What Sunnyvale Homeowners Say About Walt’s Insulation
Reviews matter in a town like Sunnyvale because the homes here are not all the same. A 1950s Eichler in Cherry Chase has different insulation needs than a two-story in Birdland or a rancher near Serra Park. We have been knocking on doors here since 2000, and the feedback we get back tells us whether the work actually did what it was supposed to do: cut the PG&E bill, quiet the house, keep the rooms comfortable in August. We do not buy reviews, and we do not script them. The words below come from homeowners who called us, let us into their attics and crawl spaces, and then took the time to say how it went.
Recent Reviews
“Walt’s crew pulled out the old fiberglass batts in our attic and found gaps around the can lights that had been leaking air for who knows how long. They air sealed everything, blew in Owens Corning to R-38, and our upstairs finally stays under 80 degrees without the AC running all afternoon. The quote matched the final bill exactly.”
Claudia H., Cherry Chase, Sunnyvale
“We had the crawl space encapsulated after years of musty smells in the hallway. The vapor barrier went in clean, the seams are taped right, and the difference in indoor air quality was noticeable within a week. They even pointed out a rodent entry point under the foundation vent and sealed it while they were down there. ” “
Ryan W., Ponderosa Park, Sunnyvale
“I called at 11 at night expecting a message machine and a real person picked up. That alone told me this was a different kind of company. They came out two days later, walked the attic with me, and suggested air sealing before adding more blown-in insulation. No upsell, just straight answers. The work is clean and the paper backing on the new batts is installed right side out, which the last crew clearly didn’t bother with.”
Rafael R., Lakewood Village, Sunnyvale
“Our 1960s walls had almost nothing in them. Walt’s team did dense-pack Rockwool and the rooms now hold heat in January instead of dumping it through the siding. They cut small holes, filled them, patched the drywall, and you cannot tell where the work happened. Background-checked techs matter to me; I have a daughter at home and I knew exactly who was walking through the door.”
Javier M., Serra, Sunnyvale
“The old attic insulation was full of rat droppings and shredded newspaper from the 1970s. Walt’s removed everything, sanitized the space, rodent-proofed the eaves, and installed new Johns Manville batts. The crew wore booties inside the house and vacuumed the hallway after every trip back and forth. The Done Right Promise is real; one section of baffle insulation needed a correction a month later and they came back and fixed it without a single question.”
Claudia H., Cherry Chase, Sunnyvale
“Got a second opinion from Walt’s after another company quoted me $9,000 for spray foam. Walt Brenner himself came out, checked the roofline, and told me Icynene open-cell was the right call for our climate but that the other quote had padded the square footage by a third. His price was fair, the install took one day, and the attic now stays within ten degrees of the living space. I sent the Done Right Promise paperwork to my insurance company.”
Rafael R., Lakewood Village, Sunnyvale
Why Customers Trust Us
The reviews above mention specific things because we do specific things. We answer the phone with a live person at (669) 215-4805, any hour, no answering service. We hire background-checked, uniformed technicians who respect your house and your family. We carry manufacturer materials from Owens Corning, Rockwool, Icynene, Johns Manville, CertainTeed, Demilec, Knauf, and GreenFiber, and we install them to the manufacturer’s spec, not just whatever is fastest. We are locally owned and owner-operated. Walt Brenner has a published address and a real license number in Sunnyvale, not a PO box or an 800-number call center. And every job, no exceptions, carries the Done Right Promise: if it’s not done right, we make it right, for as long as you own the home. You will not get a runaround, just a crew that shows up and fixes what needs fixing. Plus, seniors and veterans always save 10%, and a free second opinion on any written estimate costs you nothing. Call (669) 215-4805 and talk to us about your attic, your walls, or that crawl space you have been avoiding.
Written by Walt Brenner, Owner at Walt’s Insulation, serving Sunnyvale since 2000.