Energy Savings & Payback Calculator
Insulation Energy Savings & Payback Calculator — Denver
Most insulation pitches quote a savings number and skip where it came from. This one shows the math: your own annual heating and cooling cost, multiplied by the one average the EPA publishes. No payback period, because nobody publishes a Denver cost to divide by.
Quick reality check: If your home was built before 1990 and your bills keep climbing, you probably need this. If it was built after 2010 and your bills are normal, there is usually still a gap, but the payback is slow enough that it can wait. Either way, we'll tell you straight.
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The calculator
Run the energy savings & payback calculator
Enter what you spend a year on heating and cooling. The calculator multiplies it by 15%, the average the EPA estimates homeowners can save on heating and cooling costs by air sealing and adding insulation in attics, floors over crawl spaces and basements, as published by ENERGY STAR. That is a national average, not a Denver figure and not a promise for your house. Project type and current insulation level do not change the number; they go to the free in-home estimate, which measures your house and prices the work.
Your home + project
A rough estimate is fine here.
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.”
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How this works
How does the energy savings & payback calculator work?
It multiplies one number you give it by one number the EPA publishes: your annual heating and cooling cost, times 15%.
The 15% is the EPA's estimate, published by ENERGY STAR, of what homeowners can save on average on heating and cooling costs by air sealing their homes and adding insulation in attics, floors over crawl spaces and basements. It is a national average for those measures together. It is not a Denver figure, and it does not change with the project type or insulation level you pick, because ENERGY STAR does not publish it broken out that way.
Until September 2026 this tool applied percentages that varied by project type. Nobody published them, so they came out. This one is published, so it is the only one here.
It still prints no payback period. Payback is cost divided by annual savings, and no primary source publishes a Denver installed cost. The free in-home estimate measures your attic, finds the leaks, scopes the work and prices it. Divide that price by the figure above and the payback is yours.
According to the International Energy Conservation Code, the 2021 IECC sets a minimum ceiling insulation R-value of R-60 in Climate Zone 5 under Table R402.1.3, and Section R402.2.1 allows R-49 to satisfy that requirement only where the full height of uncompressed R-49 insulation extends over the wall top plate at the eaves.
Keep reading: Blown-In Insulation Cost in Denver: The Value Play and Attic Insulation Cost in Denver: What Moves the Price.
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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 — Denver's energy code (the 2021 IECC as amended) 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.
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According to the Building America Solution Center, “loose-fill cellulose will settle from 10 to 20 percent over time due to gravity and vibration.”
Frequently asked
What do Denver homeowners ask about this calculator?
Should I use this calculator if my home was built after 2010?
Possibly — but interpret the output cautiously. Post-2010 Denver homes were built to the code edition in force at the time, which set a lower ceiling minimum than the R-60 the 2021 IECC requires — so a newer home can be code-legal as built and still sit short of today's target. If your bills are normal and your comfort is fine, the honest answer is usually: hold the money. The 10-15 year mark is when even code-compliant homes start showing settled batts.
Do you handle new construction insulation?
New construction insulation typically goes through your general contractor or builder, and the process is different — pricing structures, code compliance steps, and project timing all work differently for new builds. If you're working on a new build, we can refer you to a partner with new-construction experience.
Why won't this tool give me a payback period?
Because payback is cost divided by annual savings, and this site can source only one half. The savings half uses the EPA's 15% average, published by ENERGY STAR. The cost half has no source: no primary source publishes a Denver-specific installed cost per project type. Inventing one would make the division look rigorous while resting on a guess. The free in-home estimate prices the work; divide that price by the savings figure and the payback is yours.
Does this account for insulation degradation over time?
Loose-fill cellulose settles 10 to 20 percent over its lifetime, reducing effective R-value. The savings figure here is one national average and does not model settlement, but settlement is why R-60 is the target rather than R-49. R-60 is the code requirement, and the extra depth leaves headroom for it.
What if energy prices go up?
Your dollar savings rise with them, because savings are a share of what you spend. Re-run the calculator with the higher annual cost and the figure moves with it. If you switch to a heat pump, absolute dollar savings shrink even where the percentage does not, because the bill they come out of is smaller.
Do rebates change the savings shown here?
No. Rebates affect the cost side of the payback math, not the energy-savings side. Xcel's insulation and air sealing rebates require an Xcel participating contractor. Get your cost from the free in-home estimate, then apply rebates to that number.
What if I plan to sell before payback completes?
Some studies show insulation upgrades return a meaningful share of cost at sale via higher home value, but that's market-dependent and this tool doesn't estimate it. Before scoping a project, ask whether you'll be in the home long enough for the energy savings alone to matter to you.