Weatherization ROI Calculator

Weatherization stack returns 10–25% energy savings for $1,500–6,000 typical investment.

Annual energy bill

Total weatherization investment

Energy savings %

Federal credit

State rebate

Payback (years)

3.7

Annual savings

$900

10-year net

$5,700

How the math works

Net = total invest − federal − state. Payback = net / annual savings.

$5,500 − $1,200 − $1,000 = $3,300 net. $3,000 × 30% = $900/yr. Payback 3.7 yrs.

How to Use

Enter annual energy bill.
Enter total weatherization investment.
Enter energy savings %.
Enter federal credit.
Enter state rebate.
Read payback (years).

Frequently Asked Questions

Weatherization stack components?

Air sealing (caulk, foam, door sweeps): $300–1,500, 5–10% energy savings. Attic insulation: $1,200–4,000, 10–20% savings. Wall insulation (blown-in): $1,500–5,000, 5–15%. Weatherstripping doors/windows: $200–800. Duct sealing: $500–1,500, 5–15% savings. Combined stack: $4,000–12,000 invest, 25–40% energy savings. IRA HEEHRA rebate: up to $4,000 for low-income, $2,000 for moderate. Federal 25C: 30% credit up to $1,200 (envelope) + $2,000 heat pump. Paybacks typically 3–8 years stacked.

How accurate is this estimate?

Material and labor estimates are accurate to ±15% with reasonable inputs but local market conditions vary. Major markets cost 30–60% more than rural. Labor rates regional (union vs non-union, prevailing wage). Material prices fluctuate with commodity cycles. Get 3 contractor bids for any work over $5k. This calculator is a sanity check, not a substitute for actual quotes.

DIY vs contractor?

DIY savings: 40–70% of contractor cost on labor. Realistic skill threshold: painting, basic plumbing, simple electrical, drywall, flooring. Pro required: structural, gas, complex electrical, HVAC, roofing (warranty + insurance), permits. Permitted work without license risks insurance and resale. Time: hobby DIYers 3–5x slower than pro. Tools and learning curve real.

Permit and code compliance?

Permits required for: structural changes, additions, electrical service changes, plumbing rough-in, HVAC replacement, roof replacement (varies), fence (varies). Cost: $50–2,000+ depending on scope. Skipping permit risks: stop work order, fines, forced removal, insurance denial, resale title issues. Always pull permit; cost is small relative to compliance friction.