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The EIA found 13.8% of homes drafty most or all of the time and 41.3% some of the time.
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Home Energy Scope · Planning articles
Energy retrofit guides for homeowners who want the bill to actually drop
This library holds four long-form guides for homeowners planning energy work: project planning, a 2026 cost guide, materials and options, and permits and codes. Each cites published sources such as ENERGY STAR, the EIA, HomeAdvisor, Fixr, EnergySage and Zonda, explains how incentives changed after the federal credits ended in 2025, and ends with questions to put to the professionals who send written estimates.
Planning articles
PlanningHow to plan an energy retrofit so each step makes the next one cheaperPlan an energy retrofit by measuring before buying.
CostsWhat an energy retrofit costs in 2026, from a $200 assessment to a solar arrayIn 2026 a home energy audit runs about $212 to $698, attic insulation about $1,700 to $2,500, a whole-home window project about $3,436 to $11,837, and solar about $2.60 per watt before incentives, according to HomeAdvisor, Angi and EnergySage.
MaterialsInsulation, glazing and solar equipment: choosing materials by the job they doBlown-in fiberglass or cellulose is the standard for open attic floors after air sealing; closed-cell spray foam earns its higher price at rim joists and roof decks.
PermitsPermits and codes for energy retrofits: what usually needs inspection and whyPermit rules vary by city and county, but a pattern holds.
Energy retrofits fail in a particular way. The work gets done, the invoice gets paid, and the utility bill barely moves because the money went to the wrong part of the house. Replacement windows in a home that leaks through the attic, or a solar array sized to a house that wastes a third of its heat, are common examples. These guides are written to prevent that outcome by putting diagnosis, sequence and honest arithmetic ahead of any single product.
Read them in order if you are starting from scratch, or jump in where you are. The planning guide sets the order of work, the cost guide turns that order into a 2026 budget, the materials guide compares insulation types, window frames, glazing and solar equipment, and the permits guide explains which jobs need inspection. Every number is attributed to its publisher so you can check it yourself.
Why every guide here begins with a measurement
ENERGY STAR estimates that 9 in 10 U.S. homes are under-insulated, and Pearl Certification's registry analysis finds air leakage problems in ~90% of homes. Those two findings explain why the envelope usually comes first. They do not tell you where your own house leaks, how much, or whether the ducts are the bigger loss. Only a test answers that, which is why the planning guide opens with the assessment rather than a shopping list.
A diagnostic audit with a blower door costs a few hundred dollars, and Pearl, citing Angi, reports that households acting on audit recommendations save about $685/yr. The value is not the report itself but the fact that it lets you rank upgrades by return and hold a contractor to a measured target. The audit cost calculator estimates the assessment price for your floor area before you call anyone.
How the four guides divide the work
The planning guide covers the sequence that keeps a retrofit from contradicting itself: assess, seal, insulate, ventilate, then consider glass, equipment and solar. It also covers how to phase work over several years and what to gather before an assessor arrives. The cost guide prices each step with 2026 figures from HomeAdvisor, Angi, Fixr and EnergySage, separates labor from materials, and explains why two bids for the same attic can differ widely.
The materials guide compares blown-in fiberglass, cellulose, spray foam and batts; vinyl, wood, fiberglass and clad window frames; glazing packages; and solar panels, inverters and batteries. The permits guide explains the code sections that commonly apply, the inspection sequence for window and solar work, homeowner association review, lead-safe rules for older homes and the practical cost of skipping a permit. The glossary defines the test and label terms used throughout.
- Project planning: what to gather, how to read bills, which assessment to book and how to phase the work.
- Cost guide: 2026 ranges by scope, labor versus materials, regional differences, hidden costs and how to read a bid.
- Materials and options: insulation types, air sealing materials, window frames and glazing, doors, and solar equipment.
- Permits and codes: common code triggers, inspection sequence, homeowner association review and the risks of skipping a permit.
What the housing data says about where the losses are
The EIA's 2024 Residential Energy Consumption Survey microdata gives a rare look at the whole housing stock. Households describe 13.8% of occupied primary residences as drafty most or all of the time, and another 41.3% as drafty some of the time. 62.4% still have mostly original windows, and 33.1% have mostly single-pane glass.
Those figures are self-reported, so they describe how homes feel rather than how they test. They are still useful for setting expectations. Drafts are common, original windows are the norm, and attic work touches roughly half the stock because 47.6% of occupied homes have an attic. The guides use these numbers to explain which problems are typical and which ones suggest something unusual that an assessor should look at closely.
How incentives are handled after the federal credits ended
Until the end of 2025, the Energy Efficient Home Improvement Credit (25C) and the Residential Clean Energy Credit (25D) shaped most retrofit budgets. The IRS confirms that 25C paid 30% up to $3,200 a year for qualifying envelope and equipment work and that 25D covered 30% of solar and battery costs. Both ended for property placed in service after December 31, 2025, so no guide here counts them in a 2026 budget.
