
Central Valley
Local team
What we do
Three insulation services, done to the highest standard.
Plus factory-authorized QuietCool attic fan installation to keep your home cool all summer.
Attic Insulation
Blown-in fiberglass attic insulation that lowers energy bills and keeps Central Valley homes comfortable year-round.
Learn moreInsulation Removal, Sanitize & Air Seal
Full removal of old, contaminated, or rodent-damaged insulation — followed by sanitizing, air sealing, and fresh new insulation.
Learn moreWall Insulation
Drill, fill, patch, and texture. Blown-in cellulose insulation retrofitted into existing walls with no drywall demo.
Learn moreQuietCool Attic Fan Installation
Whole-house and attic fans by QuietCool — pull hot air out of your attic and drop indoor temperatures fast.
Learn moreRadiant Barrier Installation
Reflective radiant barrier that blocks radiant heat from your roof before it ever reaches your living space.
Learn more
Why Masterguard
Four decades of doing insulation the right way.
Since 1982, Central Valley homeowners have trusted our family to make their homes more comfortable and more efficient. We use only professional-grade materials — Knauf blown-in fiberglass for attics and Greenfiber cellulose for walls — installed to the R-value your home actually needs.
- Real energy savings — lower heating and cooling bills
- Even, comfortable temperatures in every room
- Air sealing that stops leaks before insulating
- Clean job sites — we protect your home and haul away everything
Recent work
Real Central Valley attics.
Fresno, CA
Popular insulation services in Fresno
From attics and walls to spray foam, radiant barrier, and repairs — explore what we install across Fresno.
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Where we work
Proudly serving the Central Valley
FAQs
Answers before you call.
Still curious? Reach out — we're happy to walk through your specific home.
All FAQsInsulation insights
Guides for a more efficient home
What R-Value Do You Really Need in a Central Valley Attic?
Fresno summers push 105°F. Here's the R-value most Central Valley attics should hit — and why 'just add more' isn't always the right answer.
July 10, 20265 Signs Your Attic Insulation Needs to Be Removed (Not Just Added To)
Rodent droppings, musty odors, compressed batts — some attics need a full reset, not a top-off. How to tell the difference before you spend money.
June 22, 2026QuietCool Whole-House Fans vs. Running the AC: What It Really Costs
A QuietCool draws a fraction of the power your AC does. We ran the numbers on a typical Fresno 3-bedroom to show the summer savings.
June 5, 2026Ready for a comfortable, efficient home?
Free estimates, honest recommendations, and clean, professional installs. Call the family that's been doing it since 1982.