Final answer:
Dwelling units must maintain a temperature of at least 68°F. To convert Fahrenheit to Celsius, use C = (F - 32) × 5/9. A house with a heat loss rate of 200 W/°C needs 4,000 W, and one with 150 W/°C needs 6,000 W to maintain 20°C inside when it's 0°C and -20°C outside respectively.
Step-by-step explanation:
To answer the initial question: Dwelling units shall be provided with heating facilities capable of maintaining a minimum room temperature of 68°F when the winter design temperature in Table R301.2(1) is below 60°F.
To convert temperatures from Fahrenheit to Celsius, the formula to use is C = (F - 32) × 5/9. Applying this formula: 68.0°F in Celsius is (68 - 32) × 5/9, which equals 20°C. Similarly, 78.0°F in Celsius is (78 - 32) × 5/9, which equals 25.6°C.
Regarding the energy conservation and heating efficiency concepts, if we consider a scenario of maintaining an internal temperature of 20°C while the external temperature is 0°C, a house with a heat loss rate of 200 W/°C would need 200 W/°C × 20°C = 4,000 W to maintain the internal temperature. In the case of a house achieving a heat loss rate of 150 W/°C and desiring to keep an inside temperature of 20°C during an outside temperature of -20°C, the heat requirement would be 150 W/°C × 40°C = 6,000 W.