DFW home performance: ducts, insulation, air sealing, and IAQ

Start with the symptom, not the product

Write down the rooms, times of day, weather, thermostat settings, odors, visible moisture, dust conditions, and utility pattern that prompted the project. A hot bedroom can come from solar load, missing insulation, an air leak, low supply airflow, poor return airflow, a damaged duct, or several of those at once. The same symptom should not automatically produce the same sale.

Sources: [doe-assessment], [doe-energy-saver]

Why ducts deserve an early test

ENERGY STAR's 20% to 30% figure describes air lost in a typical duct system, not a measured loss for your house. Ducts in a hot attic create a larger opportunity for loss than ducts inside conditioned space. Ask for a documented duct inspection and, when the result will change a major scope, quantitative leakage and airflow testing before deciding between sealing, redesign, or replacement.

Sources: [energy-star-ducts], [doe-duct-research]

Why insulation age alone is not enough

Insulation recommendations and model codes have changed across editions, and DOE says many older homes contain less insulation than homes built today. Existing depth, type, density, coverage, compression, moisture, and air movement all affect performance. A sales representative should document those conditions rather than infer an R-value from the home's age or quote new-construction code as an automatic retrofit requirement.

Sources: [doe-insulation], [basc-insulation], [texas-energy-code]

Use the EPA order for indoor air quality

EPA organizes indoor-air improvement around source control, cleaner outdoor-air ventilation, and filtration or air cleaning. That sequence matters. A filter cannot repair a water leak, vent a combustion appliance, stop pollutant generation, or guarantee relief from a health symptom. Identify the pollutant or condition of concern, correct controllable sources first, then select ventilation and filtration that fit the house and HVAC system.

Sources: [epa-iaq], [epa-filters]

The practical sequence

A defensible project normally moves from baseline evidence to priorities, written scope, installation, and verification. Begin with a home energy assessment when problems span multiple rooms or systems. Address active water, combustion, electrical, structural, pest, and hazardous-material concerns before covering them. Air seal before burying leakage paths under new insulation, preserve safe clearances and attic ventilation, repair ducts, and retest the measurements the project promised to improve.

• 1. Define symptoms and safety concerns
• 2. Capture baseline photos and measurements
• 3. Separate repair, health, comfort, and efficiency goals
• 4. Write materials, quantities, boundaries, and tests into the scope
• 5. Verify the completed work with photos and repeat measurements

Sources: [doe-assessment], [doe-attic-measure], [epa-environment]

Do not let a percentage become a savings guarantee

Government research describes typical conditions and tested strategies across groups of homes. Your savings depend on the measured leakage, insulation condition, equipment, thermostat use, utility rates, weather, and quality of installation. Require the contractor to label modeled savings, utility estimates, and measured results separately. A whole-home assessment should help rank opportunities without pretending it can predict an exact bill.

Sources: [energy-star-ducts], [doe-assessment]

Choose the guide that matches the decision

Use the duct guide for leakage, damage, pressure, and room-airflow questions. Use the attic-insulation guide when depth, coverage, old standards, or heat gain is the concern. Use the air-sealing guide before a major insulation project. Use the indoor-air guide to organize moisture, pollutants, ventilation, and filtration. Use the assessment guide when several issues overlap or when you want an evidence-based sequence instead of separate product quotes.

Sources: [doe-assessment], [epa-iaq]