Clients want measurable reduction in drafts and heating/cooling costs with documented before-and-after blower door test results.
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What clients expect and what professionals need to know
Weatherization improves a home's thermal envelope through air sealing of penetrations (caulk and foam at top plates, electrical boxes, plumbing penetrations, attic bypasses) and insulation upgrades. A blower door test quantifies air leakage (measured in ACH50 — air changes per hour at 50 Pascals) before and after weatherization to verify improvement. Typical weatherization reduces ACH50 from 10–20 in older homes to below 5, cutting infiltration losses by 30–50%.
Clients want measurable reduction in drafts and heating/cooling costs with documented before-and-after blower door test results.
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Common questions from clients looking for Weatherization services
A calibrated fan mounted in an exterior door depressurizes the house to 50 Pascals; the fan flow rate measures air leakage in CFM50. Infrared cameras and smoke pencils locate specific leak sites for targeted sealing.
Attic air sealing (top plates, recessed lights, attic hatch) before insulating captures the biggest leakage path; rim joist sealing and penetration sealing are second — together these typically account for 60–80% of a home's air leakage.
Many air-sealing tasks are DIY-accessible (caulking windows, foam at penetrations); a professional audit with a blower door test directs effort to the highest-impact locations, maximizing the return on your work.
Federal Inflation Reduction Act energy efficiency tax credits (up to $1,200/year for insulation and air sealing); many states and utilities offer additional rebates; DOE WAP provides free weatherization for qualifying low-income households.
Very tight homes (below 3 ACH50) need mechanical ventilation (ERV or HRV) to maintain air quality; most existing homes have enough residual leakage. A BPI analyst balances tightness with ventilation needs.
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Practical reading for locals building up their client list.
