Exterior doors are more energy efficient if they are constructed with

Exterior doors are more energy efficient if they are constructed with

• A. Solid core
• B. Hollow core
• C. Glass panels
• D. Aluminum skin

Answer: (A)

When evaluating exterior doors for energy efficiency, the key factor is how well the door resists heat transfer and drafts. A solid-core door has a dense interior that adds insulating value and mass, which reduces heat flow and helps maintain stable indoor temperatures when the door is properly sealed. This means less energy is needed for heating in winter and cooling in summer. Hollow-core doors, by contrast, have little insulating material inside, so heat moves through them more easily and they don’t block drafts as effectively. Glass panels can improve aesthetics and lighting, but unless they use high-performance insulated glazing, they create more pathways for heat loss or gain and can reduce overall efficiency. Aluminum skin conducts heat, so a door with metal skin tends to transfer more heat unless substantial insulation is placed behind it and excellent sealing is used. Overall, solid-core construction provides the best combination of insulation and airtightness among these options, making exterior doors more energy efficient.

When evaluating exterior doors for energy efficiency, the key factor is how well the door resists heat transfer and drafts. A solid-core door has a dense interior that adds insulating value and mass, which reduces heat flow and helps maintain stable indoor temperatures when the door is properly sealed. This means less energy is needed for heating in winter and cooling in summer.

Hollow-core doors, by contrast, have little insulating material inside, so heat moves through them more easily and they don’t block drafts as effectively. Glass panels can improve aesthetics and lighting, but unless they use high-performance insulated glazing, they create more pathways for heat loss or gain and can reduce overall efficiency. Aluminum skin conducts heat, so a door with metal skin tends to transfer more heat unless substantial insulation is placed behind it and excellent sealing is used.

Overall, solid-core construction provides the best combination of insulation and airtightness among these options, making exterior doors more energy efficient.