What we cover
What insulation services does Longmont Colorado Insulation cover?
Twenty-one service pages, one principle: tell you what your home actually needs, not what's easiest to sell. The right material and scope depend on your home's age, its construction, and which rebate programs actually apply to your specific address.
We focus on retrofit insulation upgrades for existing homes. Builders and general contractors working new construction or additions have a dedicated page with per-square-foot pricing and code-compliance details instead.
Why insulate
Why does this market need a different rebate conversation than most Front Range sites?
Longmont's housing stock skews older than a lot of the Front Range: roughly 4 in 10 housing units across this four-town service area predate 1990, old enough that original attic insulation, where it exists at all, is a reasonable bet to be running under today's target (Census Bureau American Community Survey 5-year estimates, 2020-2024).
What makes this market different isn't the housing — it's the utility map. Longmont Power & Communications, the city's own municipal electric utility, doesn't cover the whole city, and it doesn't serve Lafayette, Louisville, or Niwot at all — those three towns are confirmed Xcel-electric. Two homes a few blocks apart in Longmont can have different electric utilities, and only one of them can access the Efficiency Works rebate below.
Every quote from this site starts with checking which utilities actually serve your address, not assuming from your town or your neighborhood.
Rebates & credits
What rebates can homeowners in this service area claim?
Xcel Energy — applies to every address in this service area, regardless of electric utility:
- Xcel Energy Insulation and Air Sealing Rebate — pays a percentage of project cost for gas-heat customers against per-measure caps; ask your contractor for the current rate. A reduced tier applies to Xcel electric customers with central air conditioning whose heating fuel is not provided by Xcel Energy. Requires a participating contractor and, unless a first blower door test already finds the home tight enough by Xcel Energy's own measure, a documented 20% reduction in CFM50. Excludes new construction, additions, garages, sheds, and mobile homes.
Efficiency Works — Longmont Power & Communications electric customers only, not every Longmont address, and not Lafayette, Louisville, or Niwot:
- Efficiency Works Retrofit Rebate — pays a per-square-foot incentive for most insulation measures, a separate per-square-foot rate for flat-ceiling attic insulation, and a tiered flat payment for air sealing based on measured reduction in air loss from a blower door test; ask your contractor for the current rates. Requires an Efficiency Works assessment first and applies only to residential electric customers of Longmont Power & Communications — the Colorado Geospatial Portal's own utility-territory data puts that at roughly 61% of Longmont by area, and none of Lafayette, Louisville, or Niwot, which are confirmed Xcel-electric.
Boulder County EnergySmart — income-qualified only as of January 1, 2026:
- Boulder County EnergySmart — for households at or below 100% of area median income, 50% of project cost up to an annual cap the county publishes on its own program page, subject to R-60 attic / R-19 wall / R-30 sub-floor minimums and required blower-door testing.
These are three separate programs from three separate sources. Efficiency Works' own table pairs an Xcel figure with its own and totals them, but that Xcel figure doesn't match any Xcel per-measure cap we've independently verified. We've found nothing that addresses Boulder County EnergySmart alongside either. Ask your contractor to confirm which apply to your specific address before you assume a total.
According to Xcel Energy, its Insulation and Air Sealing product write-up requires a pre-improvement blower door test in CFM 50 — cubic feet per minute at 50 pascals — on any project that has not already had a recent home energy audit that included one; unless that test finds the home already tight enough by Xcel Energy's own measure, air sealing is required and a post-improvement test must show at least a 20% reduction in air leakage before attic or wall insulation can qualify for a rebate, and the insulation measures carry R-value conditions of their own beyond the blower-door result.
According to Efficiency Works (Platte River Power Authority program, for Longmont Power & Communications electric customers), Efficiency Works pays a per-square-foot incentive for most insulation measures (conditioned crawl space, basement wall, cantilever floor, exterior wall, cathedral ceiling, conditioned attic) and a separate per-square-foot rate for flat-ceiling attic insulation, available only to residential electric customers of Longmont Power & Communications, with the current rates published on its own incentive sheet.
