Installing blown-in insulation delivers measurable cost benefits by improving thermal performance, reducing energy consumption, and minimizing heating and cooling load fluctuations. In both retrofit and new construction scenarios, it offers one of the highest returns on insulation investment relative to installation time and material cost.
Blown-in insulation increases air sealing and fills cavities more uniformly than batts. This reduces conditioned air loss, directly lowering utility bills year-round. Properly installed blown-in insulation in attics can reduce energy costs by up to 20%, depending on regional climate and building envelope condition (U.S. Department of Energy).
Blown-in systems also offer low maintenance, long lifespan, and effective R-value consistency when professionally installed, even in irregular spaces. The following sections provide detailed comparisons, technical specifications, and considerations based on field experience and local climate performance.
| Metric | Blown-In Insulation | Fiberglass Batts | Spray Foam | Cellulose Insulation |
|---|---|---|---|---|
| Average Cost (per sq. ft.) | $1.00 – $1.50 | $0.80 – $1.20 | $2.00 – $3.50 | $0.90 – $1.40 |
| R-Value per Inch | R-2.2 to R-3.8 | R-2.9 to R-3.8 | R-3.5 to R-6.5 | R-3.2 to R-3.8 |
| Air Gap Coverage | High | Moderate | High | High |
| Settling Over Time | Minimal (loose-fill) | None | None | Moderate |
| Moisture Resistance | Moderate | Low | High | Low |
| Average Annual Energy Savings* | 15% – 20% | 10% – 15% | 20% – 25% | 12% – 18% |
*Data estimates for Midwest homes based on EnergyStar modeling and utility audit results.
| Specification | Description |
|---|---|
| Material Types | Cellulose (recycled paper), Fiberglass |
| Installation Method | Blown via machine with hose into cavities or attics |
| Ideal R-Value (Attic IL/IN) | R-49 (16-20 inches average depth) |
| Fire Resistance | Fiberglass: Inherent; Cellulose: Treated with borate |
| Mold Resistance | Moderate (with air sealing and vapor barriers) |
| Life Expectancy | 20-30 years with proper sealing and ventilation |
From field experience, installing baffles before blown-in application ensures proper airflow from soffits and avoids insulation drift—especially important in homes with ridge vent systems.
Cold winters and hot, humid summers create a wide thermal range. Blown-in fiberglass performs well in attics when applied above R-49. Dense-pack cellulose offers sound control benefits and performs reliably in wall cavities of older homes with irregular framing—common in South Chicago housing stock.
Homes with HVAC ducts in the attic benefit disproportionately from attic insulation upgrades. Blown-in insulation limits temperature swings around ducts, boosting system efficiency and lifespan.
Most attic projects under 1,500 sq. ft. are completed in 4-6 hours with proper prep and crew.
Yes, if existing insulation is dry, uncontaminated, and evenly distributed. A full inspection is necessary before adding material.
Loose-fill cellulose may settle slightly. Dense-pack and fiberglass loose-fill settle very little when properly installed.
Infrared imaging and attic depth measurements offer clear indicators. Most homes built before 2000 are under-insulated for today’s efficiency standards.
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Routine attic inspections every 2-3 years help catch moisture or rodent issues early. No active maintenance is required otherwise.
Yes, cellulose provides notable sound dampening when dense-packed in walls or between floors.
Most households see utility savings within the first billing cycle, depending on seasonal usage.
Fiberglass is inert and safe when undisturbed. Cellulose is treated to resist mold and pests, making both options viable in most allergy-sensitive homes.
Upgraded insulation can improve resale value by meeting energy efficiency criteria. It also supports positive home inspection reports.