Why insulate
Why do Centennial homes need insulation attention?
Centennial's housing is older than its city government — roughly two-thirds of homes here predate 1990, mostly 1970s-80s subdivision stock with a substantial 1990s-2000s wave on top. So this page runs two playbooks: bringing genuinely under-insulated older attics up to spec, and extracting comfort and efficiency gains from newer homes that look fine on paper but underperform in practice.
Builder-grade fiberglass batts settle, sag, and gap within ten to fifteen years. A 2005 Centennial home that started at R-38 in the attic is commonly sitting at an effective R-25 to R-32 today — measured at the joist plane, accounting for compression and gaps. Topping up with blown-in cellulose plus targeted air sealing typically delivers a noticeable winter comfort improvement and a meaningful summer cooling reduction.
Centennial's typical 2,800-square-foot footprint means projects price higher in absolute dollars but the rebate payback math is favorable. The 2026 Xcel Whole Home Efficiency Bonus adds a 25% bonus on all standard rebates when three or more efficiency measures are completed within two years of enrolling — insulation and air sealing together are two of the three; a third measure within that window completes it.
According to ENERGY STAR's Seal and Insulate program, “EPA estimates that homeowners can save an average of 15% on heating and cooling costs (or an average of 11% on total energy costs) by air sealing their homes and adding insulation in attics, floors over crawl spaces and basements.”
Common projects
What insulation projects are most common in Centennial?
The right material and scope depends on your home's age, current insulation, and where comfort or efficiency is falling short.
Attic Insulation
Centennial homes built post-1990 often have intact but settled batts; a 6-10 inch blown-in layer rebuilds the depth those batts lost. The crew measures first, then sets how much more the R-60 target needs.
Wall Insulation
Walls in Centennial homes are generally insulated to code; dense-pack retrofits are usually only needed in specific cold-spot areas.
Crawl Space
Most Centennial homes are slab-on-grade or full-conditioned-basement; crawl space work is less common here than in older suburbs.
Blown-In Insulation
Blown-in cellulose top-ups are the standard Centennial retrofit — quick, clean, and rebate-eligible at the recommended depth.
Spray Foam
Closed-cell spray foam at the rim joist of a finished basement is the highest-leverage spot in most Centennial homes — small area, big leak fix.
Energy Audit
Worth it on any Centennial home over ten years old — finds the gaps and settled spots before scoping the rebate-eligible measures.
Cost & the cost of waiting
How much does insulation cost for Centennial homes — and what does waiting cost?
Centennial homes average around 2,800 square feet, and no primary source publishes a Denver-specific installed cost, so this page doesn't print a figure. Larger Heritage and Cherry Creek Vista homes (3,500+ sq ft) need proportionally more material. The free in-home estimate prices your specific home. Cost drivers specific to Centennial are simpler than older suburbs: usually clean attic access, predictable framing, no asbestos concerns, and no knob-and-tube workarounds. Where Centennial costs can rise: vaulted-ceiling rooms with limited attic access, large bonus rooms over garages requiring knee-wall sealing, and tray ceilings requiring a different approach than flat attics. The 2026 Xcel rebate programs with the Whole Home Efficiency Bonus are reimbursed by check after the application is approved. Xcel also runs income-qualified programs.
Every winter you don't upgrade a pre-1990 attic, you're heating the attic through the ceiling.
According to Xcel Energy, the participating-contractor symbol marks a program that requires customers to use an Xcel Energy participating contractor to install the equipment or make the improvement.
Cost figures are conservative ranges. The free in-home estimate gives exact numbers based on your home, current insulation, and any required pre-work — not a range.
Rebates & credits
What rebates can Centennial homeowners claim?
Centennial is fully within Xcel Energy service territory, with full access to the 2026 Xcel rebate programs including the Whole Home Efficiency Bonus.
- Xcel Energy Insulation and Air Sealing Rebate — standard utility rebate for Xcel heating customers, paid by check after application. Work must be completed by a participating contractor, with a blower door test before and after documenting a reduction of at least 20% in CFM50.
- Xcel Whole Home Efficiency (WHE) Bonus — adds a 25% bonus on all standard rebates when three qualifying measures are completed within two years of enrolling.
