Should a house use high or low specific heat materials to reduce temperature rise in summer, and why?

Should a house use high or low specific heat materials to reduce temperature rise in summer, and why?

• A. Low specific heat materials slow temperature rise by absorbing less heat.
• B. Moderate specific heat materials have no effect.
• C. High specific heat materials slow temperature rise by absorbing more heat per degree rise.
• D. High specific heat materials accelerate temperature rise.

Answer: (C)

The main concept is heat capacity and thermal mass: materials with higher specific heat can absorb more heat per degree of temperature rise. In a house, high specific heat means the material can take in a lot of heat from the sun or ambient air without its temperature climbing much. This slows indoor temperature rise, acting like a thermal sponge that dampens daytime heat. The relationship Q = m c ΔT shows why: for the same amount of heat input (Q), increasing the specific heat (c) lowers the temperature rise (ΔT). So using high specific heat materials—like concrete, brick, stone, or water-filled masses—helps keep interiors cooler during hot days by absorbing heat and releasing it more slowly when temperatures drop. The trade-off is they may retain heat and stay warm longer into the night, but the primary benefit in summer is reducing the peak temperature rise.

The main concept is heat capacity and thermal mass: materials with higher specific heat can absorb more heat per degree of temperature rise. In a house, high specific heat means the material can take in a lot of heat from the sun or ambient air without its temperature climbing much. This slows indoor temperature rise, acting like a thermal sponge that dampens daytime heat. The relationship Q = m c ΔT shows why: for the same amount of heat input (Q), increasing the specific heat (c) lowers the temperature rise (ΔT). So using high specific heat materials—like concrete, brick, stone, or water-filled masses—helps keep interiors cooler during hot days by absorbing heat and releasing it more slowly when temperatures drop. The trade-off is they may retain heat and stay warm longer into the night, but the primary benefit in summer is reducing the peak temperature rise.