What remains is state and utility money. The Department of Energy's Home Electrification and Appliance Rebates program offers up to $14,000 per household where a state has launched it, with item caps such as $1,600 for insulation and air sealing. Utilities also subsidize audits and weatherization. The guides tell you where to look and what paperwork to keep, and the homeowner polls show how many readers have checked their own address.
Using the guides alongside the tools and estimates
The guides explain; the tools apply. The insulation versus windows comparison is the one most readers need first, because it settles the most common spending dilemma. The retrofit quiz checks whether the sequencing logic has stuck. When you are ready to price actual work, a written request that includes utility history, the age of the house and any assessment report gets you estimates that can be compared line by line.
Nothing here replaces an assessor standing in your attic. What the guides can do is make sure you ask the right questions, recognize an incomplete proposal, and avoid paying for an upgrade the measurements do not support. Start with the planning guide, keep the glossary open, and return to the cost guide when bids arrive. Each guide closes with questions you can copy into a request, so every professional who responds addresses the same points.
Homeowner polls
What other planners are choosing
Which would you do first?
EPA estimates sealing and insulating saves about 15% of heating and cooling costs.
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Have you checked state or utility rebates for your address?
The federal 25C and 25D credits ended for property placed in service after Dec 31, 2025.
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Questions homeowners ask
Which guide should I read first if my bills just jumped?
Start with the project planning guide. A sudden jump often has a cause that is not the envelope at all, such as a rate change, a failing heat pump running on backup resistance heat, or a new occupant. The planning guide explains how to separate usage, rates and house performance using a year of bills, and when an assessment is worth booking before spending on insulation or windows.
Do these guides assume I will hire a contractor?
No. They explain what professionals do so you can judge proposals, but several steps, such as gathering utility history, sealing obvious gaps around plumbing penetrations and checking attic depth with a ruler, are reasonable for a careful homeowner. Where a task involves combustion appliances, electrical panels, roof work or spray foam chemistry, the guides say plainly that trained professionals should handle it.
Are the cost figures national averages or local prices?
They are national figures from named publishers such as HomeAdvisor, Angi, Fixr and EnergySage, updated for 2026 where those publishers have released new data. Local prices vary with labor rates, climate zone and housing age. The cost guide explains the regional factors that push a bid above or below the national range so you can tell whether a local quote is reasonable.
Why do the guides keep mentioning the end of 25C and 25D?
Because many online articles written before 2026 still count those federal credits in their payback math. The IRS ended both for property placed in service after December 31, 2025. A solar or window payback figure that includes a 30% federal credit will look noticeably better than what a 2026 project will actually achieve, so the guides flag it wherever it matters.
How often are the guides updated?
Figures are reviewed when their publishers release new editions, which for most cost sources is once a year. Incentive information changes faster, especially as states launch or pause Department of Energy rebate programs. Treat any rebate amount as a starting point and confirm it with your state energy office or utility before signing a contract that depends on it.
Do the guides cover heat pumps and water heaters?
They mention them where sequence matters, because an envelope retrofit usually shrinks the heat pump a house needs. HomeAdvisor puts an average heat pump installation near $6,088, and ENERGY STAR estimates a heat pump water heater saves a family of four about $550/yr. The four core services on this site remain audits, insulation and air sealing, windows and doors, and solar.
Can I share or print a guide for my contractor?
Yes. The guides are written so they can be handed to a professional as a statement of what you expect: a measured baseline, air sealing before insulation, a test-out after the work and a written scope. Printing the relevant section and attaching it to your request tends to produce bids that are easier to compare, because every contractor responds to the same checklist.
Service guides
Service guideHome Energy AuditsA home energy audit connects comfort complaints and utility bills to the measured condition of the house through a blower door test, thermal imaging, duct leakage testing and combustion-safety checks, then delivers written, prioritized recommendations.
Service guideInsulation & Air SealingAir sealing closes the gaps that move air through the attic plane, rim joist and penetrations; insulation slows heat conduction through the assemblies around them.
Service guideWindow & Door ReplacementWindow and door replacement addresses openings with a defined problem: damage, failed seals, poor operation, drafts, single-pane glass in a cold climate, or a door that leaks and does not latch.
Service guideSolar Panel InstallationSolar panel installation covers the roof and shading assessment, equipment selection, electrical and structural permits, utility interconnection and the production and financial assumptions in the proposal.
Free planning tools
Free toolEnergy audit cost calculator: size the assessment before the retrofitSize, material tier and complexity in, a realistic budget range out.
Free toolEnergy retrofit comparisons: the five decisions inside a retrofitSide-by-side tables for the decisions that change the price most.
Free toolEnergy retrofit readiness quiz: do you know the sequence and the tests?10 questions that show what you already know and what to check next.
Free toolEnergy retrofit polls: how other homeowners weighed the same decisionsSee what other planners chose and add your vote.
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