- Xcel Insulation + Air Sealing Combo Bonus — a bonus when rebate-qualifying air sealing and insulation are installed before a qualifying space-heating heat pump, within two years of each other by invoice dates; the current bonus amount is set out on Xcel's own program pages.
- Xcel's income-qualified programs — eligibility is set out on Xcel's own program pages.
- Power Ahead Colorado (DRCOG) — Denver-region incentive program. Published policy funds heat pump and heat pump water heater incentives; insulation and air sealing are recommended preparation steps, not incentivized measures. Not yet live.
For current Xcel rebate amounts and program rules, see the Xcel Energy insulation and air-sealing rebates program page. For Colorado-program status (including HEAR closure and Power Ahead Colorado launch), see the Colorado Energy Office Home Energy Rebate page. Eligibility may depend on income, program funding levels, and qualifying product specifications.
Get a quote
Tell Us About Your Home
We've Got It. Here's What Happens Next.
We've got your info and are routing it to a local pro. When they call, here's what to look for in the quote you receive: (1) R-value target — the 2021 IECC sets a ceiling minimum of R-60 in Climate Zone 5 (Table R402.1.3); R-49 qualifies only where uncompressed insulation extends full-height over the top plate at the eaves. (2) Air sealing scope — insulation and air sealing work together; sealing the leaks first is what lets the insulation do its job. If a quote skips both, get another quote. The federal IRA Section 25C tax credit ended December 31, 2025, and Colorado's HEAR single-family program is now closed for both Region 1 (the Front Range) and Region 2. Xcel Energy programs are the ones still paying on Denver-area insulation projects in 2026.
Frequently asked
What do Centennial homeowners ask most about insulation?
Should I do this if my Centennial home was built after 2010?
Not urgently — but 'built after 2010' is not the same as 'done.' Post-2010 Centennial homes typically went up with R-30 to R-38 in the attic, under the R-60 ceiling minimum current code sets for Climate Zone 5B. If your bills are normal and your comfort is fine, the return is slower than on a pre-1990 attic, so it can wait. Where these homes pay back: settled batts and unsealed attic-plane penetrations show up in the 10-15 year window. We'll tell you straight when we look at it.
Does my Centennial home qualify for Xcel rebates?
Most Centennial addresses are in Xcel Energy service territory and qualify for the 2026 Xcel Energy Insulation and Air Sealing Rebate, plus the Whole Home Efficiency Bonus when three or more efficiency measures are completed within two years of enrolling. The pro on your job confirms eligibility against your specific address before scoping work.
How much does attic insulation typically cost for a Centennial home?
Centennial homes average around 2,800 square feet, and no primary source publishes a Denver-specific installed cost, so this page doesn't print a figure. The full quote depends on home size, current insulation level, and required pre-work — the free in-home estimate gives exact numbers, not a range.
Do you serve all of Centennial?
Yes — every Centennial ZIP and neighborhood, plus the surrounding Denver metro. Service areas listed at the bottom of this page show the neighborhoods we work in regularly.
What R-value should I aim for at Denver's altitude?
Denver sits in IECC Climate Zone 5B. Table R402.1.3 of the 2021 IECC sets the ceiling insulation minimum at R-60; R-49 satisfies that requirement only under Section R402.2.1, where the full height of uncompressed R-49 insulation extends over the wall top plate at the eaves. Walls are R-20 cavity by current code (R-13 cavity plus R-10 continuous insulation is another compliant path). ENERGY STAR separately recommends adding R-60 if your attic is uninsulated, or R-49 if you already have three to four inches.
Is upgrading insulation worth it for newer Centennial homes that started out well insulated?
Often yes. R-38 describes the original installation, not what is up there now; settled and gapped insulation degrades within ten years. A 2005 build that started at R-38 commonly sits at effective R-25 to R-32 today — against a current ceiling minimum of R-60. A top-up plus air sealing is rebate-eligible, low-disruption, and pays back via reduced HVAC runtime — particularly meaningful on Centennial's larger 2,800-square-foot footprints.
Service area
Where do you provide insulation services in and around Centennial?
- Heritage
- Cherry Creek Vista
- Willow Creek
- Foxridge
- Walnut Hills
- Piney Creek
- Smoky Hill
- 80111
- 80112
- 80121
- 80122
- 80015
- 80016