Demilec Home Energy Audit in Sunnyvale: What to Know First
A Demilec home energy audit in Sunnyvale typically takes 2 to 3 hours and costs between $295 and $495, depending on the size of the house and which diagnostic tests you need. We perform these audits as an independent Demilec service provider, which means we’re not tied to any manufacturer’s sales pitch. We just tell you where your Demilec spray foam or Demilec-branded insulation is losing the fight against your utility bill.
This page is for Sunnyvale homeowners who have Demilec insulation in their walls, attics, or crawl spaces, or who are considering Demilec products and want a straight answer before spending money. If you’ve noticed a room that won’t hold temperature, a musty smell near the roofline, or an energy bill that climbs every year without explanation, call us at (669) 215-4805. A real person answers, day or night.
How Demilec Products Fail – and How We Fix Them
Demilec makes good insulation. But in Sunnyvale’s climate – damp winters, hot dry summers, and marine air that moves in most afternoons – even solid products develop problems. Here’s what we actually find on audits:
- Heatlok HFO Pro shrinkage at the rim joist. This is the big one. Demilec’s Heatlok HFO Pro closed-cell foam can shrink slightly if it was installed during cool weather or applied too thick in one pass. We see hairline gaps at the rim joist in older Sunnyvale ranch houses near Murphy Avenue, and those gaps let conditioned air pour into the crawl space. The fix is usually targeted air sealing plus a touch-up application, not a full removal.
- Airmetic Soy 200 open-cell foam absorbing moisture in vented attics. Open-cell foam moves vapor, which is fine in a sealed assembly but trouble in a vented attic with skyrocketing humidity. We’ve audited homes where the Demilec Airmetic Soy 200 near the eaves felt damp to the touch, sagged, and lost R-value. The fix starts with correcting the ventilation before any reapplication.
- Sealection 500 settling in cathedral ceilings. Demilec’s Sealection 500 is a half-pound open-cell product used in cavity fills. In steep cathedral ceilings – common in the hillside homes overlooking Sunnyvale – we’ve seen it settle an inch or two within five years. That leaves a thermal void along the top edge of the ceiling. The fix requires dense-pack or closed-cell touch-up, not just adding more of the same.
- Poor substrate adhesion on painted or dusty drywall. This isn’t a Demilec defect; it’s a prep failure. Foam peels away from a dusty or painted surface, creating invisible channels. On an audit, thermal imaging shows the signature cold streaks. Fixing it means cutting out the lifted area, cleaning the substrate, and re-spraying.
- UV degradation of exposed foam in unfinished garages. Spray foam breaks down in direct sunlight, and Sunnyvale gets plenty. Any exposed Demilec foam in garages or bonus rooms needs a flame barrier or coating anyway, but UV damage accelerates surface crumbling. We flag it during audits because it’s an easy safety and efficiency fix most homeowners never think about.
Our Demilec Home Energy Audit Process
Here’s how a Demilec home energy audit works when you call Walt’s Insulation:
- 1
We walk the house with you. You show us the rooms that feel drafty or stuffy. We ask when you first noticed the problem and what you’ve tried already. No clipboard-only inspections here.
- 2
We run a blower door test. This depressurizes the house and shows us exactly where air is leaking through or around your Demilec insulation. It’s the single most useful test we run in Sunnyvale.
- 3
We scan with a thermal imaging camera. Insulation failures don’t hide from infrared. We photograph every suspicious area so you can see the problem yourself.
- 4
We inspect the ductwork. If your ducts run through unconditioned space – common in the older homes in Sunnyvale – we run a duct leakage test. Leaky ducts can waste 30% of your heating and cooling, even with perfect insulation.
- 5
We sit down and explain what we found. You get a written report with photos, test results, and our recommendations in plain language. If something doesn’t need fixing, we say so.
- 6
We quote the fix, if you want one. No pressure, no same-day sales pitch. Every repair we recommend carries the Done Right Promise. If it’s not done right, we make it right.
What Demilec Home Energy Audit Costs in Sunnyvale
Straight numbers, because that’s how we do things. A standalone home energy audit with blower door testing and thermal imaging runs $295 to $495 for most single-family homes in Sunnyvale. If you add a duct leakage test, it’s another $150 to $200 depending on the size of the system.
| Service | Typical Sunnyvale Price Range |
|---|---|
| Full energy audit (blower door + thermal imaging) | $295 – $395 |
| Duct leakage test (added to audit) | $150 – $200 |
| Air sealing touch-up after audit | $400 – $1,200 |
| Targeted Demilec foam repair (small area) | $500 – $1,500 |
What moves the price? Square footage is the biggest factor. A 1,200-square-foot bungalow near downtown Sunnyvale takes less time than a 3,500-square-foot hillside place. Multiple stories and complex crawl spaces add time too. Estimates are always free, and there’s no trip charge inside our service county. Call (669) 215-4805 for an exact number.
Why Sunnyvale Homeowners Call Walt’s Insulation for Demilec Work
We’ve been doing this since 2000, and we’re still the one down the road, not a dispatch center three states over. When you call about a Demilec insulation issue in Sunnyvale, you get a live person – at 2 a.m. if that’s when the worry hits. Our techs are background-checked and uniformed, so you know exactly who’s walking through your door.
Most insulation companies only know one brand. We work with Owens Corning, Rockwool, Icynene, Johns Manville, CertainTeed, Knauf, GreenFiber, and Reflectix, plus Demilec. That matters on an audit because we’re not trying to push you toward whatever we happen to sell. We look at what’s actually wrong and tell you the truth. Walt Brenner started this company with one rule: do the assessment before recommending anything. The wrong product installed perfectly still wastes your money. Every job we do is backed by our lifetime Done Right Promise. If it’s not done right, we make it right, no runaround.
FAQs
No. A home energy audit is diagnostic work – it doesn’t modify your insulation in any way. Demilec warranties apply to material and installation defects, and having an independent audit performed won’t affect those terms. We don’t touch anything until you approve a specific repair, and when we do, we use warranty-safe practices.
Plan on 2 to 3 hours for most homes. The blower door test takes about 30 minutes, thermal imaging takes another 45 to 60 minutes depending on the house, and the walkthrough and report review fill out the rest. Larger homes or those with complicated crawl spaces can run longer.
Sometimes. Small air sealing jobs and minor foam touch-ups can often be done the same visit if you decide to move forward after reviewing the findings with us. Larger repairs need scheduling so we can bring the right equipment and materials. Call (669) 215-4805 and we’ll give you a realistic timeline.
Repair is almost always cheaper unless the damage is widespread. Most Demilec failures we find in Sunnyvale homes are localized – a rim joist gap, a settled section, a damp corner. Targeted repair runs $500 to $1,500. Full removal and replacement can run $8,000 to $20,000 depending on square footage and accessibility. We’ll tell you if repair makes sense, and we’ll also tell you if it doesn’t.
Yes. As an independent Demilec service provider, we audit and repair Demilec products regardless of who installed them. You don’t need the original installer to make things right, and you won’t get a lecture from us about choosing someone else the first time. We just want the house to work the way it should.
Written by Walt Brenner, Owner, Walt’s Insulation at Walt’s Insulation, serving Sunnyvale and nearby areas.