For current Xcel rebate amounts and program rules, see the Xcel Energy insulation and air-sealing rebates page. For Efficiency Works eligibility and current incentive values, see Efficiency Works home rebates. For Boulder County EnergySmart's current income limits and rebate amounts, see Boulder County EnergySmart rebates. Eligibility may depend on which electric utility serves your address, program funding levels, and qualifying product specifications.
Tools
Free calculators and tools
How it works
What happens after you request a quote?
Tell us about your home
Thirty seconds — your address, what you're seeing (drafts, high bills, uneven temperatures), and how to reach you.
A local pro reviews your request
An independent contractor confirms which work makes sense for your home's age and which rebate programs actually apply to your specific address.
Free in-home estimate
No cost, no obligation. The contractor checks existing insulation depth, air leaks, and ventilation before quoting — not guessing from square footage.
You decide
If the math works for your home, you'll have a written quote. If it doesn't, we'll say so — deposits, scheduling, and warranty terms are between you and the contractor.
Learn more
Not ready for a quote? Start with the guides.
Twelve depth guides cover diagnostics (ice dams, attic mold, failing insulation), materials (vermiculite identification, cellulose vs fiberglass, spray foam types), building science (crawl space conditioning, ventilation vs air sealing, vapor barriers, HVAC sizing), and what an insulation project actually involves.
Get a quote
Tell Us About Your Home
30 seconds to fill out. Free quote, no high-pressure follow-up.
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 — ask what R-value your contractor is quoting to, in writing, and confirm the figure your permit is reviewed against with the City of Longmont's building department. (2) Air sealing scope — insulation alone does nothing if air leaks aren't sealed first, and Xcel requires a blower door test to rebate it. (3) Rebate handling — ask which programs your specific address qualifies for. Xcel and Efficiency Works are separate programs with separate paperwork, and not every address qualifies for both. (The federal IRA Section 25C tax credit ended December 31, 2025 — no federal insulation credit applies to 2026 work. Xcel Energy's insulation and air-sealing rebate remains active for its gas and electric customers. Longmont Power & Communications electric customers may separately qualify for an Efficiency Works rebate — check your bill to see which utility serves your address. Boulder County EnergySmart pays a third, income-qualified-only rebate as of January 1, 2026.) (4) Removal scope — older homes often need old insulation removed before new install. If a quote skips all four, get another quote.
Frequently asked
What do homeowners in this service area ask most?
Do you serve all four towns the same way?
Longmont is genuinely two-utility (Xcel plus, for LPC-electric customers, Efficiency Works). Lafayette, Louisville, and Niwot are confirmed Xcel-electric, so their pages use the single-utility Xcel rebate shape — Efficiency Works isn't mentioned on those pages because it doesn't apply there.
How do I know if I have Longmont Power & Communications or another electric utility?
Check your electric bill — the utility name is on it. LPC bills come from the City of Longmont; Xcel, Poudre Valley REA, and United Power are the other three possibilities for this service area. Xcel's gas-and-electric insulation rebate applies regardless of which of the four serves your address.
Do the Xcel and Efficiency Works rebates add together?
We can't independently confirm that they do. Efficiency Works publishes an illustrative combined total — its incentive sheet lists an Xcel figure beside its own and adds the two for one example attic project — so a published source does address the combination. This site doesn't adopt that total: Xcel's own rebate sheet is silent on it, and the Xcel figure in Efficiency Works' table doesn't match any Xcel per-measure cap we've independently verified. Ask your contractor or the programs directly before counting on Efficiency Works' combined figure.
Should I get a quote if my home was built after 2010?
Probably not yet. Post-2010 homes were built to recent code, with insulation well above the pre-1990 baseline. If your bills are normal and comfort is fine, hold the money — the 10-15 year mark is typically when settled batts and unsealed penetrations start costing you.
Is there a cost to request a quote?
No. The in-home estimate is free and comes with no obligation. If the math doesn't work for your home, the contractor will tell you straight rather than push a sale.