Insulation Company in Ontario, CA
Blown in insulation is the most common retrofit we install in Ontario, and for good reason. The city’s 1950s through 1970s ranch homes off Holt Boulevard and Euclid Avenue were built when energy was cheap and attic insulation was an afterthought. Now those attics bake at 150°F plus all summer, and the settled R-7 batts up there are barely slowing that heat down. Hometown Insulation Co has served Ontario since 2013, and we match the insulation method to the house, not the other way around. Call (877) 265-9918 for a free estimate from a crew that only does insulation.
Why Ontario Homes Are Different
Ontario sits deep in the Inland Empire’s inland valley, where summer days over 100°F are routine and attic temperatures climb past 150°F. Insulation here is not about keeping heat in. It is about keeping heat out. Homes in ZIPs 91761, 91762, and 91764 are mostly single-story tract ranches built between the 1950s and 1970s, and many still have their original fiberglass batts or rock wool. Over 50 to 70 years, that material settles, compacts, and loses most of its R-value. We regularly measure R-7 or less in attics that current California Title 24 thinks should be at R-38 or higher.
The newer infill and master-planned communities around 91758 and 91798 were built to modern code, but they still face the same inland heat. Even a code-built attic from 2010 struggles when July hits 105°F for a week straight. Radiant barrier foil is almost nonexistent across Ontario’s older housing stock, and that single upgrade can drop attic temperatures by 20 to 30 degrees. That directly cuts cooling bills. If your rooms get hotter than your thermostat setting by 4 p.m., the attic is usually the culprit.
Our Main Ontario Services
Most Ontario homeowners call us about two things: re-insulating an old attic and sealing the building envelope with spray foam. Both get their own deep pages, because they are different jobs with different materials and different price logic.
Attic Insulation in Ontario
Attic insulation in Ontario usually means blowing new material over old, settled batts, or removing the old stuff entirely and starting fresh. In the older tracts around 91761 and 91764, we often find original 1960s rock wool that has compacted to a fraction of its rated R-value. Adding cellulose or fiberglass on top can work, but sometimes removal is the only honest fix. Ontario’s heat makes attic work time-sensitive; we schedule early morning crews whenever possible so the material cures and settles before the afternoon peak. Read the full breakdown here: Attic Insulation in Ontario.
Spray Foam Insulation in Ontario
Spray foam in Ontario earns its keep by sealing the leaks that let hot air pour into the house while your AC runs full tilt. We install Icynene open-cell and Demilec closed-cell foams, and the choice between them depends on your roofline, venting, and whether the attic is conditioned space. In Ontario’s dry inland climate, closed-cell also adds structural rigidity, which matters on older ranch homes with original roof framing. Hometown Insulation Co has served Ontario since 2013 with foam crews trained on these two brands specifically. Details here: Spray Foam Insulation in Ontario.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Blown In Insulation in Ontario
Blown in insulation in Ontario is the fastest, most cost-effective way to bring an under-insulated attic up to something close to modern code. Most of the homes we work on in Ontario were built between 1950 and 1980, and their attic insulation has settled to R-7 or worse. Add 150°F attic temperatures in July and August, and you get upstairs rooms that never reach the thermostat setting, plus AC bills that climb every year. We blow cellulose or fiberglass to R-38 or higher, and we can add radiant barrier under the roof deck on the same visit. Hometown Insulation Co has installed blown in insulation in Ontario since 2013, and we are a dedicated insulation company, not a general contractor. Learn more about the method itself on our Blown In Insulation page.
Cellulose Insulation
Signs you need it
Your attic has old, settled batts that measure under R-19, and your upstairs rooms run 8 to 10 degrees hotter than the rest of the house in summer.
What it costs in Ontario
Blown in cellulose attic insulation in Ontario runs $0.90 to $1.60 per square foot, depending on depth and whether we remove old material first.
How we do it
We air-seal the attic floor, mark target depth, and blow GreenFiber cellulose with a dense-pack setting so it fills corners and won’t settle like loose batts.
Blown In Attic Insulation
Signs you need it
Your attic insulation is uneven, with bare spots over some rooms, and your AC runtime keeps climbing even after you have serviced the unit.
What it costs in Ontario
Blown in attic insulation in Ontario typically lands between $1,500 and $3,400 for a 1,200 to 1,800 square foot attic at R-38.
