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Yes, crawl space insulation is worth it if installed correctly. Installing insulation in your crawl space will improve the air quality, help stabilize your home's temperature, lower your energy bills, and prevent pests from entering your home. Though you’ll pay more to install insulation initially, the savings you get from installing insulation can help offset those initial costs over time.

It’s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat.

Installing sheets of plywood over attic insulation is a popular choice, especially in storage spaces. That said, insulation works by trapping hot air—so it needs extra space to expand and be effective, or you might reduce the energy efficiency of your home. 

It’s important that you never compress the insulation by installing flooring directly on top of it. In many houses, you’ll need to install a subfloor before putting plywood over insulation in your attic.

Insulating your ducts offers several benefits, including:

• Improved energy efficiency: Duct insulation prevents energy losses, reducing heating and cooling costs.

• Cost savings: Lower energy bills make insulation a cost-effective investment.

• Environmental benefits: Enhanced efficiency reduces your carbon footprint.

• Consistent comfort: Insulated ducts help maintain a stable indoor temperature.

• Better indoor air quality: Reduced allergens and pollutants improve air quality.