How we do it
We remove or top up the existing material, seal around light fixtures and vents, then blow to even depth and check R-value with a gauge.
What Blown In Insulation Costs in Ontario
| Item | Typical range in Ontario |
|---|---|
| Blown in cellulose, per sq ft | $0.90 – $1.60 |
| Blown in fiberglass, per sq ft | $1.10 – $1.80 |
| Attic air sealing, whole attic | $400 – $1,000 |
Is blown in insulation worth it in Ontario?
In Ontario’s summer heat, yes. Attics here routinely hit 150°F, and bringing insulation from R-7 to R-38 cuts attic heat transfer dramatically. Most Ontario homeowners see lower cooling bills the first full summer after the install. Call (877) 265-9918 for a free estimate.
How long does blown in insulation last in Ontario?
Cellulose blown in correctly holds its R-value for 20 to 30 years in Ontario’s dry climate. Fiberglass can last longer but is more prone to air movement reducing effectiveness. Call (877) 265-9918 and we will measure what you have now.
Brands We Service in Ontario
We install CertainTeed and GreenFiber blown in products in Ontario, and Icynene plus Demilec for spray foam jobs. The material choice depends on your attic, your budget, and what problem you are solving. For a deeper look at what we carry and why, see our brands.
Pricing for Insulation Company in Ontario, CA
| Service | Typical range in Ontario |
|---|---|
| Blown in cellulose attic insulation | $0.90 – $1.60 per sq ft |
| Blown in fiberglass attic insulation | $1.10 – $1.80 per sq ft |
| Attic air sealing | $400 – $1,000 |
| Attic insulation removal | $1.20 – $2.50 per sq ft |
| Blown in wall insulation (retrofit) | $2.00 – $4.00 per sq ft |
| Spray foam insulation | $2.50 – $5.00 per sq ft |
| Whole-home insulation package | $3,000 – $9,000+ |
| Radiant barrier installation | $1.50 – $3.00 per sq ft |
Attic access, old material removal, and deeper target R-values push Ontario prices to the upper end. You get a written line-item quote before we start, and that number does not change unless the scope changes.
Neighborhoods We Serve in Ontario
We work all over Ontario, from the older ranch tracts near Holt Boulevard and Euclid Avenue to the newer communities in 91758 and 91798. We schedule jobs across Ontario within a day or two most weeks, depending on season.
- Holt Boulevard corridor
- Euclid Avenue tracts
- Ontario Ranch area (91758)
- Archibald Ranch and nearby infill (91798)
- Airport area neighborhoods (91761)
Service Area – Cities Near Ontario
Hometown Insulation Co also serves the surrounding Inland Empire communities. If you are in Montclair, CA, Upland, CA, Chino, CA, or San Antonio Heights, CA, we can schedule the same week in most cases. Give us a call and we will work you in.
Serving Ontario, CA — Our Local Coverage Area
We’re based in the Ontario area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs About Insulation Company in Ontario
We schedule insulation work in Ontario every week, and most estimates happen within a day or two of your call. The install itself usually takes one day for blown in attic insulation, sometimes two for spray foam or removal. Call (877) 265-9918 to get on the schedule.
Re-insulating an existing attic in Ontario does not require a building permit under California residential code, and that covers most of what we do. If your project involves new construction or changing the building envelope, the contractor pulling the permit handles it. We will tell you straight what applies to your job.
We cover all Ontario ZIP codes, including 91764, 91798, 91758, and 91761. If you are inside Ontario city limits, we will get to you. Call (877) 265-9918 and we will confirm your address and get a time on the calendar.
Need attic insulation, spray foam, or blown in insulation in Ontario? Call Hometown Insulation Co at (877) 265-9918 for a free estimate. We will measure what you have, tell you what it needs, and give you a written price before any work starts.
What happens when you call
- 1A real person answersNo phone trees — talk to a local insulation pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3A background-checked tech heads outLicensed & insured, typically within 1-hour.
- 4You approve before work beginsNothing starts until you say go.
What Ontario Customers Say
"Found and sealed a gap around the chimney chase that was basically an open chimney to the attic."
— Luis Vargas"Installed baffles at the soffits so the new insulation didn't block the ventilation, which the previous contractor apparently never considered."
— Daniel Lawson"Handled the utility rebate paperwork, which knocked a real amount off the final cost."
— Steven Kim